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Yamatanooroti

Yamatanooroti is a multi-platform real(?) terminal testing framework.

Supporting environments:

  • vterm gem
  • Windows command prompt

Usage

You can test the executed result and its rendering on the automatically detected environment that you have at the time, by code below:

require 'yamatanooroti'

class MyTest < Yamatanooroti::TestCase
  def test_example
    start_terminal(5, 30, ['irb', '-f', '--multiline'])
    write(":a\n")
    assert_screen(['irb(main):001:0> :a', '=> :a', 'irb(main):002:0>', '', ''])
    close
  end
end

This code detects some real(?) terminal environments:

  • vterm gem (you should install beforehand)
  • Windows (you should run on command prompt)

If any real(?) terminal environments not found, it will fail with a message:

$ rake
Traceback (most recent call last):
        (snip traceback)
/path/to/yamatanooroti/lib/yamatanooroti.rb:71:in `inherited': Any real(?) terminal environments not found. (LoadError)
Supporting real(?) terminals:
- vterm gem
- Windows
rake aborted!
Command failed with status (1)

Tasks: TOP => default => test
(See full trace by running task with --trace)

Advanced Usage

If you want to specify vterm environment that needs vterm gem, you can use Yamatanooroti::VTermTestCase:

require 'yamatanooroti'

class MyTest < Yamatanooroti::VTermTestCase
  def test_example
    start_terminal(5, 30, ['irb', '-f', '--multiline'])
    write(":a\n")
    assert_screen(['irb(main):001:0> :a', '=> :a', 'irb(main):002:0>', '', ''])
    close
  end
end

If you haven't installed vterm gem, this code will fail with a message You need vterm gem for Yamatanooroti::VTermTestCase (LoadError).

Likewise, you can specify Windows command prompt test by Yamatanooroti::WindowsTestCase.

Method Reference

start_terminal(height, width, command, startup_message: nil)

Starts terminal internally that is sized height and width with command to test the result. The command should be an array of strings with a path of command and zero or more options. This should be called in setup method.

If startup_message is given, start_terminal waits for the string to be printed and then returns.

code = 'sleep 1; print "prompt>"; s = gets; sleep 1; puts s.upcase'
start_terminal(5, 30, ['ruby', '-e', code], startup_message: 'prompt>')
# Screen is already "prompt>"
write "hello\n"
assert_screen(<<~EOC)
  prompt>hello
  HELLO
EOC
close

write(str)

Writes str like inputting by a keyboard to the started terminal.

close

Closes the terminal and terminates the process.

assert_screen(expected_lines)

Asserts the rendering result of the terminal with expected_lines that should be an Array, Regexp, or a String of lines. The Array contains blank lines and doesn't contain newline characters, and the String contains newline characters at end of each line and doesn't contain continuous last blank lines.

License

The gem is available as open source under the terms of the MIT License.