gistfile1.php

<?php

class ClassUnderTest {
	private $table;
	
	public function __construct( $table ) {
		$this->table = $table;
	}
	
	public function lookup($key) {
		$entry = $this->table->lookup($key);
		if( ! $entry ) throw new Exception('Unknown key');
		return $entry;
	}
}

class TableClass {
	public function lookup( $key ) {
		// Stub..
	}
}


class ExampleStubTest extends PHPUnit_Framework_TestCase {
	private $correct_stub;
	
	public function setUp() {
		$this->correct_stub = $this->getMock('TableClass');
		$this->correct_stub->expects($this->any())
			->method('lookup')
			->with( 'foo' )
			->will( $this->returnValue('bar') );
	}
	
	public function testSuccessfullLookup() {
		$testclass = new ClassUnderTest( $this->correct_stub );
		$this->assertEquals('bar', $testclass->lookup('foo'));
	}
	
	public function testFailingLookup() {
		$stub_with_missing_entry = $this->getMock('TableClass');
		$stub_with_missing_entry->expects($this->any())
			->method('lookup')
			->with( 'foo' )
			->will( $this->returnValue( NULL ));
			
		$testclass = new ClassUnderTest( $stub_with_missing_entry );
		
		$this->setExpectedException('Exception');
		$testclass->lookup('bar');
	}
}