public function testCanSortKeys() { $under = Arr::sortKeys(['z' => 0, 'b' => 1, 'r' => 2]); $this->assertEquals(['b' => 1, 'r' => 2, 'z' => 0], $under); $under = Arr::sortKeys(['z' => 0, 'b' => 1, 'r' => 2], 'desc'); $this->assertEquals(['z' => 0, 'r' => 2, 'b' => 1], $under); }