diff --git a/apps/basic/tests/unit/models/UserTest.php b/apps/basic/tests/unit/models/UserTest.php
index 3ff3c831ed..109da730d3 100644
--- a/apps/basic/tests/unit/models/UserTest.php
+++ b/apps/basic/tests/unit/models/UserTest.php
@@ -3,12 +3,9 @@
 namespace tests\unit\models;
 
 use yii\codeception\TestCase;
-use yii\test\DbTestTrait;
 
 class UserTest extends TestCase
 {
-	use DbTestTrait;
-
 	protected function setUp()
 	{
 		parent::setUp();
diff --git a/docs/guide/authorization.md b/docs/guide/authorization.md
index 568b3b46ad..df40f2fae4 100644
--- a/docs/guide/authorization.md
+++ b/docs/guide/authorization.md
@@ -57,10 +57,10 @@ class SiteController extends Controller
 		return [
 			'access' => [
 				'class' => \yii\web\AccessControl::className(),
-				'only' => ['special'],
+				'only' => ['special-callback'],
 				'rules' => [
 					[
-						'actions' => ['special'],
+						'actions' => ['special-callback'],
 						'allow' => true,
 						'matchCallback' => function ($rule, $action) {
 							return date('d-m') === '31-10';
@@ -68,6 +68,17 @@ class SiteController extends Controller
 					],
 ```
 
+And the action:
+
+```php
+	// ...
+	// Match callback called! This page can be accessed only each October 31st
+	public function actionSpecialCallback()
+	{
+		return $this->render('happy-halloween');
+	}
+```
+
 Sometimes you want a custom action to be taken when access is denied. In this case you can specify `denyCallback`.
 
 Role based access control (RBAC)
diff --git a/docs/internals/report-an-issue.md b/docs/internals/report-an-issue.md
index a41153a3f4..99c9aa31b6 100644
--- a/docs/internals/report-an-issue.md
+++ b/docs/internals/report-an-issue.md
@@ -1,14 +1,17 @@
-Creating issues
+Report an Issue
 ===============
 
-You got into rough corner while working with yii, or you found a bug? We are very sorry for that, but we can sort that
-out together.
+Please follow the guidelines below when creating an issue so that your issue can be more promptly resolved:
 
-- If you are unsure about a function, you may ask on IRC or the forums. If the documentation is unclear, open a separate
-  issue.
-- Please use English if possible.
-- Make sure it is clear what is the problem and how to reproduce it.
+* Provide information including: the version of PHP and Yii, the type of operating system and Web server, browser type and version;
+* Provide the **complete** error call stack if available. A screenshot to explain the issue is very welcome.
+* Describe the steps for reproducing the issue. It would be even better if you could provide code to reproduce the issue.
 
-If you are going to report security issue please **do not** use the issue tracker and instead
-[contact us directly](http://www.yiiframework.com/security/).
+**Do not report an issue if**
 
+* you are asking how to use some Yii feature. You should use [the forum](http://www.yiiframework.com/forum/index.php/forum/42-general-discussions-for-yii-20/) or [chat room](http://www.yiiframework.com/chat/) for this purpose.
+* your issue is about security. Please [contact us directly](http://www.yiiframework.com/security/) to report security issues.
+
+**Avoid duplicated issues**
+
+Before you report an issue, please search through [existing issues](https://github.com/yiisoft/yii2/issues) to see if your issue is already reported or fixed to make sure you are not reporting a duplicated issue. Also make sure you have the latest version of Yii and see if the issue still exists.
diff --git a/framework/classes.php b/framework/classes.php
index 1dfc40a2d2..ea50822b22 100644
--- a/framework/classes.php
+++ b/framework/classes.php
@@ -174,7 +174,6 @@ return [
 	'yii\rbac\Manager' => YII_PATH . '/rbac/Manager.php',
 	'yii\rbac\PhpManager' => YII_PATH . '/rbac/PhpManager.php',
 	'yii\requirements\YiiRequirementChecker' => YII_PATH . '/requirements/YiiRequirementChecker.php',
-	'yii\test\DbTestTrait' => YII_PATH . '/test/DbTestTrait.php',
 	'yii\validators\BooleanValidator' => YII_PATH . '/validators/BooleanValidator.php',
 	'yii\validators\CompareValidator' => YII_PATH . '/validators/CompareValidator.php',
 	'yii\validators\DateValidator' => YII_PATH . '/validators/DateValidator.php',
diff --git a/framework/test/ActiveFixture.php b/framework/test/ActiveFixture.php
index 30c1f1a248..c86b9d35cd 100644
--- a/framework/test/ActiveFixture.php
+++ b/framework/test/ActiveFixture.php
@@ -100,16 +100,13 @@ class ActiveFixture extends BaseActiveFixture
 	 */
 	protected function getData()
 	{
-		if ($this->dataFile === false) {
-			return [];
-		}
-		if ($this->dataFile !== null) {
-			$dataFile = Yii::getAlias($this->dataFile);
-		} else {
+		if ($this->dataFile === null) {
 			$class = new \ReflectionClass($this);
 			$dataFile = dirname($class->getFileName()) . '/data/' . $this->getTableSchema()->fullName . '.php';
+			return is_file($dataFile) ? require($dataFile) : [];
+		} else {
+			return parent::getData();
 		}
-		return is_file($dataFile) ? require($dataFile) : [];
 	}
 
 	/**
diff --git a/framework/test/BaseActiveFixture.php b/framework/test/BaseActiveFixture.php
index 26c4f75879..35240fdb9c 100644
--- a/framework/test/BaseActiveFixture.php
+++ b/framework/test/BaseActiveFixture.php
@@ -30,6 +30,11 @@ abstract class BaseActiveFixture extends DbFixture implements \IteratorAggregate
 	 * @var array the data rows. Each array element represents one row of data (column name => column value).
 	 */
 	public $data = [];
+	/**
+	 * @var string|boolean the file path or path alias of the data file that contains the fixture data
+	 * to be returned by [[getData()]]. You can set this property to be false to prevent loading any data.
+	 */
+	public $dataFile;
 	/**
 	 * @var \yii\db\ActiveRecord[] the loaded AR models
 	 */
@@ -66,4 +71,37 @@ abstract class BaseActiveFixture extends DbFixture implements \IteratorAggregate
 		}
 		return $this->_models[$name] = $modelClass::find($keys);
 	}
+
+	/**
+	 * Loads the fixture.
+	 *
+	 * The default implementation simply stores the data returned by [[getData()]] in [[data]].
+	 * You should usually override this method by putting the data into the underlying database.
+	 */
+	public function load()
+	{
+		$this->data = $this->getData();
+	}
+
+	/**
+	 * Returns the fixture data.
+	 *
+	 * The default implementation will try to return the fixture data by including the external file specified by [[dataFile]].
+	 * The file should return the data array that will be stored in [[data]] after inserting into the database.
+	 *
+	 * @return array the data to be put into the database
+	 * @throws InvalidConfigException if the specified data file does not exist.
+	 */
+	protected function getData()
+	{
+		if ($this->dataFile === false || $this->dataFile === null) {
+			return [];
+		}
+		$dataFile = Yii::getAlias($this->dataFile);
+		if (is_file($dataFile)) {
+			return require($dataFile);
+		} else {
+			throw new InvalidConfigException("Fixture data file does not exist: {$this->dataFile}");
+		}
+	}
 }