/**
* Verify that subtraction fails with vectors whose components' keys don't
* match.
*
* @test
* @uses \Nubs\Vectorix\Vector::__construct
* @uses \Nubs\Vectorix\Vector::components
* @uses \Nubs\Vectorix\Vector::dimension
* @uses \Nubs\Vectorix\Vector::add
* @uses \Nubs\Vectorix\Vector::multiplyByScalar
* @uses \Nubs\Vectorix\Vector::isSameDimension
* @uses \Nubs\Vectorix\Vector::isSameVectorSpace
* @uses \Nubs\Vectorix\Vector::_checkVectorSpace
* @covers ::subtract
* @covers ::_checkVectorSpace
* @expectedException Exception
* @expectedExceptionMessage The vectors' components must have the same keys
*/
public function subtractVectorsWithDifferentlyKeyedComponents()
{
$a = new Vector([4, 5, 6]);
$b = new Vector(['x' => 1, 'y' => 2, 'z' => 3]);
$a->subtract($b);
}
