public function testTransformWillReturnValue() { $transformation = new \Chippyash\Math\Matrix\Transformation\Invert(); $testArray = [[1, 2, 3], [3, 2, 1], [2, 1, 3]]; $mA = new NumericMatrix($testArray); $this->assertInstanceOf(self::NSUT, $mA->transform($transformation)); }