Run mocha tests by npm scripts & Remove Gruntfile.js - Closes #2935

[yatki]

What was the problem?

After introducing jest to our codebase, we had 2 test runners which had different api to be executed.

How did I fix it?

• I unified the way we execute tests.
• Removed Gruntfile.js
• Refactor new_migration.js file to remove grunt dependency
• Removed grunt from package.json
• Refactored Jenkinsfiles
• Updated Readme

How to test it?

Please see: https://github.com/LiskHQ/lisk/blob/e06f5c121eef27a13874a48bfc5ca19052d1590e/README.md#running-mocha-tests

Review checklist

• The PR resolves Run mocha tests by npm scripts & Remove Gruntfile.js #2935
• All new code is covered with unit tests
• All new code was formatted with Prettier
• Linting passes
• Tests pass
• Commit messages follow the commit guidelines
• Documentation has been added/updated

[lsilvs]

If I start functional tests I can't stop them

How to reproduce:
npm run mocha:functional -- --grep "@slow|@unstable" --invert
Try to exit (control + c) before it finish

[yatki]

@lsilvs That's because functional tests also spawn child processes. Unfortunately, it's not related to lisk mocha runner, we need to update the functional tests accordingly.

[yatki]

@lsilvs #3098 was created for functional tests issue.

[shuse2]

npm t unit
Error code seems to fail stringifying.

([object Object]):      framework/test/mocha/unit/components/cache/cache.js
([object Object]):      framework/test/mocha/unit/components/storage/entities/account.js
([object Object]):      framework/test/mocha/unit/components/storage/entities/block.js
([object Object]):      framework/test/mocha/unit/components/storage/entities/transaction.js
([object Object]):      framework/test/mocha/unit/modules/chain/components/storage/entitites/account.js
([object Object]):      framework/test/mocha/unit/modules/chain/components/storage/entitites/block.js
([object Object]):      framework/test/mocha/unit/modules/chain/components/storage/entitites/migration.js
([object Object]):      framework/test/mocha/unit/modules/chain/components/storage/entitites/peer.js
([object Object]):      framework/test/mocha/unit/modules/chain/components/storage/entitites/round.js
([object Object]):      framework/test/mocha/unit/modules/chain/components/storage/entitites/transaction.js

[lsilvs]

lgtm

#3078 (comment)