reverse_string.rb

# input is "hello", function should return "olleh"
def reverse_string(input)
  begin
    if input
      modified_input = input.to_s
      str_size = (modified_input.size - 1)
      end_string = []
      modified_input.each_char do |this|
        end_string[str_size] = this
        str_size -= 1
      end
      end_string.to_s
    else
      return nil
    end
  rescue
    false
  end
end

# test functions
# each function returns true if the test passes, and false if it fails


def test_reverse_string_function
  begin
    test_string = "hello"
    expected_result = "olleh"
    return reverse_string(test_string) == expected_result
  rescue
    false
  end
end

def test_reverse_string_function_empty_string
  begin
    return reverse_string("") == ""
  rescue
    false
  end
end

def test_reverse_string_function_full_sentence
  begin
    test_string = "this is a full sentence"
    expected_result = "ecnetnes lluf a si siht"
    return reverse_string(test_string) == expected_result
  rescue
    false
  end
end

def test_reverse_string_function_handles_integer
  begin
    return reverse_string(789) == "987"
  rescue
    false
  end
end

def test_reverse_string_function_handles_nil
  begin
    return reverse_string(nil) == nil
  rescue
    false
  end
end