diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
index a750c12..1788e5a 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
@@ -553,7 +553,7 @@ public function testGetBaseFieldDefinitionsInvalidDefinition() {
   }
 
   /**
-   * Tests the getFieldDefinitions() method.
+   * Tests that getFieldDefinitions() method sets the 'provider' definition key.
    *
    * @covers ::getFieldDefinitions()
    */
diff --git a/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php b/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php
index 309d99a..785f3b5 100644
--- a/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php
@@ -202,4 +202,26 @@ public function testFieldConfigurable() {
     $this->assertFalse($definition->isConfigurable());
   }
 
+  /**
+   * Tests provider.
+   */
+  public function testFieldProvider() {
+    $definition = FieldDefinition::create($this->fieldType);
+    $provider = $this->randomName();
+    $definition->setProvider($provider);
+    $this->assertEquals($provider, $definition->getProvider());
+  }
+
+  /**
+   * Tests custom storage.
+   */
+  public function testCustomStorage() {
+    $definition = FieldDefinition::create($this->fieldType);
+    $this->assertFalse($definition->hasCustomStorage());
+    $definition->setCustomStorage(TRUE);
+    $this->assertTrue($definition->hasCustomStorage());
+    $definition->setCustomStorage(FALSE);
+    $this->assertFalse($definition->hasCustomStorage());
+  }
+
 }