diff --git a/core/modules/rest/tests/src/Unit/Plugin/Derivative/EntityDerivativeTest.php b/core/modules/rest/tests/src/Unit/Plugin/Derivative/EntityDerivativeTest.php
index 08b2900..9f42db1 100644
--- a/core/modules/rest/tests/src/Unit/Plugin/Derivative/EntityDerivativeTest.php
+++ b/core/modules/rest/tests/src/Unit/Plugin/Derivative/EntityDerivativeTest.php
@@ -114,15 +114,21 @@ public function testGetDerivativeDefinitions() {
 
     // Default uris.
     $definition = $this->entityDerivative->getDerivativeDefinition('entity1', $base_plugin_definition);
-    $this->assertSame('bar', $definition['foo'], 'The base plugin definition was not properly merged.');
-    $this->assertSame('entity:entity1', $definition['id'], 'The derivative ID was not properly set.');
-    $this->assertSame('/entity/entity1/{entity1}', $definition['uri_paths']['canonical'], 'The default canonical uri was not properly set.');
+    // Plugin definition merge.
+    $this->assertSame('bar', $definition['foo']);
+    // Derivative ID.
+    $this->assertSame('entity:entity1', $definition['id']);
+    // Canonical URI is set to default.
+    $this->assertSame('/entity/entity1/{entity1}', $definition['uri_paths']['canonical']);
 
     // Custom link template.
     $definition = $this->entityDerivative->getDerivativeDefinition('entity2', $base_plugin_definition);
-    $this->assertSame('bar', $definition['foo'], 'The base plugin definition was not properly merged.');
-    $this->assertSame('entity:entity2', $definition['id'], 'The derivative ID was not properly set.');
-    $this->assertSame('valid-router-path', $definition['uri_paths']['canonical'], 'The custom canonical uri was not properly set.');
+    // Plugin definition merge.
+    $this->assertSame('bar', $definition['foo']);
+    // Derivative ID.
+    $this->assertSame('entity:entity2', $definition['id']);
+    // Custom canonical URI is set.
+    $this->assertSame('valid-router-path', $definition['uri_paths']['canonical']);
 
     $definitions = $this->entityDerivative->getDerivativeDefinitions($base_plugin_definition);
     $this->assertArrayHasKey('entity1', $definitions);