+ $this->assertIdentical('link', $plugin_manager->getPluginIdFromFieldType('link', ['core' => 6]));
+ $this->assertIdentical('link_field', $plugin_manager->getPluginIdFromFieldType('link_field', ['core' => 7]));
+ $this->assertIdentical('image', $plugin_manager->getPluginIdFromFieldType('image', ['core' => 7]));
+ $this->assertIdentical('file', $plugin_manager->getPluginIdFromFieldType('file', ['core' => 7]));