--- /dev/null
+<?php
+
+namespace Drupal\Tests\ctools\Kernel;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Plugin\Context\Context;
+use Drupal\Core\Plugin\Context\ContextDefinition;
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\user\Entity\User;
+
+/**
+ * @coversDefaultClass \Drupal\ctools\TypedDataResolver
+ *
+ * @group CTools
+ */
+class TypedDataResolverTest extends KernelTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['user', 'system', 'entity_test', 'ctools'];
+
+ /**
+ * @var \Drupal\ctools\TypedDataResolver
+ */
+ protected $typedDataResolver;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+
+ $this->installSchema('system', 'sequences');
+ $this->installEntitySchema('user');
+
+ $this->typedDataResolver = \Drupal::service('ctools.typed_data.resolver');
+ }
+
+ /**
+ * Tests context extraction from properties.
+ */
+ public function testGetContextFromProperty() {
+ // Create a user and test entity to extract context from.
+ $user = User::create(['uid' => 2, 'name' => 'username', 'mail' => 'mail@example.org']);
+ $user->enforceIsNew(TRUE);
+ $user->save();
+ $entity_test = EntityTest::create(['user_id' => $user->id(), 'name' => 'Test name']);
+
+ // Test the language property.
+ $property_context = $this->assertPropertyPath($entity_test, 'langcode:language', 'language');
+ $this->assertEquals('en', $property_context->getContextValue()->getId());
+
+ // Test the reference to the user.
+ $property_context = $this->assertPropertyPath($entity_test, 'user_id:entity', 'entity:user');
+ $this->assertEquals($user->id(), $property_context->getContextValue()->id());
+
+ // Test the reference to the name.
+ $property_context = $this->assertPropertyPath($entity_test, 'name:value', 'string');
+ $this->assertEquals('Test name', $property_context->getContextValue());
+
+ // Test explicitly specifying the delta.
+ $property_context = $this->assertPropertyPath($entity_test, 'name:0:value', 'string');
+ $this->assertEquals('Test name', $property_context->getContextValue());
+
+ // Test following the reference.
+ $property_context = $this->assertPropertyPath($entity_test, 'user_id:entity:mail:value', 'email');
+ $this->assertEquals('mail@example.org', $property_context->getContextValue());
+ }
+
+ /**
+ * Asserts that a context for the given property path can be derived.
+ *
+ * @param \Drupal\Core\Entity\ContentEntityInterface $entity
+ * The entity to test with.
+ * @param $property_path
+ * The property path to look for.
+ * @param $expected_data_type
+ * The expected data type.
+ *
+ * @return \Drupal\Core\Plugin\Context\ContextInterface
+ * The context with a value.
+ */
+ protected function assertPropertyPath(ContentEntityInterface $entity, $property_path, $expected_data_type) {
+ $typed_data_entity = $entity->getTypedData();
+ $context_definition = new ContextDefinition($typed_data_entity->getDataDefinition()->getDataType());
+ $context_with_value = new Context($context_definition, $typed_data_entity);
+ $context_without_value = new Context($context_definition);
+
+ // Test the context without value.
+ $property_context = $this->typedDataResolver->getContextFromProperty($property_path, $context_without_value);
+ $this->assertEquals($expected_data_type, $property_context->getContextDefinition()->getDataType());
+
+ // Test the context with value.
+ $property_context = $this->typedDataResolver->getContextFromProperty($property_path, $context_with_value);
+ $this->assertEquals($expected_data_type, $property_context->getContextDefinition()->getDataType());
+
+ // Return the context with value so it can be asserted.
+ return $property_context;
+ }
+
+}