PropertyAccessorCollectionTestCase_CarOnlyAdder example

$this->propertyAccessor->setValue($car, 'axes', $axesAfter);
    }

    public function testIsWritableReturnsTrueIfAdderAndRemoverExists()
    {
        $car = new PropertyAccessorCollectionTestCase_Car();
        $this->assertTrue($this->propertyAccessor->isWritable($car, 'axes'));
    }

    public function testIsWritableReturnsFalseIfOnlyAdderExists()
    {
        $car = new PropertyAccessorCollectionTestCase_CarOnlyAdder();
        $this->assertFalse($this->propertyAccessor->isWritable($car, 'axes'));
    }

    public function testIsWritableReturnsFalseIfOnlyRemoverExists()
    {
        $car = new PropertyAccessorCollectionTestCase_CarOnlyRemover();
        $this->assertFalse($this->propertyAccessor->isWritable($car, 'axes'));
    }

    public function testIsWritableReturnsFalseIfNoAdderNorRemoverExists()
    {