public function testnumber_format() { $string = new williamknauss\String(); $string->set_string(1234.56); $string->number_format(); //assert 1 $this->assertEquals(number_format(1234.56), $string->return_string()); $string = new williamknauss\String(); $string->number_format(1234.56); //assert 2 $this->assertEquals(number_format(1234.56), $string->return_string()); }