diff --git a/core/modules/ckeditor5/tests/src/FunctionalJavascript/MediaTest.php b/core/modules/ckeditor5/tests/src/FunctionalJavascript/MediaTest.php
index dff67204df9d0a1e60338140a659b6f3587efff4..12ce29ed78951d1243580a105e44a2806f6b80ca 100644
--- a/core/modules/ckeditor5/tests/src/FunctionalJavascript/MediaTest.php
+++ b/core/modules/ckeditor5/tests/src/FunctionalJavascript/MediaTest.php
@@ -375,16 +375,16 @@ function (ConstraintViolation $v) {
     // Wrap the existing drupal-media tag with a div and an a that include
     // attributes allowed via GHS.
     $original_value = $this->host->body->value;
-    $this->host->body->value = '<div data-bar="baz"><a href="https://drupal.org" data-foo="bar">' . $original_value . '</a></div>';
+    $this->host->body->value = '<div data-bar="baz"><a href="https://example.com" data-foo="bar">' . $original_value . '</a></div>';
     $this->host->save();
     $this->drupalGet($this->host->toUrl('edit-form'));
 
     // Confirm data-foo is present in the editing view.
-    $this->assertNotEmpty($link = $assert_session->waitForElementVisible('css', 'a[href="https://drupal.org"]'));
+    $this->assertNotEmpty($link = $assert_session->waitForElementVisible('css', 'a[href="https://example.com"]'));
     $this->assertEquals('bar', $link->getAttribute('data-foo'));
 
     // Confirm that the media is wrapped by the div on the editing view.
-    $assert_session->elementExists('css', 'div[data-bar="baz"] > .drupal-media > a[href="https://drupal.org"] > div[data-drupal-media-preview]');
+    $assert_session->elementExists('css', 'div[data-bar="baz"] > .drupal-media > a[href="https://example.com"] > div[data-drupal-media-preview]');
 
     // Confirm that drupal-media is wrapped by the div and a, and that GHS has
     // retained arbitrary HTML allowed by source editing.
@@ -638,12 +638,12 @@ public function testEditableCaption() {
     $this->pressEditorButton('Link');
     $this->assertVisibleBalloon('.ck-link-form');
     $link_input = $page->find('css', '.ck-balloon-panel .ck-link-form input[type=text]');
-    $link_input->setValue('https://drupal.org');
+    $link_input->setValue('https://example.com');
     $page->find('css', '.ck-balloon-panel .ck-link-form button[type=submit]')->click();
     $this->assertNotEmpty($assert_session->waitForElement('css', '.drupal-media figcaption > a'));
-    $this->assertEquals('<a class="ck-link_selected" href="https://drupal.org">Llamas are the most awesome ever</a>', $figcaption->getHtml());
+    $this->assertEquals('<a class="ck-link_selected" href="https://example.com">Llamas are the most awesome ever</a>', $figcaption->getHtml());
     $editor_dom = $this->getEditorDataAsDom();
-    $this->assertEquals('<a href="https://drupal.org">Llamas are the most awesome ever</a>', $editor_dom->getElementsByTagName('drupal-media')->item(0)->getAttribute('data-caption'));
+    $this->assertEquals('<a href="https://example.com">Llamas are the most awesome ever</a>', $editor_dom->getElementsByTagName('drupal-media')->item(0)->getAttribute('data-caption'));
   }
 
   /**
diff --git a/core/modules/jsonapi/tests/src/Functional/JsonApiFunctionalTestBase.php b/core/modules/jsonapi/tests/src/Functional/JsonApiFunctionalTestBase.php
index e6f4713a653f859d1bc87ce9e6dc0018cfb4b12f..23e22105d579d0ed1f77ce005f1e7a05d83da2a6 100644
--- a/core/modules/jsonapi/tests/src/Functional/JsonApiFunctionalTestBase.php
+++ b/core/modules/jsonapi/tests/src/Functional/JsonApiFunctionalTestBase.php
@@ -327,7 +327,7 @@ protected function createDefaultContent($num_articles, $num_tags, $article_has_i
       // Make sure that there is at least 1 https link for ::testRead() #19.
       $this->nodes[0]->field_link = [
         'title' => 'Drupal',
-        'uri' => 'https://drupal.org',
+        'uri' => 'https://example.com',
       ];
       $this->nodes[0]->save();
     }
diff --git a/core/modules/link/tests/src/Functional/LinkFieldUITest.php b/core/modules/link/tests/src/Functional/LinkFieldUITest.php
index 151204adab034ef35da525fc457323aaab3f5f03..2c40adac32ca8544105dea4b0bbf3fbf25516026 100644
--- a/core/modules/link/tests/src/Functional/LinkFieldUITest.php
+++ b/core/modules/link/tests/src/Functional/LinkFieldUITest.php
@@ -94,7 +94,7 @@ protected function providerTestFieldUI() {
       DRUPAL_OPTIONAL,
     ];
     $link_types = [
-      LinkItemInterface::LINK_EXTERNAL => 'http://drupal.org',
+      LinkItemInterface::LINK_EXTERNAL => 'http://example.com',
       LinkItemInterface::LINK_GENERIC => '',
       LinkItemInterface::LINK_INTERNAL => '<front>',
     ];
diff --git a/core/modules/link/tests/src/Functional/Views/LinkViewsTokensTest.php b/core/modules/link/tests/src/Functional/Views/LinkViewsTokensTest.php
index 8c1f5be9d1cb96bc497809258f00e1d2eb5d7393..96e00da72942eff20dfe056d0674fcae09a22c13 100644
--- a/core/modules/link/tests/src/Functional/Views/LinkViewsTokensTest.php
+++ b/core/modules/link/tests/src/Functional/Views/LinkViewsTokensTest.php
@@ -70,7 +70,7 @@ protected function setUp($import_test_views = TRUE, $modules = ['link_test_views
   public function testLinkViewsTokens() {
     // Array of URI's to test.
     $uris = [
-      'http://www.drupal.org' => 'Drupal.org',
+      'http://www.example.com' => 'example.com',
     ];
 
     // Add nodes with the URI's and titles.
diff --git a/core/modules/link/tests/src/FunctionalJavascript/LinkFieldFormStatesTest.php b/core/modules/link/tests/src/FunctionalJavascript/LinkFieldFormStatesTest.php
index a7e99f06f7c34d1864ff50db4ae39649492ba489..2a6d9ca6b6437f2a692ae21bdb81b8f3ee8bca88 100644
--- a/core/modules/link/tests/src/FunctionalJavascript/LinkFieldFormStatesTest.php
+++ b/core/modules/link/tests/src/FunctionalJavascript/LinkFieldFormStatesTest.php
@@ -67,12 +67,12 @@ public function testLinkFieldFormStates(string $uri, string $title) {
   public function linkFieldFormStatesData() {
     return [
       'Fill uri, keep title empty' => [
-        'https://drupal.org',
+        'https://example.com',
         '',
       ],
       'Fill title, keep uri empty' => [
         '',
-        'https://drupal.org',
+        'https://example.com',
       ],
     ];
   }
diff --git a/core/modules/link/tests/src/Unit/Plugin/Validation/Constraint/LinkExternalProtocolsConstraintValidatorTest.php b/core/modules/link/tests/src/Unit/Plugin/Validation/Constraint/LinkExternalProtocolsConstraintValidatorTest.php
index 506a49de8d4f5bb581639324d87493beac708da8..cc975309b4d19671f34992ac885d82fa193bc739 100644
--- a/core/modules/link/tests/src/Unit/Plugin/Validation/Constraint/LinkExternalProtocolsConstraintValidatorTest.php
+++ b/core/modules/link/tests/src/Unit/Plugin/Validation/Constraint/LinkExternalProtocolsConstraintValidatorTest.php
@@ -53,8 +53,8 @@ public function providerValidate() {
     $data = [];
 
     // Test allowed protocols.
-    $data[] = ['http://www.drupal.org', TRUE];
-    $data[] = ['https://www.drupal.org', TRUE];
+    $data[] = ['http://www.example.com', TRUE];
+    $data[] = ['https://www.example.com', TRUE];
     // cSpell:disable-next-line
     $data[] = ['magnet:?xt=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C', TRUE];
 
diff --git a/core/modules/migrate/tests/src/Unit/process/MenuLinkParentTest.php b/core/modules/migrate/tests/src/Unit/process/MenuLinkParentTest.php
index 427500f57590c2d3907765735dde30bbb77b4f6e..08f9712d71e82ebde9c42bddcd827880b100ea2a 100644
--- a/core/modules/migrate/tests/src/Unit/process/MenuLinkParentTest.php
+++ b/core/modules/migrate/tests/src/Unit/process/MenuLinkParentTest.php
@@ -103,7 +103,7 @@ public function providerTransformException() {
     // The parent ID does not for the following tests.
     return [
       'parent link external and could not be loaded' => [
-        'source_value' => [1, 'admin', 'http://drupal.org'],
+        'source_value' => [1, 'admin', 'http://example.com'],
       ],
       'parent link path/menu name not passed' => [
         'source_value' => [1, NULL, NULL],
diff --git a/core/modules/migrate_drupal/tests/src/Traits/CreateTestContentEntitiesTrait.php b/core/modules/migrate_drupal/tests/src/Traits/CreateTestContentEntitiesTrait.php
index 191f5c402142757cb3aab0e37bbe752266e983be..05da0215f9ecf943bf1119820356352f13cf3da1 100644
--- a/core/modules/migrate_drupal/tests/src/Traits/CreateTestContentEntitiesTrait.php
+++ b/core/modules/migrate_drupal/tests/src/Traits/CreateTestContentEntitiesTrait.php
@@ -163,7 +163,7 @@ protected function createContentPostUpgrade() {
     if ($entity_type_manager->hasDefinition('menu_link_content')) {
       $menu_link = $entity_type_manager->getStorage('menu_link_content')->create([
         'title' => 'post upgrade menu link',
-        'link' => ['uri' => 'http://www.drupal.org'],
+        'link' => ['uri' => 'http://www.example.com'],
         'menu_name' => 'tools',
       ]);
       $menu_link->save();
diff --git a/core/modules/update/tests/src/Unit/ProjectReleaseTest.php b/core/modules/update/tests/src/Unit/ProjectReleaseTest.php
index 8e69006eb13a20c392dbde3829197e4dd6ad0481..4e38599ca9cc49bf3ade87df5d7b4a52e09e747f 100644
--- a/core/modules/update/tests/src/Unit/ProjectReleaseTest.php
+++ b/core/modules/update/tests/src/Unit/ProjectReleaseTest.php
@@ -245,9 +245,9 @@ public function providerCreateFromArrayInvalidField(): array {
   protected function getValidData(): array {
     return [
       'status' => 'published',
-      'release_link' => 'https://drupal.org/release-link',
+      'release_link' => 'https://example.com/release-link',
       'version' => '8.0.0',
-      'download_link' => 'https://drupal.org/download-link',
+      'download_link' => 'https://example.com/download-link',
       'core_compatibility_message' => 'This is compatible',
       'date' => 1452229200,
       'terms' => [
diff --git a/core/modules/views/tests/src/Functional/Handler/FieldWebTest.php b/core/modules/views/tests/src/Functional/Handler/FieldWebTest.php
index bd589fe96003d472456f294256c1b8cba53c75bc..cfc3ff397e4837d9eee519da011b1a7e5118b840 100644
--- a/core/modules/views/tests/src/Functional/Handler/FieldWebTest.php
+++ b/core/modules/views/tests/src/Functional/Handler/FieldWebTest.php
@@ -317,19 +317,19 @@ public function testAlterUrl() {
     // Tests the external flag.
     // Switch on the external flag should output an external URL as well.
     $id_field->options['alter']['external'] = TRUE;
-    $id_field->options['alter']['path'] = $path = 'www.drupal.org';
+    $id_field->options['alter']['path'] = $path = 'www.example.com';
     $output = $renderer->executeInRenderContext(new RenderContext(), function () use ($id_field, $row) {
       return $id_field->theme($row);
     });
-    $this->assertSubString($output, 'http://www.drupal.org');
+    $this->assertSubString($output, 'http://www.example.com');
 
     // Setup a not external URL, which shouldn't lead to an external URL.
     $id_field->options['alter']['external'] = FALSE;
-    $id_field->options['alter']['path'] = $path = 'www.drupal.org';
+    $id_field->options['alter']['path'] = $path = 'www.example.com';
     $output = $renderer->executeInRenderContext(new RenderContext(), function () use ($id_field, $row) {
       return $id_field->theme($row);
     });
-    $this->assertNotSubString($output, 'http://www.drupal.org');
+    $this->assertNotSubString($output, 'http://www.example.com');
 
     // Tests the transforming of the case setting.
     $id_field->options['alter']['path'] = $path = $this->randomMachineName();
diff --git a/core/modules/views/tests/src/Functional/Plugin/DisplayTest.php b/core/modules/views/tests/src/Functional/Plugin/DisplayTest.php
index b136be632565344cf1f7da20eaf1482ed90d2998..97d2ffc2c91b824d100f22600878a1e07e0ea0a5 100644
--- a/core/modules/views/tests/src/Functional/Plugin/DisplayTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/DisplayTest.php
@@ -231,11 +231,11 @@ public function testReadMoreCustomURL() {
 
     // Test more link with absolute URL.
     $view->display_handler->setOption('link_display', 'custom_url');
-    $view->display_handler->setOption('link_url', 'http://drupal.org');
+    $view->display_handler->setOption('link_url', 'http://example.com');
     $this->executeView($view);
     $output = $view->preview();
     $output = $renderer->renderRoot($output);
-    $this->assertStringContainsString('http://drupal.org', $output, 'The read more link with href "http://drupal.org" was found.');
+    $this->assertStringContainsString('http://example.com', $output, 'The read more link with href "http://example.com" was found.');
 
     // Test more link with query parameters in the URL.
     $view->display_handler->setOption('link_display', 'custom_url');
diff --git a/core/modules/views/tests/src/Unit/Plugin/field/FieldPluginBaseTest.php b/core/modules/views/tests/src/Unit/Plugin/field/FieldPluginBaseTest.php
index fe159703984e2dfe933b9f352b16282582ac8a33..8e50cc08f19096ae414e4c05b0df1e50bb57d105 100644
--- a/core/modules/views/tests/src/Unit/Plugin/field/FieldPluginBaseTest.php
+++ b/core/modules/views/tests/src/Unit/Plugin/field/FieldPluginBaseTest.php
@@ -288,9 +288,9 @@ public function providerTestRenderTrimmedWithMoreLinkAndPath() {
     $data[] = ['<front>', '/%3Cfront%3E'];
 
     // External URL.
-    $data[] = ['https://www.drupal.org', 'https://www.drupal.org'];
-    $data[] = ['http://www.drupal.org', 'http://www.drupal.org'];
-    $data[] = ['www.drupal.org', '/www.drupal.org'];
+    $data[] = ['https://www.example.com', 'https://www.example.com'];
+    $data[] = ['http://www.example.com', 'http://www.example.com'];
+    $data[] = ['www.example.com', '/www.example.com'];
 
     return $data;
   }
@@ -379,8 +379,8 @@ public function providerTestRenderAsLinkWithPathAndOptions() {
     $data[] = ['test-path', ['suffix' => 'test_suffix'], '<a href="/test-path">value</a>', '<a href="/test-path">value</a>test_suffix'];
 
     // External URL.
-    $data[] = ['https://www.drupal.org', [], [], '<a href="https://www.drupal.org">value</a>'];
-    $data[] = ['www.drupal.org', ['external' => TRUE], [], '<a href="http://www.drupal.org">value</a>'];
+    $data[] = ['https://www.example.com', [], [], '<a href="https://www.example.com">value</a>'];
+    $data[] = ['www.example.com', ['external' => TRUE], [], '<a href="http://www.example.com">value</a>'];
     $data[] = ['', ['external' => TRUE], [], 'value'];
 
     return $data;
@@ -636,7 +636,7 @@ public function testRenderAsExternalLinkWithPathAndTokens($path, $tokens, $link_
   public function providerTestRenderAsExternalLinkWithPathAndTokens() {
     $data = [];
 
-    $data[] = ['{{ foo }}', ['{{ foo }}' => 'http://www.drupal.org'], '<a href="http://www.drupal.org">value</a>', ['context_path' => 'http://www.drupal.org']];
+    $data[] = ['{{ foo }}', ['{{ foo }}' => 'http://www.example.com'], '<a href="http://www.example.com">value</a>', ['context_path' => 'http://www.example.com']];
     $data[] = ['{{ foo }}', ['{{ foo }}' => ''], 'value', ['context_path' => '']];
     $data[] = ['{{ foo }}', ['{{ foo }}' => ''], 'value', ['context_path' => '', 'alter' => ['external' => TRUE]]];
     $data[] = ['{{ foo }}', ['{{ foo }}' => '/test-path/123'], '<a href="/test-path/123">value</a>', ['context_path' => '/test-path/123']];
@@ -777,7 +777,7 @@ public function setLinkGenerator(LinkGeneratorInterface $link_generator) {
 
 }
 
-// @todo Remove as part of https://www.drupal.org/node/2529170.
+// @todo Remove as part of https://www.example.com/node/2529170.
 namespace Drupal\views\Plugin\views\field;
 
 if (!function_exists('base_path')) {
diff --git a/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php b/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php
index 23ca0d012d79e877857e152d33944feff74cbffb..900de71396e130b1f4e756eadc8cb02856a7459d 100644
--- a/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/UrlHelperTest.php
@@ -430,14 +430,14 @@ public static function providerTestIsExternal() {
       ['https://example.com/external/path', TRUE],
       ['javascript://fake-external-path', FALSE],
       // External URL without an explicit protocol.
-      ['//www.drupal.org/foo/bar?foo=bar&bar=baz&baz#foo', TRUE],
+      ['//www.example.com/foo/bar?foo=bar&bar=baz&baz#foo', TRUE],
       // Internal URL starting with a slash.
-      ['/www.drupal.org', FALSE],
+      ['/www.example.com', FALSE],
       // Simple external URLs.
       ['http://example.com', TRUE],
       ['https://example.com', TRUE],
-      ['http://drupal.org/foo/bar?foo=bar&bar=baz&baz#foo', TRUE],
-      ['//drupal.org', TRUE],
+      ['http://example.com/foo/bar?foo=bar&bar=baz&baz#foo', TRUE],
+      ['//example.com', TRUE],
       // Some browsers ignore or strip leading control characters.
       ["\x00//www.example.com", TRUE],
       ["\x08//www.example.com", TRUE],
@@ -455,7 +455,7 @@ public static function providerTestIsExternal() {
       ['/system/ajax', FALSE],
       ['?q=foo:bar', FALSE],
       ['node/edit:me', FALSE],
-      ['/drupal.org', FALSE],
+      ['/example.com', FALSE],
       ['<front>', FALSE],
     ];
   }
diff --git a/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php b/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php
index 8d1347bc57fb4d22218bad0423ff6c4539519ad2..088a26e01eb6d9954ba33cfc80a523c3bb0a97be 100644
--- a/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php
+++ b/core/tests/Drupal/Tests/Core/Logger/LogMessageParserTest.php
@@ -67,8 +67,8 @@ public function providerTestParseMessagePlaceholders() {
       // Test removal of unexpected placeholders like ! while allowed
       // placeholders beginning with @, % and : are preserved.
       [
-        ['message' => 'Test placeholder with :url and old !bang parameter', 'context' => [':url' => 'https://drupal.org', '!bang' => 'foo bar']],
-        ['message' => 'Test placeholder with :url and old !bang parameter', 'context' => [':url' => 'https://drupal.org']],
+        ['message' => 'Test placeholder with :url and old !bang parameter', 'context' => [':url' => 'https://example.com', '!bang' => 'foo bar']],
+        ['message' => 'Test placeholder with :url and old !bang parameter', 'context' => [':url' => 'https://example.com']],
       ],
     ];
   }
diff --git a/core/tests/Drupal/Tests/Core/Validation/Plugin/Validation/Constraint/PrimitiveTypeConstraintValidatorTest.php b/core/tests/Drupal/Tests/Core/Validation/Plugin/Validation/Constraint/PrimitiveTypeConstraintValidatorTest.php
index 323601e0742cbd448d273fc1219aae9911dd6822..eefca1c96cd1d75b61390986bb2a3e0e54c38093 100644
--- a/core/tests/Drupal/Tests/Core/Validation/Plugin/Validation/Constraint/PrimitiveTypeConstraintValidatorTest.php
+++ b/core/tests/Drupal/Tests/Core/Validation/Plugin/Validation/Constraint/PrimitiveTypeConstraintValidatorTest.php
@@ -64,8 +64,8 @@ public function provideTestValidate() {
     // It is odd that 1 is a valid string.
     // $data[] = [$this->createMock('Drupal\Core\TypedData\Type\StringInterface'), 1, FALSE];
     $data[] = [new StringData(DataDefinition::create('string')), [], FALSE];
-    $data[] = [new Uri(DataDefinition::create('uri')), 'http://www.drupal.org', TRUE];
-    $data[] = [new Uri(DataDefinition::create('uri')), 'https://www.drupal.org', TRUE];
+    $data[] = [new Uri(DataDefinition::create('uri')), 'http://www.example.com', TRUE];
+    $data[] = [new Uri(DataDefinition::create('uri')), 'https://www.example.com', TRUE];
     $data[] = [new Uri(DataDefinition::create('uri')), 'Invalid', FALSE];
     $data[] = [new Uri(DataDefinition::create('uri')), 'entity:node/1', TRUE];
     $data[] = [new Uri(DataDefinition::create('uri')), 'base:', TRUE];
@@ -75,7 +75,7 @@ public function provideTestValidate() {
     $data[] = [new Uri(DataDefinition::create('uri')), 'public://foo.png', TRUE];
     $data[] = [new Uri(DataDefinition::create('uri')), 'private://', FALSE];
     $data[] = [new Uri(DataDefinition::create('uri')), 'private://foo.png', TRUE];
-    $data[] = [new Uri(DataDefinition::create('uri')), 'drupal.org', FALSE];
+    $data[] = [new Uri(DataDefinition::create('uri')), 'example.com', FALSE];
 
     return $data;
   }