How do you write a unit test of methods that needs user inpu

ruby-talk
1

Will I need to change my code or is there a way for me to write my unit
test that automatically enters some inputs?

Idealy, I'd like to do it so that when I run my unit test, It'll ask me
for the inputs. Right now it just goes thru the code without asking me
for the inputs.

THanks

···

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2

pood.forums wrote:

Will I need to change my code or is there a way for me to write my unit
test that automatically enters some inputs?

Get with Mocha, a mock-object library. Then mock the method that returns
user input, and put whatever the test needs into it.

Idealy, I'd like to do it so that when I run my unit test, It'll ask me
for the inputs. Right now it just goes thru the code without asking me
for the inputs.

Okay, this is different. If it's interative, it's not an automated test. If
you to test many different inputs, put them into a table and loop over the
table each time you test.

Make the table easy to edit, such as a YAML file.

See "FIT" and "Fitnesse" for good GUIs on these tables of test data. Then
invent your own, Ruby-style, without devolving into FIT's sounce code!

···

--
  Phlip

3

Feng Tien wrote:

Will I need to change my code or is there a way for me to write my unit
test that automatically enters some inputs?

It's somewhat difficult. This works for me:

my_program.rb:

···

--------------
def get_input
  while true
    print "Enter a non-zero integer greater than -5: "
    num = gets

    num_int = num.to_i
    num_float = num.to_f

    if num_int != num_float
      puts "You entered a float. Try again."
    elsif num_int <= -5
      puts "You entered a number that was too small."
    elsif num_int == 0
      puts "You entered 0 or a word. That is not allowed."
    else
      return num_int
    end

  end
end

if __FILE__ == $0
  result = get_input
  puts "You entered #{result}. Thank you."
end

my_program_UnitTest.rb
--------------
require 'my_program'
require 'test/unit'
require 'stringio'

class TestMyProgram < Test::Unit::TestCase

  def setup
    $stdin = DATA #DATA is like a file containing the stuff after
__END__
    trash_can = StringIO.new
    $stdout = trash_can

    #If you want to see the prompts shown to the user as part of
    #the unit test output and/or be able to send output to your
    #terminal for debugging, comment out the previous line.
  end

  def teardown
    $stdin = STDIN
    $stdout = STDOUT
  end

  def test_get_input
      while not DATA.eof?
        num = get_input

        num_int = num.to_i
        num_float = num.to_f

        assert_not_equal(0, num_int)
        assert(num_int > -5, "The number was not greater than -5.")
        assert_equal(num_int, num_float)
      end
  end
end

__END__
-6
-4
0
2.5
6 #Must end the data with a good number--otherwise get_input will
    #run out of data, causing gets in get_input to return nil, which
will
    #cause get_input to go into an infinite loop.

Idealy, I'd like to do it so that when I run my unit test, It'll ask me
for the inputs.

After typing in 5 - 10 different numbers into the command line for hours
on end, you will probably think differently about testing code by hand.
In fact, if you are going to test code by hand, you don't need unit
testing. Unit testing is designed to enable you to test your program by
driving it with another program. That allows you to do tests relatively
quickly and thoroughly--and the tests are repeatable.
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