Test methods of Abstract Class with PHPUnit

Question

I have an abstract class that has common methods in it, that I wish to test, so I do not have to keep testing them in each class that extends this class.

abstract class Class1 implements iClass1 { const VALUE = 'A'; private $Return; public function __construct($Field = NULL) { if( ! is_null($Field) ) $this->SetField($Field); } public function GetField() { return $this->Return; } public function SetField($Field) { if (strlen($Field) != 3) throw new CLASS1_EXCEPTION('Field "' . $Field . '" must be 3 digits.'); $this->Return = $FieldCode; } abstract function CalculateData(); }

I want to create the basic test case then that will test the constructor, and the GetField and other functions, then my other test files can test the abstract functions.

I want to be able to test the const has not changed, the field throws the exception etc...

TEST:

class TEST_CLASS1 extends PHPUnit_Framework_TestCase { protected function setUp() { require_once('CLASS1.php'); } public function testConstants() { $this->assertEquals(CLASS1, 'A'); } /* @expectedException CLASS1_EXCEPTION public function testLargeFieldException() { $class1 = new CLASS1('ABCD'); $class1 = new CLASS1(); $class1->SetField('ABCD'); } }

How do I create the tests since I can not create the CLASS1 object as it is an abstract class?

possible duplicate of PHPUnit - Testing abstract Classes

David Harkness
– David Harkness

2012-04-03 23:31:25 +00:00
Commented Apr 3, 2012 at 23:31 — David Harkness
– David Harkness, Commented Apr 3, 2012 at 23:31

edorian · Accepted Answer · 2012-03-30 13:05:34Z

One option is to create a

TestableClass1 extends Class1 { public function CalculateData() {} }

and use that class for your tests.

The other option is to do pretty much the same but use an API phpunit provides you with:

For this see the sample Example 10.13: Testing the concrete methods of an abstract class of the phpunit documentation:

A simpler example:

abstract class AbstractClass { public function concreteMethod() { return 5; } public abstract function abstractMethod(); } class AbstractClassTest extends PHPUnit_Framework_TestCase { public function testConcreteMethod() { $sut = $this->getMockForAbstractClass('AbstractClass'); $this->assertSame(5, $sut->concreteMethod()); } }

Thanks for the suggestions. I will try the bigger code example above, without trying to implement the testable class for fear of them getting out of sync.

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