diff --git a/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldWidgetSettingsTest.php b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldWidgetSettingsTest.php
index ba2d1326b17f1d1604d7a8394f24a306d2b4ff9b..1317fa16c418e4d51581dc9aee64dac874bf0bb4 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldWidgetSettingsTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldWidgetSettingsTest.php
@@ -31,7 +31,7 @@ protected function setUp(): void {
   public function testWidgetSettings() {
     // Test the config can be loaded.
     $form_display = EntityFormDisplay::load('node.story.default');
-    $this->assertIdentical(FALSE, is_null($form_display), "Form display node.story.default loaded with config.");
+    $this->assertNotNull($form_display);
 
     // Text field.
     $component = $form_display->getComponent('field_test');
diff --git a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php
index 9dceabe3a6a2fa81316404e141b4ba062ea5e2e6..b3bd60113384c6b417fe83151d2159e74f87a565 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php
@@ -80,7 +80,7 @@ protected function assertComponent($display_id, $component_id, $type, $label, $w
    */
   protected function assertComponentNotExists($display_id, $component_id) {
     $component = EntityViewDisplay::load($display_id)->getComponent($component_id);
-    $this->assertTrue(is_null($component));
+    $this->assertNull($component);
   }
 
   /**
diff --git a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityDisplayTest.php b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityDisplayTest.php
index d026ee12f1f8514242ca6d31d871551c2156f9cb..34fa900f7e6bdb785e66e57652d5bee1821a6b15 100644
--- a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityDisplayTest.php
+++ b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityDisplayTest.php
@@ -42,7 +42,7 @@ public function testUploadEntityDisplay() {
     // Assure this doesn't exist.
     $display = EntityViewDisplay::load('node.article.default');
     $component = $display->getComponent('upload');
-    $this->assertTrue(is_null($component));
+    $this->assertNull($component);
 
     $this->assertIdentical([['node', 'page', 'default', 'upload']], $this->getMigration('d6_upload_entity_display')->getIdMap()->lookupDestinationIds(['page']));
   }
diff --git a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityFormDisplayTest.php b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityFormDisplayTest.php
index 0ed44fefd35af9b4989e015f030dfcf76870563d..f880dc3af3bf88f0a68c94def590910cdb284b2d 100644
--- a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityFormDisplayTest.php
+++ b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadEntityFormDisplayTest.php
@@ -42,7 +42,7 @@ public function testUploadEntityFormDisplay() {
     // Assure this doesn't exist.
     $display = EntityFormDisplay::load('node.article.default');
     $component = $display->getComponent('upload');
-    $this->assertTrue(is_null($component));
+    $this->assertNull($component);
 
     $this->assertIdentical([['node', 'page', 'default', 'upload']], $this->getMigration('d6_upload_entity_form_display')->getIdMap()->lookupDestinationIds(['page']));
   }
diff --git a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadInstanceTest.php b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadInstanceTest.php
index 25a350b4fb99e31220600b7b663f268cbfd7aecc..dfd5f4fc9fba4b26afd1df031fa73f6d7c90b824 100644
--- a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadInstanceTest.php
+++ b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateUploadInstanceTest.php
@@ -41,7 +41,7 @@ public function testUploadFieldInstance() {
 
     // Shouldn't exist.
     $field = FieldConfig::load('node.article.upload');
-    $this->assertTrue(is_null($field));
+    $this->assertNull($field);
 
     $this->assertIdentical([['node', 'page', 'upload']], $this->getMigration('d6_upload_field_instance')->getIdMap()->lookupDestinationIds(['page']));
   }
diff --git a/core/modules/jsonapi/tests/src/Unit/Query/EntityConditionTest.php b/core/modules/jsonapi/tests/src/Unit/Query/EntityConditionTest.php
index 5f75053246cbd6df8df23a757580b3df46d3d711..7f9b628174ea07257c86999927fdfbe49caaac92 100644
--- a/core/modules/jsonapi/tests/src/Unit/Query/EntityConditionTest.php
+++ b/core/modules/jsonapi/tests/src/Unit/Query/EntityConditionTest.php
@@ -79,7 +79,7 @@ public function testValidation($input, $exception) {
       $this->expectExceptionMessage($exception->getMessage());
     }
     EntityCondition::createFromQueryParameter($input);
-    $this->assertTrue(is_null($exception), 'No exception was expected.');
+    $this->assertNull($exception, 'No exception was expected.');
   }
 
   /**
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateViewModesTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateViewModesTest.php
index b59760e758c09585a111fa75b3f6a04fcc9f2cbb..2b2891a25521acddde3fd32033dc00fe51c9bf00 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateViewModesTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateViewModesTest.php
@@ -26,7 +26,7 @@ protected function setUp(): void {
   public function testViewModes() {
     // Test a new view mode.
     $view_mode = EntityViewMode::load('node.preview');
-    $this->assertIdentical(FALSE, is_null($view_mode), 'Preview view mode loaded.');
+    $this->assertNotNull($view_mode);
     $this->assertIdentical('Preview', $view_mode->label(), 'View mode has correct label.');
     // Test the ID map.
     $this->assertIdentical([['node', 'preview']], $this->getMigration('d6_view_modes')->getIdMap()->lookupDestinationIds([1]));
diff --git a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php
index 661f021963dcabd71fe679f929f1b0f0a52deedf..02a1f46c1839d7468aa0253aa1e41eab75362797 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php
@@ -39,7 +39,7 @@ protected function setUp(): void {
    */
   public function testUserProfileValues() {
     $user = User::load(2);
-    $this->assertFalse(is_null($user));
+    $this->assertNotNull($user);
     $this->assertIdentical('red', $user->profile_color->value);
     $expected = <<<EOT
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