open videos on popup overlay

2017-02-07 10:34:00 +01:00
parent cc959e62bc
commit 81f67414c8
187 changed files with 17025 additions and 28 deletions
@@ -0,0 +1,119 @@
+<?php
+
+/**
+ * @file
+ * Contains LibrariesAdminWebTest.
+ *
+ * Simpletest automatically discovers test files using PSR-4. We cannot,
+ * however, declare a namespace for this class, as that would require PHP 5.3.
+ * To prepare the PHP 5.3 requirement and the usage of PSR-4 in 7.x-3.x, we
+ * split each test class into its own file and use the correct base name, but
+ * for now use the 'test' extension and register them explicitly in
+ * libraries.info.
+ *
+ * @see simpletest_test_get_all()
+ */
+
+/**
+ * Tests the administrative interface for libraries.
+ */
+class LibrariesAdminWebTest extends LibrariesWebTestBase {
+
+  /**
+   * Provides metadata about this test.
+   *
+   * @return array
+   *   An array of test metadata with the following keys:
+   *   - name: The name of the test.
+   *   - description: The description of the test.
+   *   - group: The group of the test.
+   */
+  public static function getInfo() {
+    return array(
+      'name' => 'Libraries administration',
+      'description' => 'Tests the administrative interface for libraries.',
+      'group' => 'Libraries API',
+    );
+  }
+
+  /**
+   * Tests the libraries report at /admin/reports/libraries.
+   */
+  public function testLibrariesReportOverview() {
+    $this->getWithPermissions(array('access site reports'), 'admin/reports/libraries');
+    $this->assertRaw('Libraries');
+
+    // Make sure that all the libraries are listed.
+    $libraries = libraries_info();
+    $this->assertTrue($libraries);
+    foreach ($libraries as $library) {
+      $this->assertText($library['name']);
+      $this->assertLinkByHref('admin/reports/libraries/' . $library['machine name']);
+    }
+
+    // Make sure that all possible statuses are displayed.
+    $this->assertText('OK');
+    $this->assertText('Not found');
+    $this->assertText('Not detected');
+    $this->assertText('Not supported');
+    $this->assertText('Missing dependency');
+    $this->assertText('Incompatible dependency');
+
+    // Make sure that the providers are displayed.
+    $this->assertRaw('<em class="placeholder">Libraries test module</em> module');
+    $this->assertRaw('<em class="placeholder">Libraries test theme</em> theme');
+    $this->assertRaw('<em class="placeholder">example_info_file.libraries.info</em> info file');
+
+    // Make sure that homepage and download links are displayed.
+    $this->assertLinkByHref('http://example.com');
+    $this->assertLinkByHref('http://example.com/download');
+  }
+
+  /**
+   * Tests the libraries report for an installed library.
+   */
+  public function testLibrariesReportInstalled() {
+    $this->getWithPermissions(array('access site reports'), 'admin/reports/libraries/example_files');
+    $this->assertRaw('Status report for library <em class="placeholder">Example files</em>');
+    $this->assertRaw('The <em class="placeholder">Example files</em> library is installed correctly.');
+    // Check that the information in the status report is displayed.
+    $this->assertText('Example files');
+    $this->assertText('example_files');
+    $this->assertRaw('<em class="placeholder">Libraries test module</em> module');
+    $this->assertText(drupal_get_path('module', 'libraries') . '/tests/libraries/example');
+    $this->assertText('1');
+  }
+
+  /**
+   * Tests the libraries report for a missing library.
+   */
+  public function testLibrariesReportMissing() {
+    $this->getWithPermissions(array('access site reports'), 'admin/reports/libraries/example_missing');
+    $this->assertRaw('Status report for library <em class="placeholder">Example missing</em>');
+    $this->assertRaw('The <em class="placeholder">Example missing</em> library could not be found.');
+    // Check that the download link is being displayed.
+    $this->assertLinkByHref('http://example.com/download');
+  }
+
+
+  /**
+   * Tests the libraries report for a missing library.
+   */
+  public function testLibrariesReportNotDetected() {
+    $this->getWithPermissions(array('access site reports'), 'admin/reports/libraries/example_undetected_version');
+    $this->assertRaw('Status report for library <em class="placeholder">Example undetected version</em>');
+    $this->assertRaw('The version of the <em class="placeholder">Example undetected version</em> library could not be detected.');
+  }
+
+  /**
+   * Tests the libraries report for a missing library.
+   */
+  public function testLibrariesReportNotSupported() {
+    $this->getWithPermissions(array('access site reports'), 'admin/reports/libraries/example_unsupported_version');
+    $this->assertRaw('Status report for library <em class="placeholder">Example unsupported version</em>');
+    $this->assertRaw('The installed version <em class="placeholder">1</em> of the <em class="placeholder">Example unsupported version</em> library is not supported.');
+    // Check that the download link is being displayed.
+    $this->assertLinkByHref('http://example.com/download');
+  }
+
+}
@@ -0,0 +1,543 @@
+<?php
+
+/**
+ * @file
+ * Contains LibrariesLoadWebTest.
+ *
+ * Simpletest automatically discovers test files using PSR-4. We cannot,
+ * however, declare a namespace for this class, as that would require PHP 5.3.
+ * To prepare the PHP 5.3 requirement and the usage of PSR-4 in 7.x-3.x, we
+ * place the test files in the correct directory already, but for now register
+ * them explicitly in libraries.info
+ */
+
+/**
+ * Tests basic detection and loading of libraries.
+ */
+class LibrariesLoadWebTest extends LibrariesWebTestBase {
+
+  /**
+   * Provides metadata about this test.
+   *
+   * @return array
+   *   An array of test metadata with the following keys:
+   *   - name: The name of the test.
+   *   - description: The description of the test.
+   *   - group: The group of the test.
+   */
+  public static function getInfo() {
+    return array(
+      'name' => 'Libraries detection and loading',
+      'description' => 'Tests detection and loading of libraries.',
+      'group' => 'Libraries API',
+    );
+  }
+
+  /**
+   * Tests libraries_detect_dependencies().
+   */
+  public function testLibrariesDetectDependencies() {
+    $library = array(
+      'name' => 'Example',
+      'dependencies' => array('example_missing'),
+    );
+    libraries_detect_dependencies($library);
+    $this->assertEqual($library['error'], 'missing dependency', 'libraries_detect_dependencies() detects missing dependency');
+    $error_message = t('The %dependency library, which the %library library depends on, is not installed.', array(
+      '%dependency' => 'Example missing',
+      '%library' => $library['name'],
+    ));
+    $this->verbose("Expected:<br>$error_message");
+    $this->verbose('Actual:<br>' . $library['error message']);
+    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a missing dependency');
+    // Test versioned dependencies.
+    $version = '1.1';
+    $compatible = array(
+      '1.1',
+      '<=1.1',
+      '>=1.1',
+      '<1.2',
+      '<2.0',
+      '>1.0',
+      '>1.0-rc1',
+      '>1.0-beta2',
+      '>1.0-alpha3',
+      '>0.1',
+      '<1.2, >1.0',
+      '>0.1, <=1.1',
+    );
+    $incompatible = array(
+      '1.2',
+      '2.0',
+      '<1.1',
+      '>1.1',
+      '<=1.0',
+      '<=1.0-rc1',
+      '<=1.0-beta2',
+      '<=1.0-alpha3',
+      '>=1.2',
+      '<1.1, >0.9',
+      '>=0.1, <1.1',
+    );
+    $library = array(
+      'name' => 'Example',
+    );
+    foreach ($compatible as $version_string) {
+      $library['dependencies'][0] = "example_dependency ($version_string)";
+      // libraries_detect_dependencies() is a post-detect callback, so
+      // 'installed' is already set, when it is called. It sets the value to
+      // FALSE for missing or incompatible dependencies.
+      $library['installed'] = TRUE;
+      libraries_detect_dependencies($library);
+      $this->verbose('Library:<pre>' . var_export($library, TRUE) . '</pre>');
+      $this->assertTrue($library['installed'], "libraries_detect_dependencies() detects compatible version string: '$version_string' is compatible with '$version'");
+    }
+    foreach ($incompatible as $version_string) {
+      $library['dependencies'][0] = "example_dependency ($version_string)";
+      $library['installed'] = TRUE;
+      unset($library['error'], $library['error message']);
+      libraries_detect_dependencies($library);
+      $this->verbose('Library:<pre>' . var_export($library, TRUE) . '</pre>');
+      $this->assertEqual($library['error'], 'incompatible dependency', "libraries_detect_dependencies() detects incompatible version strings: '$version_string' is incompatible with '$version'");
+    }
+    // Instead of repeating this assertion for each version string, we just
+    // re-use the $library variable from the foreach loop.
+    $error_message = t('The version %dependency_version of the %dependency library is not compatible with the %library library.', array(
+      '%dependency_version' => $version,
+      '%dependency' => 'Example dependency',
+      '%library' => $library['name'],
+    ));
+    $this->verbose("Expected:<br>$error_message");
+    $this->verbose('Actual:<br>' . $library['error message']);
+    $this->assertEqual($library['error message'], $error_message, 'Correct error message for an incompatible dependency');
+  }
+
+  /**
+   * Tests libraries_scan_info_files().
+   */
+  public function testLibrariesScanInfoFiles() {
+    $expected = array('example_info_file' => (object) array(
+      'uri' => drupal_get_path('module', 'libraries') . '/tests/libraries/example_info_file.libraries.info',
+      'filename' => 'example_info_file.libraries.info',
+      'name' => 'example_info_file.libraries',
+    ));
+    $this->assertEqual(libraries_scan_info_files(), $expected, 'libraries_scan_info_files() correctly finds the example info file.');
+    $this->verbose('<pre>' . var_export(libraries_scan_info_files(), TRUE) . '</pre>');
+  }
+
+  /**
+   * Tests libraries_info().
+   */
+  public function testLibrariesInfo() {
+    // Test that modules can provide and alter library information.
+    $info = libraries_info();
+    $this->assertTrue(isset($info['example_module']));
+    $this->verbose('Library:<pre>' . var_export($info['example_module'], TRUE) . '</pre>');
+    $this->assertEqual($info['example_module']['info type'], 'module');
+    $this->assertEqual($info['example_module']['module'], 'libraries_test_module');
+    $this->assertTrue($info['example_module']['module_altered']);
+
+    // Test that themes can provide and alter library information.
+    $this->assertTrue(isset($info['example_theme']));
+    $this->verbose('Library:<pre>' . var_export($info['example_theme'], TRUE) . '</pre>');
+    $this->assertEqual($info['example_theme']['info type'], 'theme');
+    $this->assertEqual($info['example_theme']['theme'], 'libraries_test_theme');
+    $this->assertTrue($info['example_theme']['theme_altered']);
+
+    // Test that library information is found correctly.
+    $expected = array(
+      'name' => 'Example files',
+      'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+      'version' => '1',
+      'files' => array(
+        'js' => array('example_1.js' => array()),
+        'css' => array('example_1.css' => array()),
+        'php' => array('example_1.php' => array()),
+      ),
+      'info type' => 'module',
+      'module' => 'libraries_test_module',
+    );
+    libraries_info_defaults($expected, 'example_files');
+    $library = libraries_info('example_files');
+    $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
+    $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library, $expected, 'Library information is correctly gathered.');
+
+    // Test a library specified with an .info file gets detected.
+    $expected = array(
+      'name' => 'Example info file',
+      'info type' => 'info file',
+      'info file' => drupal_get_path('module', 'libraries') . '/tests/libraries/example_info_file.libraries.info',
+    );
+    libraries_info_defaults($expected, 'example_info_file');
+    $library = libraries_info('example_info_file');
+    // If this module was downloaded from Drupal.org, the Drupal.org packaging
+    // system has corrupted the test info file.
+    // @see http://drupal.org/node/1606606
+    unset($library['core'], $library['datestamp'], $library['project'], $library['version']);
+    $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
+    $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library, $expected, 'Library specified with an .info file found');
+  }
+
+  /**
+   * Tests libraries_detect().
+   */
+  public function testLibrariesDetect() {
+    // Test missing library.
+    $library = libraries_detect('example_missing');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['error'], 'not found', 'Missing library not found.');
+    $error_message = t('The %library library could not be found.', array(
+      '%library' => $library['name'],
+    ));
+    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a missing library.');
+
+    // Test unknown library version.
+    $library = libraries_detect('example_undetected_version');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['error'], 'not detected', 'Undetected version detected as such.');
+    $error_message = t('The version of the %library library could not be detected.', array(
+      '%library' => $library['name'],
+    ));
+    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a library with an undetected version.');
+
+    // Test unsupported library version.
+    $library = libraries_detect('example_unsupported_version');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['error'], 'not supported', 'Unsupported version detected as such.');
+    $error_message = t('The installed version %version of the %library library is not supported.', array(
+      '%version' => $library['version'],
+      '%library' => $library['name'],
+    ));
+    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a library with an unsupported version.');
+
+    // Test supported library version.
+    $library = libraries_detect('example_supported_version');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['installed'], TRUE, 'Supported library version found.');
+
+    // Test libraries_get_version().
+    $library = libraries_detect('example_default_version_callback');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['version'], '1', 'Expected version returned by default version callback.');
+
+    // Test a multiple-parameter version callback.
+    $library = libraries_detect('example_multiple_parameter_version_callback');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['version'], '1', 'Expected version returned by multiple parameter version callback.');
+
+    // Test a top-level files property.
+    $library = libraries_detect('example_files');
+    $files = array(
+      'js' => array('example_1.js' => array()),
+      'css' => array('example_1.css' => array()),
+      'php' => array('example_1.php' => array()),
+    );
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['files'], $files, 'Top-level files property works.');
+
+    // Test version-specific library files.
+    $library = libraries_detect('example_versions');
+    $files = array(
+      'js' => array('example_2.js' => array()),
+      'css' => array('example_2.css' => array()),
+      'php' => array('example_2.php' => array()),
+    );
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['files'], $files, 'Version-specific library files found.');
+
+    // Test missing variant.
+    $library = libraries_detect('example_variant_missing');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['variants']['example_variant']['error'], 'not found', 'Missing variant not found');
+    $error_message = t('The %variant variant of the %library library could not be found.', array(
+      '%variant' => 'example_variant',
+      '%library' => 'Example variant missing',
+    ));
+    $this->assertEqual($library['variants']['example_variant']['error message'], $error_message, 'Correct error message for a missing variant.');
+
+    // Test existing variant.
+    $library = libraries_detect('example_variant');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['variants']['example_variant']['installed'], TRUE, 'Existing variant found.');
+  }
+
+  /**
+   * Tests libraries_detect() without a $name parameter.
+   */
+  public function testLibrariesDetectAll() {
+    // Test that an array with all library information is returned and that the
+    // libraries are properly detected.
+    $libraries = libraries_detect();
+    $this->verbose('<pre>' . var_export($libraries, TRUE) . '</pre>');
+    $this->assertEqual($libraries['example_missing']['error'], 'not found');
+    $this->assertEqual($libraries['example_undetected_version']['error'], 'not detected');
+    $this->assertEqual($libraries['example_unsupported_version']['error'], 'not supported');
+    $this->assertEqual($libraries['example_supported_version']['installed'], TRUE);
+  }
+
+  /**
+   * Tests libraries_load().
+   */
+  public function testLibrariesLoad() {
+    // Test dependencies.
+    $library = libraries_load('example_dependency_missing');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertFalse($library['loaded'], 'Library with missing dependency cannot be loaded');
+    $library = libraries_load('example_dependency_incompatible');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertFalse($library['loaded'], 'Library with incompatible dependency cannot be loaded');
+    $library = libraries_load('example_dependency_compatible');
+    $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library['loaded'], 1, 'Library with compatible dependency is loaded');
+    $loaded = &drupal_static('libraries_load');
+    $this->verbose('<pre>' . var_export($loaded, TRUE) . '</pre>');
+    $this->assertEqual($loaded['example_dependency']['loaded'], 1, 'Dependency library is also loaded');
+
+    // Test that PHP files that have a local $path variable do not break library
+    // loading.
+    // @see _libraries_require_once()
+    $library = libraries_load('example_path_variable_override');
+    $this->assertEqual($library['loaded'], 2, 'PHP files cannot break library loading.');
+  }
+
+  /**
+   * Tests the applying of callbacks.
+   */
+  public function testCallbacks() {
+    $expected = array(
+      'name' => 'Example callback',
+      'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+      'version' => '1',
+      'versions' => array(
+        '1' => array(
+          'variants' => array(
+            'example_variant' => array(
+              'info callback' => 'not applied',
+              'pre-detect callback' => 'not applied',
+              'post-detect callback' => 'not applied',
+              'pre-dependencies-load callback' => 'not applied',
+              'pre-load callback' => 'not applied',
+              'post-load callback' => 'not applied',
+            ),
+          ),
+          'info callback' => 'not applied',
+          'pre-detect callback' => 'not applied',
+          'post-detect callback' => 'not applied',
+          'pre-dependencies-load callback' => 'not applied',
+          'pre-load callback' => 'not applied',
+          'post-load callback' => 'not applied',
+        ),
+      ),
+      'variants' => array(
+        'example_variant' => array(
+          'info callback' => 'not applied',
+          'pre-detect callback' => 'not applied',
+          'post-detect callback' => 'not applied',
+          'pre-dependencies-load callback' => 'not applied',
+          'pre-load callback' => 'not applied',
+          'post-load callback' => 'not applied',
+        ),
+      ),
+      'callbacks' => array(
+        'info' => array('_libraries_test_module_info_callback'),
+        'pre-detect' => array('_libraries_test_module_pre_detect_callback'),
+        'post-detect' => array('_libraries_test_module_post_detect_callback'),
+        'pre-dependencies-load' => array('_libraries_test_module_pre_dependencies_load_callback'),
+        'pre-load' => array('_libraries_test_module_pre_load_callback'),
+        'post-load' => array('_libraries_test_module_post_load_callback'),
+      ),
+      'info callback' => 'not applied',
+      'pre-detect callback' => 'not applied',
+      'post-detect callback' => 'not applied',
+      'pre-dependencies-load callback' => 'not applied',
+      'pre-load callback' => 'not applied',
+      'post-load callback' => 'not applied',
+      'info type' => 'module',
+      'module' => 'libraries_test_module',
+    );
+    libraries_info_defaults($expected, 'example_callback');
+
+    // Test a callback in the 'info' group.
+    $expected['info callback'] = 'applied (top-level)';
+    $expected['versions']['1']['info callback'] = 'applied (version 1)';
+    $expected['versions']['1']['variants']['example_variant']['info callback'] = 'applied (version 1, variant example_variant)';
+    $expected['variants']['example_variant']['info callback'] = 'applied (variant example_variant)';
+    $library = libraries_info('example_callback');
+    $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
+    $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library, $expected, 'Prepare callback was applied correctly.');
+
+    // Test a callback in the 'pre-detect' and 'post-detect' phases.
+    // Successfully detected libraries should only contain version information
+    // for the detected version and thus, be marked as installed.
+    unset($expected['versions']);
+    $expected['installed'] = TRUE;
+    // Additionally, version-specific properties of the detected version are
+    // supposed to override the corresponding top-level properties.
+    $expected['info callback'] = 'applied (version 1)';
+    $expected['variants']['example_variant']['installed'] = TRUE;
+    $expected['variants']['example_variant']['info callback'] = 'applied (version 1, variant example_variant)';
+    // Version-overloading takes place after the 'pre-detect' callbacks have
+    // been applied.
+    $expected['pre-detect callback'] = 'applied (version 1)';
+    $expected['post-detect callback'] = 'applied (top-level)';
+    $expected['variants']['example_variant']['pre-detect callback'] = 'applied (version 1, variant example_variant)';
+    $expected['variants']['example_variant']['post-detect callback'] = 'applied (variant example_variant)';
+    $library = libraries_detect('example_callback');
+    $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
+    $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library, $expected, 'Detect callback was applied correctly.');
+
+    // Test a callback in the 'pre-dependencies-load', 'pre-load' and
+    // 'post-load' phases.
+    // Successfully loaded libraries should only contain information about the
+    // already loaded variant.
+    unset($expected['variants']);
+    $expected['loaded'] = 0;
+    $expected['pre-dependencies-load callback'] = 'applied (top-level)';
+    $expected['pre-load callback'] = 'applied (top-level)';
+    $expected['post-load callback'] = 'applied (top-level)';
+    $library = libraries_load('example_callback');
+    $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
+    $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library, $expected, 'Pre-load and post-load callbacks were applied correctly.');
+    // This is not recommended usually and is only used for testing purposes.
+    drupal_static_reset('libraries_load');
+    // Successfully loaded library variants are supposed to contain the specific
+    // variant information only.
+    $expected['info callback'] = 'applied (version 1, variant example_variant)';
+    $expected['pre-detect callback'] = 'applied (version 1, variant example_variant)';
+    $expected['post-detect callback'] = 'applied (variant example_variant)';
+    $library = libraries_load('example_callback', 'example_variant');
+    $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
+    $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
+    $this->assertEqual($library, $expected, 'Pre-detect and post-detect callbacks were applied correctly to a variant.');
+  }
+
+  /**
+   * Tests that library files are properly added to the page output.
+   *
+   * We check for JavaScript and CSS files directly in the DOM and add a list of
+   * included PHP files manually to the page output.
+   *
+   * @see _libraries_test_module_load()
+   */
+  public function testLibrariesOutput() {
+    // Test loading of a simple library with a top-level files property.
+    $this->drupalGet('libraries-test-module/files');
+    $this->assertLibraryFiles('example_1', 'File loading');
+
+    // Test loading of integration files.
+    $this->drupalGet('libraries-test-module/module-integration-files');
+    $this->assertRaw('libraries_test_module.js', 'Integration file loading: libraries_test_module.js found');
+    $this->assertRaw('libraries_test_module.css', 'Integration file loading: libraries_test_module.css found');
+    $this->assertRaw('libraries_test_module.inc', 'Integration file loading: libraries_test_module.inc found');
+    $this->drupalGet('libraries-test-module/theme-integration-files');
+    $this->assertRaw('libraries_test_theme.js', 'Integration file loading: libraries_test_theme.js found');
+    $this->assertRaw('libraries_test_theme.css', 'Integration file loading: libraries_test_theme.css found');
+    $this->assertRaw('libraries_test_theme.inc', 'Integration file loading: libraries_test_theme.inc found');
+
+    // Test loading of post-load integration files.
+    $this->drupalGet('libraries-test-module/module-integration-files-post-load');
+    // If the files were not loaded correctly, a fatal error occurs.
+    $this->assertResponse(200, 'Post-load integration files are loaded correctly.');
+
+    // Test version overloading.
+    $this->drupalGet('libraries-test-module/versions');
+    $this->assertLibraryFiles('example_2', 'Version overloading');
+
+    // Test variant loading.
+    $this->drupalGet('libraries-test-module/variant');
+    $this->assertLibraryFiles('example_3', 'Variant loading');
+
+    // Test version overloading and variant loading.
+    $this->drupalGet('libraries-test-module/versions-and-variants');
+    $this->assertLibraryFiles('example_4', 'Concurrent version and variant overloading');
+
+    // Test caching.
+    variable_set('libraries_test_module_cache', TRUE);
+    cache_clear_all('example_callback', 'cache_libraries');
+    // When the library information is not cached, all callback groups should be
+    // invoked.
+    $this->drupalGet('libraries-test-module/cache');
+    $this->assertRaw('The <em>info</em> callback group was invoked.', 'Info callback invoked for uncached libraries.');
+    $this->assertRaw('The <em>pre-detect</em> callback group was invoked.', 'Pre-detect callback invoked for uncached libraries.');
+    $this->assertRaw('The <em>post-detect</em> callback group was invoked.', 'Post-detect callback invoked for uncached libraries.');
+    $this->assertRaw('The <em>pre-load</em> callback group was invoked.', 'Pre-load callback invoked for uncached libraries.');
+    $this->assertRaw('The <em>post-load</em> callback group was invoked.', 'Post-load callback invoked for uncached libraries.');
+    // When the library information is cached only the 'pre-load' and
+    // 'post-load' callback groups should be invoked.
+    $this->drupalGet('libraries-test-module/cache');
+    $this->assertNoRaw('The <em>info</em> callback group was not invoked.', 'Info callback not invoked for cached libraries.');
+    $this->assertNoRaw('The <em>pre-detect</em> callback group was not invoked.', 'Pre-detect callback not invoked for cached libraries.');
+    $this->assertNoRaw('The <em>post-detect</em> callback group was not invoked.', 'Post-detect callback not invoked for cached libraries.');
+    $this->assertRaw('The <em>pre-load</em> callback group was invoked.', 'Pre-load callback invoked for cached libraries.');
+    $this->assertRaw('The <em>post-load</em> callback group was invoked.', 'Post-load callback invoked for cached libraries.');
+    variable_set('libraries_test_module_cache', FALSE);
+  }
+
+  /**
+   * Helper function to assert that a library was correctly loaded.
+   *
+   * Asserts that all the correct files were loaded and all the incorrect ones
+   * were not.
+   *
+   * @param $name
+   *   The name of the files that should be loaded. The current testing system
+   *   knows of 'example_1', 'example_2', 'example_3' and 'example_4'. Each name
+   *   has an associated JavaScript, CSS and PHP file that will be asserted. All
+   *   other files will be asserted to not be loaded. See
+   *   tests/example/README.txt for more information on how the loading of the
+   *   files is tested.
+   * @param $label
+   *   (optional) A label to prepend to the assertion messages, to make them
+   *   less ambiguous.
+   * @param $extensions
+   *   (optional) The expected file extensions of $name. Defaults to
+   *   array('js', 'css', 'php').
+   */
+  public function assertLibraryFiles($name, $label = '', $extensions = array('js', 'css', 'php')) {
+    $label = ($label !== '' ? "$label: " : '');
+
+    // Test that the wrong files are not loaded...
+    $names = array(
+      'example_1' => FALSE,
+      'example_2' => FALSE,
+      'example_3' => FALSE,
+      'example_4' => FALSE,
+    );
+    // ...and the correct ones are.
+    $names[$name] = TRUE;
+
+    // Test for the specific HTML that the different file types appear as in the
+    // DOM.
+    $html = array(
+      'js' => array('<script type="text/javascript" src="', '"></script>'),
+      'css' => array('@import url("', '");'),
+      // PHP files do not get added to the DOM directly.
+      // @see _libraries_test_load()
+      'php' => array('<li>', '</li>'),
+    );
+
+    foreach ($names as $name => $expected) {
+      foreach ($extensions as $extension) {
+        $filepath = drupal_get_path('module', 'libraries') . "/tests/libraries/example/$name.$extension";
+        // JavaScript and CSS files appear as full URLs and with an appended
+        // query string.
+        if (in_array($extension, array('js', 'css'))) {
+          $filepath = url('', array('absolute' => TRUE)) . $filepath . '?' . variable_get('css_js_query_string');
+        }
+        $raw = $html[$extension][0] . $filepath . $html[$extension][1];
+        if ($expected) {
+          $this->assertRaw($raw, "$label$name.$extension found.");
+        }
+        else {
+          $this->assertNoRaw($raw, "$label$name.$extension not found.");
+        }
+      }
+    }
+  }
+
+}
@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * @file
+ * Contains LibrariesUnitTest.
+ *
+ * Simpletest automatically discovers test files using PSR-4. We cannot,
+ * however, declare a namespace for this class, as that would require PHP 5.3.
+ * To prepare the PHP 5.3 requirement and the usage of PSR-4 in 7.x-3.x, we
+ * place the test files in the correct directory already, but for now register
+ * them explicitly in libraries.info.
+ */
+
+/**
+ * Tests basic Libraries API functions.
+ */
+class LibrariesUnitTest extends DrupalUnitTestCase {
+
+  /**
+   * Provides metadata about this test.
+   *
+   * @return array
+   *   An array of test metadata with the following keys:
+   *   - name: The name of the test.
+   *   - description: The description of the test.
+   *   - group: The group of the test.
+   */
+  public static function getInfo() {
+    return array(
+      'name' => 'Libraries API unit tests',
+      'description' => 'Tests basic functions provided by Libraries API.',
+      'group' => 'Libraries API',
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    drupal_load('module', 'libraries');
+    parent::setUp();
+  }
+
+  /**
+   * Tests libraries_get_path().
+   */
+  public function testLibrariesGetPath() {
+    // Note that, even though libraries_get_path() doesn't find the 'example'
+    // library, we are able to make it 'installed' by specifying the 'library
+    // path' up-front. This is only used for testing purposed and is strongly
+    // discouraged as it defeats the purpose of Libraries API in the first
+    // place.
+    $this->assertEqual(libraries_get_path('example'), FALSE, 'libraries_get_path() returns FALSE for a missing library.');
+  }
+
+  /**
+   * Tests libraries_prepare_files().
+   */
+  public function testLibrariesPrepareFiles() {
+    $expected = array(
+      'files' => array(
+        'js' => array('example.js' => array()),
+        'css' => array('example.css' => array()),
+        'php' => array('example.php' => array()),
+      ),
+    );
+    $library = array(
+      'files' => array(
+        'js' => array('example.js'),
+        'css' => array('example.css'),
+        'php' => array('example.php'),
+      ),
+    );
+    libraries_prepare_files($library, NULL, NULL);
+    $this->assertEqual($expected, $library, 'libraries_prepare_files() works correctly.');
+  }
+
+}
@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * @file
+ * Contains LibrariesWebTestBase.
+ *
+ * Simpletest automatically discovers test files using PSR-4. We cannot,
+ * however, declare a namespace for this class, as that would require PHP 5.3.
+ * To prepare the PHP 5.3 requirement and the usage of PSR-4 in 7.x-3.x, we
+ * place the test files in the correct directory already, but for now register
+ * them explicitly in libraries.info
+ */
+
+/**
+ * Base class for Libraries API web tests.
+ */
+abstract class LibrariesWebTestBase extends DrupalWebTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $profile = 'testing';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp('libraries', 'libraries_test_module');
+    theme_enable(array('libraries_test_theme'));
+  }
+
+  /**
+   * Retrieves a path making sure a set of permissions is required to access it.
+   *
+   * After calling this method, a user with the given permissions is logged in
+   * and the retrieved page is loaded into the internal browser.
+   *
+   * @param array $permissions
+   *   An array of permission names to assign to user. Note that the user always
+   *   has the default permissions derived from the "authenticated users" role.
+   * @param string $path
+   *   Drupal path or URL to load into the internal browser.
+   * @param array $options
+   *   Options to be forwarded to url().
+   * @param array $headers
+   *   An array containing additional HTTP request headers, each formatted as
+   *   "name: value".
+   *
+   * @return string
+   *   The retrieved HTML string, also available as $this->drupalGetContent().
+   *
+   * @see \DrupalWebTestCase::drupalGet()
+   * @see \DrupalWebTestCase::drupalCreateUser()
+   */
+  protected function getWithPermissions(array $permissions, $path, array $options = array(), array $headers = array()) {
+    $this->drupalGet($path, $options, $headers);
+    $this->assertResponse(403);
+
+    $this->drupalLogin($this->drupalCreateUser($permissions));
+    $this->drupalGet($path, $options, $headers);
+    $this->assertResponse(200);
+  }
+
+}
@@ -0,0 +1,43 @@
+
+Example library
+
+Version 1
+
+This file is an example file to test version detection.
+
+The various other files in this directory are to test the loading of JavaScript,
+CSS and PHP files.
+- JavaScript: The filenames of the JavaScript files are asserted to be in the
+  raw HTML via SimpleTest. Since the filename could appear, for instance, in an
+  error message, this is not very robust. Explicit testing of JavaScript,
+  though, is not yet possible with SimpleTest. To allow for easier debugging, we
+  place the following text on the page:
+  "If this text shows up, no JavaScript test file was loaded."
+  This text is replaced via JavaScript by a text of the form:
+  "If this text shows up, [file] was loaded successfully."
+  [file] is either 'example_1.js', 'example_2.js', 'example_3.js',
+  'example_4.js' or 'libraries_test_module.js'. If you have SimpleTest's verbose
+  mode enabled and see the above text in one of the debug pages, the noted
+  JavaScript file was loaded successfully.
+- CSS: The filenames of the CSS files are asserted to be in the raw HTML via
+  SimpleTest. Since the filename could appear, for instance, in an error
+  message, this is not very robust. Explicit testing of CSS, though, is not yet
+  possible with SimpleTest. Hence, the CSS files, if loaded, make the following
+  text a certain color:
+  "If one of the CSS test files has been loaded, this text will be colored:
+  - example_1: red
+  - example_2: green
+  - example_3: orange
+  - example_4: blue
+  - libraries_test_module: purple"
+  If you have SimpleTest's verbose mode enabled, and see the above text in a
+  certain color (i.e. not in black), a CSS file was loaded successfully. Which
+  file depends on the color as referenced in the text above.
+- PHP: The loading of PHP files is tested by defining a dummy function in the
+  PHP files and then checking whether this function was defined using
+  function_exists(). This can be checked programatically with SimpleTest.
+The loading of integration files is tested with the same method. The integration
+files are libraries_test_module.js, libraries_test_module.css,
+libraries_test_module.inc and are located in the test module's directory
+alongside libraries_test_module.info (i.e. they are not in the same directory as
+this file).
@@ -0,0 +1,12 @@
+
+/**
+ * @file
+ * Test CSS file for Libraries loading.
+ *
+ * Color the 'libraries-test-module-css' div red. See README.txt for more
+ * information.
+ */
+
+.libraries-test-module-css {
+  color: red;
+}
@@ -0,0 +1,18 @@
+
+/**
+ * @file
+ * Test JavaScript file for Libraries loading.
+ *
+ * Replace the text in the 'libraries-test-module-js' div. See README.txt for
+ * more information.
+ */
+
+(function ($) {
+
+Drupal.behaviors.librariesTest = {
+  attach: function(context, settings) {
+    $('.libraries-test-module-js').text('If this text shows up, example_1.js was loaded successfully.')
+  }
+};
+
+})(jQuery);
@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * @file
+ * Test PHP file for Libraries loading.
+ */
+
+// @see _libraries_require_once()
+$path = 'abc';
+
+/**
+ * Dummy function to see if this file was loaded.
+ */
+function _libraries_test_module_example_1() {
+}
@@ -0,0 +1,12 @@
+
+/**
+ * @file
+ * Test CSS file for Libraries loading.
+ *
+ * Color the 'libraries-test-module-css' div green. See README.txt for more
+ * information.
+ */
+
+.libraries-test-module-css {
+  color: green;
+}
@@ -0,0 +1,18 @@
+
+/**
+ * @file
+ * Test JavaScript file for Libraries loading.
+ *
+ * Replace the text in the 'libraries-test-module-js' div. See README.txt for
+ * more information.
+ */
+
+(function ($) {
+
+Drupal.behaviors.librariesTest = {
+  attach: function(context, settings) {
+    $('.libraries-test-module-js').text('If this text shows up, example_2.js was loaded successfully.')
+  }
+};
+
+})(jQuery);
@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * @file
+ * Test PHP file for Libraries loading.
+ */
+
+// @see _libraries_require_once()
+$path = 'abc';
+
+/**
+ * Dummy function to see if this file was loaded.
+ */
+function _libraries_test_module_example_2() {
+}
@@ -0,0 +1,12 @@
+
+/**
+ * @file
+ * Test CSS file for Libraries loading.
+ *
+ * Color the 'libraries-test-module-css' div orange. See README.txt for more
+ * information.
+ */
+
+.libraries-test-module-css {
+  color: orange;
+}
@@ -0,0 +1,18 @@
+
+/**
+ * @file
+ * Test JavaScript file for Libraries loading.
+ *
+ * Replace the text in the 'libraries-test-module-js' div. See README.txt for
+ * more information.
+ */
+
+(function ($) {
+
+Drupal.behaviors.librariesTest = {
+  attach: function(context, settings) {
+    $('.libraries-test-module-js').text('If this text shows up, example_3.js was loaded successfully.')
+  }
+};
+
+})(jQuery);
@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * @file
+ * Test PHP file for Libraries loading.
+ */
+
+/**
+ * Dummy function to see if this file was loaded.
+ */
+function _libraries_test_module_example_3() {
+}
@@ -0,0 +1,12 @@
+
+/**
+ * @file
+ * Test CSS file for Libraries loading.
+ *
+ * Color the 'libraries-test-module-css' div blue. See README.txt for more
+ * information.
+ */
+
+.libraries-test-module-css {
+  color: blue;
+}
@@ -0,0 +1,18 @@
+
+/**
+ * @file
+ * Test JavaScript file for Libraries loading.
+ *
+ * Replace the text in the 'libraries-test-module-js' div. See README.txt for
+ * more information.
+ */
+
+(function ($) {
+
+Drupal.behaviors.librariesTest = {
+  attach: function(context, settings) {
+    $('.libraries-test-module-js').text('If this text shows up, example_4.js was loaded successfully.')
+  }
+};
+
+})(jQuery);
@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * @file
+ * Test PHP file for Libraries loading.
+ */
+
+/**
+ * Dummy function to see if this file was loaded.
+ */
+function _libraries_test_module_example_4() {
+}
@@ -0,0 +1,10 @@
+; This is an example info file of a library used for testing purposes.
+name = Example info file
+
+
+; Information added by Drupal.org packaging script on 2016-05-12
+version = "7.x-2.3"
+core = "7.x"
+project = "libraries"
+datestamp = "1463077450"
+
@@ -0,0 +1,12 @@
+
+/**
+ * @file
+ * Test CSS file for Libraries loading.
+ *
+ * Color the 'libraries-test-module-css' div purple. See README.txt for more
+ * information.
+ */
+
+.libraries-test-module-css {
+  color: purple;
+}
@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * @file
+ * Test PHP file for Libraries loading.
+
+/**
+ * Dummy function to see if this file was loaded.
+ */
+function _libraries_test_module_integration_file() {
+}
@@ -0,0 +1,13 @@
+name = Libraries test module
+description = Tests library detection and loading.
+core = 7.x
+package = Testing
+dependencies[] = libraries
+hidden = TRUE
+
+; Information added by Drupal.org packaging script on 2016-05-12
+version = "7.x-2.3"
+core = "7.x"
+project = "libraries"
+datestamp = "1463077450"
+
@@ -0,0 +1,18 @@
+
+/**
+ * @file
+ * Test JavaScript file for Libraries loading.
+ *
+ * Replace the text in the 'libraries-test-module-js' div. See README.txt for
+ * more information.
+ */
+
+(function ($) {
+
+Drupal.behaviors.librariesTest = {
+  attach: function(context, settings) {
+    $('.libraries-test-module-js').text('If this text shows up, libraries_test_module.js was loaded successfully.')
+  }
+};
+
+})(jQuery);
@@ -0,0 +1,631 @@
+<?php
+
+/**
+ * @file
+ * Tests the library detection and loading.
+ */
+
+/**
+ * Implements hook_libraries_info().
+ */
+function libraries_test_module_libraries_info() {
+  // Test library information gathering.
+  $libraries['example_module'] = array(
+    'name' => 'Example module',
+    'module_altered' => FALSE,
+  );
+
+  // Test library detection.
+  $libraries['example_missing'] = array(
+    'name' => 'Example missing',
+    // Provide a vendor and download URL to test that the UI links to it.
+    'vendor url' => 'http://example.com',
+    'download url' => 'http://example.com/download',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/missing',
+  );
+  $libraries['example_undetected_version'] = array(
+    'name' => 'Example undetected version',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version callback' => '_libraries_test_module_return_version',
+    'version arguments' => array(FALSE),
+  );
+  $libraries['example_unsupported_version'] = array(
+    'name' => 'Example unsupported version',
+    // Provide a download URL to test that the UI links to it.
+    'download url' => 'http://example.com/download',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version callback' => '_libraries_test_module_return_version',
+    'version arguments' => array('1'),
+    'versions' => array(
+      '2' => array(),
+    ),
+  );
+  $libraries['example_supported_version'] = array(
+    'name' => 'Example supported version',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version callback' => '_libraries_test_module_return_version',
+    'version arguments' => array('1'),
+    'versions' => array(
+      '1' => array(),
+    ),
+  );
+
+  // Test the default version callback.
+  $libraries['example_default_version_callback'] = array(
+    'name' => 'Example default version callback',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version arguments' => array(
+      'file' => 'README.txt',
+      // Version 1
+      'pattern' => '/Version (\d+)/',
+      'lines' => 5,
+    ),
+  );
+
+  // Test a multiple-parameter version callback.
+  $libraries['example_multiple_parameter_version_callback'] = array(
+    'name' => 'Example multiple parameter version callback',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    // Version 1
+    'version callback' => '_libraries_test_module_get_version',
+    'version arguments' => array('README.txt', '/Version (\d+)/', 5),
+  );
+
+  // Test a top-level files property.
+  $libraries['example_files'] = array(
+    'name' => 'Example files',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'files' => array(
+      'js' => array('example_1.js'),
+      'css' => array('example_1.css'),
+      'php' => array('example_1.php'),
+    ),
+  );
+
+  // Test loading of integration files.
+  // Normally added by the corresponding module via hook_libraries_info_alter(),
+  // these files should be automatically loaded when the library is loaded.
+  $libraries['example_module_integration_files'] = array(
+    'name' => 'Example module integration files',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'integration files' => array(
+      'libraries_test_module' => array(
+        'js' => array('libraries_test_module.js'),
+        'css' => array('libraries_test_module.css'),
+        'php' => array('libraries_test_module.inc'),
+      ),
+    ),
+  );
+
+  // Test loading of integration files after library files.
+  // We test the correct loading order by calling a function that is defined in
+  // example_1.php in libraries_test_module_post_load.inc.
+  $libraries['example_module_integration_files_post_load'] = array(
+    'name' => 'Example module post-load integration files',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'files' => array(
+      'php' => array('example_1.php'),
+    ),
+    'integration files' => array(
+      'libraries_test_module' => array(
+        'php' => array('libraries_test_module_post_load.inc'),
+      ),
+    ),
+    'post-load integration files' => TRUE,
+  );
+
+  // Test version overloading.
+  $libraries['example_versions'] = array(
+    'name' => 'Example versions',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '2',
+    'versions' => array(
+      '1' => array(
+        'files' => array(
+          'js' => array('example_1.js'),
+          'css' => array('example_1.css'),
+          'php' => array('example_1.php'),
+        ),
+      ),
+      '2' => array(
+        'files' => array(
+          'js' => array('example_2.js'),
+          'css' => array('example_2.css'),
+          'php' => array('example_2.php'),
+        ),
+      ),
+    ),
+  );
+
+  // Test variant detection.
+  $libraries['example_variant_missing'] = array(
+    'name' => 'Example variant missing',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'variants' => array(
+      'example_variant' => array(
+        'files' => array(
+          'js' => array('example_3.js'),
+          'css' => array('example_3.css'),
+          'php' => array('example_3.php'),
+        ),
+        'variant callback' => '_libraries_test_module_return_installed',
+        'variant arguments' => array(FALSE),
+      ),
+    ),
+  );
+
+  $libraries['example_variant'] = array(
+    'name' => 'Example variant',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'variants' => array(
+      'example_variant' => array(
+        'files' => array(
+          'js' => array('example_3.js'),
+          'css' => array('example_3.css'),
+          'php' => array('example_3.php'),
+        ),
+        'variant callback' => '_libraries_test_module_return_installed',
+        'variant arguments' => array(TRUE),
+      ),
+    ),
+  );
+
+  // Test correct behaviour with multiple versions and multiple variants.
+  $libraries['example_versions_and_variants'] = array(
+    'name' => 'Example versions and variants',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '2',
+    'versions' => array(
+      '1' => array(
+        'variants' => array(
+          'example_variant_1' => array(
+            'files' => array(
+              'js' => array('example_1.js'),
+              'css' => array('example_1.css'),
+              'php' => array('example_1.php'),
+            ),
+            'variant callback' => '_libraries_test_module_return_installed',
+            'variant arguments' => array(TRUE),
+          ),
+          'example_variant_2' => array(
+            'files' => array(
+              'js' => array('example_2.js'),
+              'css' => array('example_2.css'),
+              'php' => array('example_2.php'),
+            ),
+            'variant callback' => '_libraries_test_module_return_installed',
+            'variant arguments' => array(TRUE),
+          ),
+        ),
+      ),
+      '2' => array(
+        'variants' => array(
+          'example_variant_1' => array(
+            'files' => array(
+              'js' => array('example_3.js'),
+              'css' => array('example_3.css'),
+              'php' => array('example_3.php'),
+            ),
+            'variant callback' => '_libraries_test_module_return_installed',
+            'variant arguments' => array(TRUE),
+          ),
+          'example_variant_2' => array(
+            'files' => array(
+              'js' => array('example_4.js'),
+              'css' => array('example_4.css'),
+              'php' => array('example_4.php'),
+            ),
+            'variant callback' => '_libraries_test_module_return_installed',
+            'variant arguments' => array(TRUE),
+          ),
+        ),
+      ),
+    ),
+  );
+
+  // Test dependency loading.
+  // We add one file to each library to be able to verify if it was loaded with
+  // libraries_load().
+  // This library acts as a dependency for the libraries below.
+  $libraries['example_dependency'] = array(
+    'name' => 'Example dependency',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1.1',
+    'files' => array('js' => array('example_1.js')),
+  );
+  $libraries['example_dependency_missing'] = array(
+    'name' => 'Example dependency missing',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'dependencies' => array('example_missing'),
+    'files' => array('js' => array('example_1.js')),
+  );
+  $libraries['example_dependency_incompatible'] = array(
+    'name' => 'Example dependency incompatible',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'dependencies' => array('example_dependency (>1.1)'),
+    'files' => array('js' => array('example_1.js')),
+  );
+  $libraries['example_dependency_compatible'] = array(
+    'name' => 'Example dependency compatible',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'dependencies' => array('example_dependency (>=1.1)'),
+    'files' => array('js' => array('example_1.js')),
+  );
+
+  // Test the applying of callbacks.
+  $libraries['example_callback'] = array(
+    'name' => 'Example callback',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'versions' => array(
+      '1' => array(
+        'variants' => array(
+          'example_variant' => array(
+            // These keys are for testing purposes only.
+            'info callback' => 'not applied',
+            'pre-detect callback' => 'not applied',
+            'post-detect callback' => 'not applied',
+            'pre-dependencies-load callback' => 'not applied',
+            'pre-load callback' => 'not applied',
+            'post-load callback' => 'not applied',
+          ),
+        ),
+        // These keys are for testing purposes only.
+        'info callback' => 'not applied',
+        'pre-detect callback' => 'not applied',
+        'post-detect callback' => 'not applied',
+        'pre-dependencies-load callback' => 'not applied',
+        'pre-load callback' => 'not applied',
+        'post-load callback' => 'not applied',
+      ),
+    ),
+    'variants' => array(
+      'example_variant' => array(
+        // These keys are for testing purposes only.
+        'info callback' => 'not applied',
+        'pre-detect callback' => 'not applied',
+        'post-detect callback' => 'not applied',
+        'pre-dependencies-load callback' => 'not applied',
+        'pre-load callback' => 'not applied',
+        'post-load callback' => 'not applied',
+      ),
+    ),
+    'callbacks' => array(
+      'info' => array('_libraries_test_module_info_callback'),
+      'pre-detect' => array('_libraries_test_module_pre_detect_callback'),
+      'post-detect' => array('_libraries_test_module_post_detect_callback'),
+      'pre-dependencies-load' => array('_libraries_test_module_pre_dependencies_load_callback'),
+      'pre-load' => array('_libraries_test_module_pre_load_callback'),
+      'post-load' => array('_libraries_test_module_post_load_callback'),
+    ),
+    // These keys are for testing purposes only.
+    'info callback' => 'not applied',
+    'pre-detect callback' => 'not applied',
+    'post-detect callback' => 'not applied',
+    'pre-dependencies-load callback' => 'not applied',
+    'pre-load callback' => 'not applied',
+    'post-load callback' => 'not applied',
+  );
+
+  $libraries['example_path_variable_override'] = array(
+    'name' => 'Example path variable override',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'files' => array(
+      'php' => array('example_1.php', 'example_2.php'),
+    ),
+  );
+
+  return $libraries;
+}
+
+/**
+ * Implements hook_libraries_info_alter().
+ */
+function libraries_test_module_libraries_info_alter(&$libraries) {
+  $libraries['example_module']['module_altered'] = TRUE;
+}
+
+/**
+ * Implements hook_libraries_info_file_paths()
+ */
+function libraries_test_module_libraries_info_file_paths() {
+  return array(drupal_get_path('module', 'libraries') . '/tests/libraries');
+}
+
+/**
+ * Gets the version of an example library.
+ *
+ * Returns exactly the version string entered as the $version parameter. This
+ * function cannot be collapsed with _libraries_test_module_return_installed(),
+ * because of the different arguments that are passed automatically.
+ */
+function _libraries_test_module_return_version($library, $version) {
+  return $version;
+}
+
+/**
+ * Gets the version information from an arbitrary library.
+ *
+ * Test function for a version callback with multiple arguments. This is an
+ * exact copy of libraries_get_version(), which uses a single $option argument,
+ * except for the fact that it uses multiple arguments. Since we support both
+ * type of version callbacks, detecting the version of a test library with this
+ * function ensures that the arguments are passed correctly. This function might
+ * be a useful reference for a custom version callback that uses multiple
+ * parameters.
+ *
+ * @param $library
+ *   An associative array containing all information about the library.
+ * @param $file
+ *   The filename to parse for the version, relative to the library path. For
+ *   example: 'docs/changelog.txt'.
+ * @param pattern
+ *   A string containing a regular expression (PCRE) to match the library
+ *   version. For example: '/@version (\d+)\.(\d+)/'.
+ * @param lines
+ *   (optional) The maximum number of lines to search the pattern in. Defaults
+ *   to 20.
+ * @param cols
+ *   (optional) The maximum number of characters per line to take into account.
+ *   Defaults to 200. In case of minified or compressed files, this prevents
+ *   reading the entire file into memory.
+ *
+ * @return
+ *   A string containing the version of the library.
+ *
+ * @see libraries_get_version()
+ */
+function _libraries_test_module_get_version($library, $file, $pattern, $lines = 20, $cols = 200) {
+
+  $file = DRUPAL_ROOT . '/' . $library['library path'] . '/' . $file;
+  if (!file_exists($file)) {
+    return;
+  }
+  $file = fopen($file, 'r');
+  while ($lines && $line = fgets($file, $cols)) {
+    if (preg_match($pattern, $line, $version)) {
+      fclose($file);
+      return $version[1];
+    }
+    $lines--;
+  }
+  fclose($file);
+}
+
+/**
+ * Detects the variant of an example library.
+ *
+ * Returns exactly the value of $installed, either TRUE or FALSE. This function
+ * cannot be collapsed with _libraries_test_module_return_version(), because of
+ * the different arguments that are passed automatically.
+ */
+function _libraries_test_module_return_installed($library, $name, $installed) {
+  return $installed;
+}
+
+/**
+ * Sets the 'info callback' key.
+ *
+ * This function is used as a test callback for the 'info' callback group.
+ *
+ * @see _libraries_test_module_callback()
+ */
+function _libraries_test_module_info_callback(&$library, $version, $variant) {
+  _libraries_test_module_callback($library, $version, $variant, 'info');
+}
+
+/**
+ * Sets the 'pre-detect callback' key.
+ *
+ * This function is used as a test callback for the 'pre-detect' callback group.
+ *
+ * @see _libraries_test_module_callback()
+ */
+function _libraries_test_module_pre_detect_callback(&$library, $version, $variant) {
+  _libraries_test_module_callback($library, $version, $variant, 'pre-detect');
+}
+
+/**
+ * Sets the 'post-detect callback' key.
+ *
+ * This function is used as a test callback for the 'post-detect callback group.
+ *
+ * @see _libraries_test_module_callback()
+ */
+function _libraries_test_module_post_detect_callback(&$library, $version, $variant) {
+  _libraries_test_module_callback($library, $version, $variant, 'post-detect');
+}
+
+/**
+ * Sets the 'pre-dependencies-load callback' key.
+ *
+ * This function is used as a test callback for the 'pre-dependencies-load'
+ * callback group.
+ *
+ * @see _libraries_test_module_callback()
+ */
+function _libraries_test_module_pre_dependencies_load_callback(&$library, $version, $variant) {
+  _libraries_test_module_callback($library, $version, $variant, 'pre-dependencies-load');
+}
+
+/**
+ * Sets the 'pre-load callback' key.
+ *
+ * This function is used as a test callback for the 'pre-load' callback group.
+ *
+ * @see _libraries_test_module_callback()
+ */
+function _libraries_test_module_pre_load_callback(&$library, $version, $variant) {
+  _libraries_test_module_callback($library, $version, $variant, 'pre-load');
+}
+
+/**
+ * Sets the 'post-load callback' key.
+ *
+ * This function is used as a test callback for the 'post-load' callback group.
+ *
+ * @see _libraries_test_module_callback()
+ */
+function _libraries_test_module_post_load_callback(&$library, $version, $variant) {
+  _libraries_test_module_callback($library, $version, $variant, 'post-load');
+}
+
+/**
+ * Sets the '[group] callback' key, where [group] is prepare, detect, or load.
+ *
+ * This function is used as a test callback for the all callback groups.
+ *
+ * It sets the '[group] callback' (see above) key to 'applied ([part])' where
+ * [part] is either 'top-level', 'version x.y' (where x.y is the passed-in
+ * version string), 'variant example' (where example is the passed-in variant
+ * name), or 'version x.y, variant example' (see above), depending on the part
+ * of the library the passed-in library information belongs to.
+ *
+ * @param $library
+ *   An array of library information, which may be version- or variant-specific.
+ *   Passed by reference.
+ * @param $version
+ *   The version the library information passed in $library belongs to, or NULL
+ *   if the passed library information is not version-specific.
+ * @param $variant
+ *   The variant the library information passed in $library belongs to, or NULL
+ *   if the passed library information is not variant-specific.
+ */
+function _libraries_test_module_callback(&$library, $version, $variant, $group) {
+  $string = 'applied';
+  if (isset($version) && isset($variant)) {
+    $string .= " (version $version, variant $variant)";
+  }
+  elseif (isset($version)) {
+    $string .= " (version $version)";
+  }
+  elseif (isset($variant)) {
+    $string .= " (variant $variant)";
+  }
+  else {
+    $string .= ' (top-level)';
+  }
+  $library["$group callback"] = $string;
+
+  // The following is used to test caching of library information.
+  // Only set the message for the top-level library to prevent confusing,
+  // duplicate messages.
+  if (!isset($version) && !isset($variant) && variable_get('libraries_test_module_cache', FALSE)) {
+    drupal_set_message("The <em>$group</em> callback group was invoked.");
+  }
+}
+
+/**
+ * Implements hook_menu().
+ */
+function libraries_test_module_menu() {
+  $base = array(
+    'page callback' => '_libraries_test_module_load',
+    'access callback' => TRUE,
+  );
+  $items['libraries-test-module/files'] = $base + array(
+    'title' => 'Test files',
+    'page arguments' => array('example_files'),
+  );
+  $items['libraries-test-module/module-integration-files'] = $base + array(
+    'title' => 'Test module integration files',
+    'page arguments' => array('example_module_integration_files'),
+  );
+  $items['libraries-test-module/module-integration-files-post-load'] = $base + array(
+   'title' => 'Test module post-load integration files',
+    'page arguments' => array('example_module_integration_files_post_load'),
+  );
+  $items['libraries-test-module/theme-integration-files'] = $base + array(
+    'title' => 'Test theme integration files',
+    'page arguments' => array('example_theme_integration_files'),
+  );
+  $items['libraries-test-module/versions'] = $base + array(
+    'title' => 'Test version loading',
+    'page arguments' => array('example_versions'),
+  );
+  $items['libraries-test-module/variant'] = $base + array(
+    'title' => 'Test variant loading',
+    'page arguments' => array('example_variant', 'example_variant'),
+  );
+  $items['libraries-test-module/versions-and-variants'] = $base + array(
+    'title' => 'Test concurrent version and variant loading',
+    'page arguments' => array('example_versions_and_variants', 'example_variant_2'),
+  );
+  $items['libraries-test-module/cache'] = $base + array(
+    'title' => 'Test caching of library information',
+    'page arguments' => array('example_callback'),
+  );
+  return $items;
+}
+
+/**
+ * Loads a specified library (variant) for testing.
+ *
+ * JavaScript and CSS files can be checked directly by SimpleTest, so we only
+ * need to manually check for PHP files. We provide information about the loaded
+ * JavaScript and CSS files for easier debugging. See example/README.txt for
+ * more information.
+ */
+function _libraries_test_module_load($library, $variant = NULL) {
+  libraries_load($library, $variant);
+  // JavaScript and CSS files can be checked directly by SimpleTest, so we only
+  // need to manually check for PHP files.
+  $output = '';
+
+  // For easer debugging of JS loading, a text is shown that the JavaScript will
+  // replace.
+  $output .= '<h2>JavaScript</h2>';
+  $output .= '<div class="libraries-test-module-js">';
+  $output .= 'If this text shows up, no JavaScript test file was loaded.';
+  $output .= '</div>';
+
+  // For easier debugging of CSS loading, the loaded CSS files will color the
+  // following text.
+  $output .= '<h2>CSS</h2>';
+  $output .= '<div class="libraries-test-module-css">';
+  $output .= 'If one of the CSS test files has been loaded, this text will be colored:';
+  $output .= '<ul>';
+  // Do not reference the actual CSS files (i.e. including '.css'), because that
+  // breaks testing.
+  $output .= '<li>example_1: red</li>';
+  $output .= '<li>example_2: green</li>';
+  $output .= '<li>example_3: orange</li>';
+  $output .= '<li>example_4: blue</li>';
+  $output .= '<li>libraries_test_module: purple</li>';
+  $output .= '<li>libraries_test_theme: turquoise</li>';
+  $output .= '</ul>';
+  $output .= '</div>';
+
+  $output .= '<h2>PHP</h2>';
+  $output .= '<div class="libraries-test-module-php">';
+  $output .= 'The following is a list of all loaded test PHP files:';
+  $output .= '<ul>';
+  $files = get_included_files();
+  foreach ($files as $file) {
+    if (strpos($file, 'libraries/test') && !strpos($file, 'libraries_test_module.module') && !strpos($file, 'template.php')) {
+      $output .= '<li>' . str_replace(DRUPAL_ROOT . '/', '', $file) . '</li>';
+    }
+  }
+  $output .= '</ul>';
+  $output .= '</div>';
+
+  return $output;
+}
+
+/**
+ * Implements hook_system_theme_info().
+ */
+function libraries_test_module_system_theme_info() {
+  $themes = array();
+  $themes['libraries_test_theme'] = drupal_get_path('module', 'libraries') . '/tests/themes/libraries_test_theme/libraries_test_theme.info';
+  return $themes;
+}
@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * @file
+ * Test PHP file for Libraries loading.
+
+/**
+ * Dummy function to see if this file was loaded.
+ */
+function _libraries_test_module_integration_file_post_load() {
+}
+
+// Call a function that is defined in the library file, to ensure that was
+// loaded prior to this file.
+_libraries_test_module_example_1();
@@ -0,0 +1,12 @@
+
+/**
+ * @file
+ * Test CSS file for Libraries loading.
+ *
+ * Color the 'libraries-test-module-css' div purple. See README.txt for more
+ * information.
+ */
+
+.libraries-test-module-css {
+  color: turquoise;
+}
@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * @file
+ * Test PHP file for Libraries loading.
+
+/**
+ * Dummy function to see if this file was loaded.
+ */
+function _libraries_test_theme_integration_file() {
+}
@@ -0,0 +1,11 @@
+name = Libraries test theme
+description = Tests that themes can provide and alter library information.
+core = 7.x
+hidden = TRUE
+
+; Information added by Drupal.org packaging script on 2016-05-12
+version = "7.x-2.3"
+core = "7.x"
+project = "libraries"
+datestamp = "1463077450"
+
@@ -0,0 +1,18 @@
+
+/**
+ * @file
+ * Test JavaScript file for Libraries loading.
+ *
+ * Replace the text in the 'libraries-test-module-js' div. See README.txt for
+ * more information.
+ */
+
+(function ($) {
+
+Drupal.behaviors.librariesTest = {
+  attach: function(context, settings) {
+    $('.libraries-test-module-js').text('If this text shows up, libraries_test_theme.js was loaded successfully.')
+  }
+};
+
+})(jQuery);
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * @file
+ * Libraries test theme.
+ */
+
+/**
+ * Implements hook_libraries_info().
+ */
+function libraries_test_theme_libraries_info() {
+  $libraries['example_theme'] = array(
+    'name' => 'Example theme',
+    'theme_altered' => FALSE,
+  );
+  $libraries['example_theme_integration_files'] = array(
+    'name' => 'Example theme integration file',
+    'library path' => drupal_get_path('module', 'libraries') . '/tests/libraries/example',
+    'version' => '1',
+    'integration files' => array(
+      'libraries_test_theme' => array(
+        'js' => array('libraries_test_theme.js'),
+        'css' => array('libraries_test_theme.css'),
+        'php' => array('libraries_test_theme.inc'),
+      ),
+    ),
+  );
+  return $libraries;
+}
+
+/**
+ * Implements hook_libraries_info_alter().
+ */
+function libraries_test_theme_libraries_info_alter(&$libraries) {
+  $libraries['example_theme']['theme_altered'] = TRUE;
+}