public function testjoin() { $my_array = array("Hello", "World"); $string = new williamknauss\String($my_array); $string->join(" "); //assert 1 $this->assertEquals(join(" ", $my_array), $string->return_string()); $string = new williamknauss\String("Hello World"); $string->join(" ", $my_array); //assert 2 $this->assertEquals(join(" ", $my_array), $string->return_string()); }