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diff --git a/web/core/modules/workspaces/tests/src/Functional/WorkspaceCacheContextTest.php b/web/core/modules/workspaces/tests/src/Functional/WorkspaceCacheContextTest.php
new file mode 100644
index 000000000..f47ae7f54
--- /dev/null
+++ b/web/core/modules/workspaces/tests/src/Functional/WorkspaceCacheContextTest.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace Drupal\Tests\workspaces\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Drupal\Tests\system\Functional\Cache\AssertPageCacheContextsAndTagsTrait;
+use Drupal\workspaces\Entity\Workspace;
+use Drupal\workspaces\WorkspaceCacheContext;
+
+/**
+ * Tests the workspace cache context.
+ *
+ * @group workspaces
+ * @group Cache
+ */
+class WorkspaceCacheContextTest extends BrowserTestBase {
+
+  use AssertPageCacheContextsAndTagsTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['block', 'node', 'workspaces'];
+
+  /**
+   * Tests the 'workspace' cache context.
+   */
+  public function testWorkspaceCacheContext() {
+    $this->dumpHeaders = TRUE;
+
+    $renderer = \Drupal::service('renderer');
+    $cache_contexts_manager = \Drupal::service("cache_contexts_manager");
+
+    // Check that the 'workspace' cache context is present when the module is
+    // installed.
+    $this->drupalGet('<front>');
+    $this->assertCacheContext('workspace');
+
+    $cache_context = new WorkspaceCacheContext(\Drupal::service('workspaces.manager'));
+    $this->assertSame('live', $cache_context->getContext());
+
+    // Create a node and check that its render array contains the proper cache
+    // context.
+    $this->drupalCreateContentType(['type' => 'page']);
+    $node = $this->createNode();
+
+    // Get a fully built entity view render array.
+    $build = \Drupal::entityTypeManager()->getViewBuilder('node')->view($node, 'full');
+
+    // Render it so the default cache contexts are applied.
+    $renderer->renderRoot($build);
+    $this->assertTrue(in_array('workspace', $build['#cache']['contexts'], TRUE));
+
+    $cid_parts = array_merge($build['#cache']['keys'], $cache_contexts_manager->convertTokensToKeys($build['#cache']['contexts'])->getKeys());
+    $this->assertTrue(in_array('[workspace]=live', $cid_parts, TRUE));
+
+    // Test that a cache entry is created.
+    $cid = implode(':', $cid_parts);
+    $bin = $build['#cache']['bin'];
+    $this->assertTrue($this->container->get('cache.' . $bin)->get($cid), 'The entity render element has been cached.');
+
+    // Switch to the 'stage' workspace and check that the correct workspace
+    // cache context is used.
+    $test_user = $this->drupalCreateUser(['view any workspace']);
+    $this->drupalLogin($test_user);
+
+    $stage = Workspace::load('stage');
+    $workspace_manager = \Drupal::service('workspaces.manager');
+    $workspace_manager->setActiveWorkspace($stage);
+
+    $cache_context = new WorkspaceCacheContext($workspace_manager);
+    $this->assertSame('stage', $cache_context->getContext());
+
+    $build = \Drupal::entityTypeManager()->getViewBuilder('node')->view($node, 'full');
+
+    // Render it so the default cache contexts are applied.
+    $renderer->renderRoot($build);
+    $this->assertTrue(in_array('workspace', $build['#cache']['contexts'], TRUE));
+
+    $cid_parts = array_merge($build['#cache']['keys'], $cache_contexts_manager->convertTokensToKeys($build['#cache']['contexts'])->getKeys());
+    $this->assertTrue(in_array('[workspace]=stage', $cid_parts, TRUE));
+  }
+
+}