public function testCanCalculateAverageValue() { $average1 = [5, 10, 15, 20]; $average2 = ['foo', 'b', 'ar']; $average3 = [['lol'], 10, 20]; $average1 = Arr::average($average1); $average2 = Arr::average($average2); $average3 = Arr::average($average3); $this->assertEquals(13, $average1); $this->assertEquals(0, $average2); $this->assertEquals(10, $average3); }