Transmute is a binary that works alone or in coordination with coverage formatter to report test quality. It will change your code and make the tests fail. If don't, we will raise it for you.

Any software requires well-written tests. This is where transmute steps in.

The key features of transmute are:

• Mutate: Arbitrary code can be changed.

  Mutates booleans, numbers, strings, symbols, ranges, regexes and branches (if, while, unless, until) can be changed in order to make your specs fail.

• Dynamic: Automatically run the tests

  Provide how to run the tests and transmute will run it..

• Coverage: Transmute will run just the affected tests.

  Instead of running all the specs, we will run only the required specs. This is good to provide a quick feedback-loop.

• Insights: If the tests didn't fail, we will provide the information that you need to write a new tests case.

$ transmute \
  --files "app/models/**/*.rb" \
  --coverage "transmute.json" \
  --command "rspec {file}" \
  --formatter "html" \
  --log-level "trace"

Coverage is a file generated by the coverage formatter. We are building integration for the most used test libraries.

It is a good practice to provide the coverage.json file. It is very simple: For each implementation file, we have all the specs that touches it. With that in hand, we don't need to run all specs in order to test one constant mutation.

I ❤️ Open source!

git clone git@github.com:vgsantoniazzi/transmute.git

make build

make test

make run.dummy

make format

Follow github guides for forking a project

Follow github guides for contributing open source

Squash pull request into a single commit

Transmute is released under the GNU license.