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diff --git a/web/modules/contrib/diff/tests/src/Unit/VisualDiffThemeNegotiatorTest.php b/web/modules/contrib/diff/tests/src/Unit/VisualDiffThemeNegotiatorTest.php
new file mode 100644
index 000000000..f7a6de896
--- /dev/null
+++ b/web/modules/contrib/diff/tests/src/Unit/VisualDiffThemeNegotiatorTest.php
@@ -0,0 +1,134 @@
+<?php
+
+namespace Drupal\Tests\diff\Unit;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Config\ImmutableConfig;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\diff\VisualDiffThemeNegotiator;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests theme negotiator.
+ *
+ * @coversDefaultClass \Drupal\diff\VisualDiffThemeNegotiator
+ * @group diff
+ */
+class VisualDiffThemeNegotiatorTest extends UnitTestCase {
+
+  /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface|\Prophecy\Prophecy\ProphecyInterface
+   */
+  protected $configFactory;
+
+  /**
+   * The class under test.
+   *
+   * @var \Drupal\diff\VisualDiffThemeNegotiator
+   */
+  protected $themeNegotiator;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->configFactory = $this->prophesize(ConfigFactoryInterface::class);
+    $this->themeNegotiator = new VisualDiffThemeNegotiator($this->configFactory->reveal());
+  }
+
+  /**
+   * @covers ::determineActiveTheme
+   */
+  public function testDetermineActiveTheme() {
+    $config = $this->prophesize(ImmutableConfig::class);
+    $config->get('default')->willReturn('the_default_theme');
+    $this->configFactory->get('system.theme')->willReturn($config->reveal());
+
+    $route_match = $this->prophesize(RouteMatchInterface::class);
+    $result = $this->themeNegotiator->determineActiveTheme($route_match->reveal());
+    $this->assertSame('the_default_theme', $result);
+  }
+
+  /**
+   * Tests if the theme negotiator applies under correct conditions.
+   *
+   * @param string $filter_parameter
+   *   The filter parameter.
+   * @param string $route_name
+   *   The route name.
+   * @param string $config_value
+   *   The configuration value of the element taken from the form values.
+   * @param bool $expected
+   *   The expected result.
+   *
+   * @covers ::applies
+   * @covers ::isDiffRoute
+   *
+   * @dataProvider providerTestApplies
+   */
+  public function testApplies($filter_parameter, $route_name, $config_value, $expected) {
+    $route_match = $this->prophesize(RouteMatchInterface::class);
+    $route_match->getParameter('filter')->willReturn($filter_parameter);
+
+    if ($route_name) {
+      $route_match->getRouteName()->willReturn($route_name);
+    }
+    else {
+      $route_match->getRouteName()->shouldNotBeCalled();
+    }
+
+    if ($config_value) {
+      $diff_config = $this->prophesize(ImmutableConfig::class);
+      $diff_config->get('general_settings.visual_inline_theme')->willReturn($config_value);
+      $this->configFactory->get('diff.settings')->willReturn($diff_config->reveal());
+    }
+    else {
+      $this->configFactory->get('diff.settings')->shouldNotBeCalled();
+    }
+
+    $this->assertSame($expected, $this->themeNegotiator->applies($route_match->reveal()));
+  }
+
+  /**
+   * Provides test data to ::testApplies().
+   */
+  public function providerTestApplies() {
+    $data = [];
+    $data[] = [
+      'unexpected_filter_parameter',
+      NULL,
+      NULL,
+      FALSE,
+    ];
+    $data[] = [
+      'visual_inline',
+      'unexpected_route_name',
+      NULL,
+      FALSE,
+    ];
+    $data[] = [
+      'visual_inline',
+      'diff.revisions_diff',
+      'unexpected_config_value',
+      FALSE,
+    ];
+    $data[] = [
+      'visual_inline',
+      'diff.revisions_diff',
+      'default',
+      TRUE,
+    ];
+    $data[] = [
+      'visual_inline',
+      'entity.foo.revisions_diff',
+      'default',
+      TRUE,
+    ];
+    return $data;
+  }
+
+}