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diff --git a/web/modules/contrib/libraries/tests/src/Unit/Plugin/libraries/VersionDetector/LinePatternDetectorTest.php b/web/modules/contrib/libraries/tests/src/Unit/Plugin/libraries/VersionDetector/LinePatternDetectorTest.php
new file mode 100644
index 000000000..5e4e34b93
--- /dev/null
+++ b/web/modules/contrib/libraries/tests/src/Unit/Plugin/libraries/VersionDetector/LinePatternDetectorTest.php
@@ -0,0 +1,197 @@
+<?php
+
+namespace Drupal\Tests\libraries\Unit\Plugin\libraries\VersionDetector;
+
+use Drupal\libraries\ExternalLibrary\Local\LocalLibraryInterface;
+use Drupal\libraries\ExternalLibrary\Version\VersionedLibraryInterface;
+use Drupal\libraries\Plugin\libraries\VersionDetector\LinePatternDetector;
+use Drupal\Tests\UnitTestCase;
+use org\bovigo\vfs\vfsStream;
+
+/**
+ * Tests the line pattern version detector.
+ *
+ * @group libraries
+ *
+ * @coversDefaultClass \Drupal\libraries\Plugin\libraries\VersionDetector\LinePatternDetector
+ */
+class LinePatternDetectorTest extends UnitTestCase {
+
+  protected $libraryId = 'test_library';
+
+  /**
+   * Tests that version detection fails for a non-local library.
+   *
+   * @expectedException \Drupal\libraries\ExternalLibrary\Exception\UnknownLibraryVersionException
+   *
+   * @covers ::detectVersion
+   */
+  public function testDetectVersionNonLocal() {
+    $library = $this->prophesize(VersionedLibraryInterface::class);
+    $detector = $this->setupDetector();
+    $detector->detectVersion($library->reveal());
+  }
+
+  /**
+   * Tests that version detection fails for a missing file.
+   *
+   * @expectedException \Drupal\libraries\ExternalLibrary\Exception\UnknownLibraryVersionException
+   *
+   * @covers ::detectVersion
+   */
+  public function testDetectVersionMissingFile() {
+    $library = $this->setupLibrary();
+
+    $detector = $this->setupDetector(['file' => 'CHANGELOG.txt']);
+    $detector->detectVersion($library->reveal());
+  }
+
+  /**
+   * Tests that version detection fails without a version in the file.
+   *
+   * @dataProvider providerTestDetectVersionNoVersion
+   *
+   * @covers ::detectVersion
+   */
+  public function testDetectVersionNoVersion($configuration, $file_contents) {
+    $library = $this->setupLibrary();
+
+    $detector = $this->setupDetector($configuration);
+    $this->setupFile($configuration['file'], $file_contents);
+
+    $library->setVersion()->shouldNotBeCalled();
+    $detector->detectVersion($library->reveal());
+  }
+
+  /**
+   * @return array
+   */
+  public function providerTestDetectVersionNoVersion() {
+    $test_cases = [];
+
+    $configuration = [
+      'file' => 'CHANGELOG.txt',
+      'pattern' => '/@version (\d+\.\d+\.\d+)/'
+    ];
+
+    $test_cases['empty_file'] = [$configuration, ''];
+
+    $test_cases['no_version'] = [$configuration, <<<EOF
+This is a file with
+multiple lines that does
+not contain a version.
+EOF
+    ];
+
+    $configuration['lines'] = 3;
+    $test_cases['long_file'] = [$configuration, <<<EOF
+This is a file that
+contains the version after
+the maximum number of lines
+to test has been surpassed.
+
+@version 1.2.3
+EOF
+    ];
+
+    $configuration['columns'] = 10;
+    // @todo Document why this is necessary.
+    $configuration['lines'] = 2;
+    $test_cases['long_column'] = [$configuration, <<<EOF
+This is a file that contains the version after
+the maximum number of columns to test has been surpassed. @version 1.2.3
+EOF
+    ];
+
+    return $test_cases;
+  }
+
+  /**
+   * Tests that version detection succeeds with a version in the file.
+   *
+   * @dataProvider providerTestDetectVersion
+   *
+   * @covers ::detectVersion
+   */
+  public function testDetectVersion($configuration, $file_contents, $version) {
+    $library = $this->setupLibrary();
+
+    $detector = $this->setupDetector($configuration);
+    $this->setupFile($configuration['file'], $file_contents);
+
+    $library->setVersion($version)->shouldBeCalled();
+    $detector->detectVersion($library->reveal());
+  }
+
+  /**
+   * @return array
+   */
+  public function providerTestDetectVersion() {
+    $test_cases = [];
+
+    $configuration = [
+      'file' => 'CHANGELOG.txt',
+      'pattern' => '/@version (\d+\.\d+\.\d+)/'
+    ];
+    $version = '1.2.3';
+
+    $test_cases['version'] = [$configuration, <<<EOF
+This a file with a version
+
+@version $version
+EOF
+    , $version];
+
+    return $test_cases;
+  }
+
+  /**
+   * Sets up the library prophecy and returns it.
+   *
+   * @return \Prophecy\Prophecy\ObjectProphecy
+   */
+  protected function setupLibrary() {
+    $library = $this->prophesize(VersionedLibraryInterface::class);
+    $library->willImplement(LocalLibraryInterface::class);
+    $library->getId()->willReturn($this->libraryId);
+    $library->getLocalPath()->willReturn('libraries/' . $this->libraryId);
+    return $library;
+  }
+
+  /**
+   * Sets up the version detector for testing and returns it.
+   *
+   * @param array $configuration
+   *   The plugin configuration to set the version detector up with.
+   *
+   * @return \Drupal\libraries\Plugin\libraries\VersionDetector\LinePatternDetector
+   *   The line pattern version detector to test.
+   */
+  protected function setupDetector(array $configuration = []) {
+    $app_root = 'root';
+    vfsStream::setup($app_root);
+
+    $plugin_id = 'line_pattern';
+    $plugin_definition = [
+      'id' => $plugin_id,
+      'class' => LinePatternDetector::class,
+      'provider' => 'libraries',
+    ];
+    return new LinePatternDetector($configuration, $plugin_id, $plugin_definition, 'vfs://' . $app_root);
+  }
+
+  /**
+   * @param $file
+   * @param $file_contents
+   */
+  protected function setupFile($file, $file_contents) {
+    vfsStream::create([
+      'libraries' => [
+        $this->libraryId => [
+          $file => $file_contents,
+        ],
+      ],
+    ]);
+  }
+
+}