Also posted here (http://stackoverflow.com/questions/22104314/php-mockery-throwing-unexpected-must-implement-interface-exception-when-functi). I'm using Mockery to unit test an admittedly edge case. It's failing and I don't think it should fail, so there could be a bug within Mockery. Consider an object that has a method. The method has an argum…

Mockery throws "must be instance of" exception when it shouldn't

<?php

use PHPUnit_Framework_TestCase;
use Mockery;

class SomeTest extends PHPUnit_Framework_TestCase {

	function testRealFooObject_BarImplementation_NotThrowingException()
	{
		$foo = new FooObject;
		$bar = new BarImplemention;
		$baz = 'baz';

		$result = $foo->barFunction($bar, $baz);

		$this->assertEquals($bar, $result);
	}

	function testRealFooObject_Null_NotThrowingException()
	{
		$foo = new FooObject;
		$bar = null;
		$baz = 'baz';

		$result = $foo->barFunction(null, $baz);

		$this->assertNull($result);
	}

	function testMockedFooObject_BarImplementation_NotThrowingException()
	{
		$mockFoo = Mockery::mock('FooObject')->shouldIgnoreMissing();
		$bar = new BarImplemention;
		$baz = 'baz';

		$result = $mockFoo->barFunction($bar, $baz);

		$this->assertNull($result);
	}

	function testMockedFooObject_Null_IsThrowingExceptionButShouldnt()
	{
		$mockFoo = Mockery::mock('FooObject')->shouldIgnoreMissing();
		$bar = null;
		$baz = 'baz';

		$result = $mockFoo->barFunction($bar, $baz);

		$this->assertNull($result);
	}

	function testMockedPooObject_Null_NotThrowingExceptionBecauseSecondParamHasDefault()
	{
		$mockPoo = Mockery::mock('PooObject')->shouldIgnoreMissing();
		$bar = null;
		$baz = 'baz';

		$result = $mockPoo->barFunction($bar, $baz);

		$this->assertNull($result);
	}

}

class BarImplemention {
}

class FooObject {

	public function barFunction(BarImplemention $bar = null, $baz)
	{
		return $bar;
	}
}

class PooObject {

	public function barFunction(BarImplemention $bar = null, $baz = null)
	{
		return $bar;
	}

}