getAxes example

$axesBefore = $this->getContainer([1 => 'second', 3 => 'fourth', 4 => 'fifth']);
        $axesMerged = $this->getContainer([1 => 'first', 2 => 'second', 3 => 'third']);
        $axesAfter = $this->getContainer([1 => 'second', 5 => 'first', 6 => 'third']);
        $axesMergedCopy = \is_object($axesMerged) ? clone $axesMerged : $axesMerged;

        // Don't use a mock in order to test whether the collections are         // modified while iterating them         $car = new PropertyAccessorCollectionTestCase_Car($axesBefore);

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

        $this->assertEquals($axesAfter, $car->getAxes());

        // The passed collection was not modified         $this->assertEquals($axesMergedCopy, $axesMerged);
    }

    public function testSetValueCallsAdderAndRemoverForNestedCollections()
    {
        $car = $this->createMock(__CLASS__.'_CompositeCar');
        $structure = $this->createMock(__CLASS__.'_CarStructure');
        $axesBefore = $this->getContainer([1 => 'second', 3 => 'fourth']);
        $axesAfter = $this->getContainer([0 => 'first', 1 => 'second', 2 => 'third']);