function test_Coins_returnPennies()
 {
     // arange
     $test_Coins = new Coins();
     $input = 4;
     $input2 = 1;
     // act
     $result = $test_Coins->pennies($input);
     $result2 = $test_Coins->pennies($input2);
     // assert
     $this->assertEquals(4, $result);
     $this->assertEquals(1, $result2);
 }