如何在Yii中模拟ActiveRecord对象？

Question

In Yii I want to perform some unit tests on a class that uses ActiveRecord objects. For example, I have a Translation ActiveRecord. When I try to create a mock object for it I get an error.

In my test I have the line:

$translation = $this->getMock("Translation");

And then I get this error when I run my test:

PHPUnit 3.7.30 by Sebastian Bergmann.

Configuration read from /Users/riverstyx/Sites/protected/tests/phpunit.xml

E.

Time: 1.27 seconds, Memory: 6.25Mb

There was 1 error:

1) TranslationManagerTest::testCreateNewTranslation
Trying to get property of non-object

/Users/riverstyx/yii/framework/db/ar/CActiveRecord.php:79
/Users/riverstyx/Sites/protected/tests/unit/TranslationManagerTest.php:8

FAILURES!
Tests: 2, Assertions: 0, Errors: 1

I understand the concept of using fixtures in Yii however I don't want to have to rely on a database to do my testing. We use MySQL in production, so creating a temporary in-memory SQLITE database seems weird because it doesn't match our actual MySQL environment and also there are some syntax nuances (ie. UTC_TIMESTAMP() doesnt exist in SQLITE).

Ideally (as with all unit tests I guess), I want to test my TranslationManager class in isolation from the active record.

Any help would be appreciated :)

Answer 1

Figured it out...

$this->getMockBuilder("Translation")
     ->setMethods(array("getIsNewRecord", "save"))
     ->disableOriginalConstructor()
     ->getMock();

Where "Translation" is the name of my active record model. You MUST use setMethods to identify the methods you're going to be mocking so that the rest of the methods belonging to the active record will remain intact. This is important so that the default __get and __set magic methods will still work properly.

"disableOriginalConstructor" is required to properly construct the activerecord object