Mutation tests

In this repo, i used the lib stryker to applay some concepts of mutation tests.

Getting Started

To get success with the tests, you need to follow this steps

Ensure you have the node and npm installed on your machine.

1. Clone this repo.
2. checkout on branch master
3. Run the follow command: npm i
4. Run the test: npm run test

You'll see the test coverage is 100%, but now, we'll run the mutation test.

1. checkout on branch stryker
2. Run the follow command: npm install -g stryker-cli, it will install stryker globally.
3. Run the mutation test: stryker run

Note the mutation tests show 60% of coverage in mutant.

1. checkout on branch kill-mutants
2. Run the mutation test again: stryker run

Now we have 100% of coverage in mutant.

During the checkouts, look the diferences in 'index.test.js'

Some questions? Let me know, eliasreis54@gmail.com. =)