How can I run one spec 100 times using the command line?

Question

We're getting intermittent failures.

Hope can I run one test 100 times to see how 'stable' it is?

Answer 1

If you are using zsh shell:

repeat 10 { command }

On basic shell:

for _ in {1..10} do command; done

If you can run the tests in parallel, you can use the GNU Parallel:

parallel command ::: {1..1000}

Tutorial videos: https://www.youtube.com/playlist?list=PL284C9FF2488BC6D1

Text tutorial: http://www.gnu.org/software/parallel/parallel_tutorial.html

Your test framework probably has some functionality to rerun failed tests. Behat, for instance, has a --rerun option.

Answer 2

Create a script in your home directory, e.g.

  $ cat run_spec_100_times.sh

    cd ~/eq/lynx
    for i in `seq 1 100`;
      do
        rspec spec/features/survey_spec.rb
      done
    cd ~

Modify the script to be executable with chmod +x run_spec_100_times.sh

The use it with . run_spec_100_times.sh