public function testCalculateDistanceForThreeDimensionsWithDifferentLambda() { $distanceMetric = new Minkowski($lambda = 5); $a = [6, 10, 3]; $b = [2, 5, 5]; $expectedDistance = 5.3; $actualDistance = $distanceMetric->distance($a, $b); $this->assertEquals($expectedDistance, $actualDistance, '', $delta = 0.001); }