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Yamatanooroti

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

Supporting envronments:

  • 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 setup
    start_terminal(5, 30, ['irb', '-f', '--multiline'])
  end

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

  def test_example
    write(":a\n")
    close
    assert_screen(['irb(main):001:0> :a', '=> :a', 'irb(main):002:0>', '', ''])
  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; puts "aaa"; sleep 10; puts "bbb"'
start_terminal(5, 30, ['ruby', '-e', code], startup_message: 'aaa')
close
assert_screen(<<~EOC)
  aaa
EOC
# The start_terminal method waits for the output of the "aaa" as specified by
# the startup_message option, the "bbb" after 10 seconds won't come because
# the I/O is closed immediately after it.

write(str)

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

close

Closes the terminal to take the internal rendering result. You must call it before call assertions.

assert_screen(expected_lines)

Asserts the rendering result of the terminal with expected_lines that should be an Array 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.