mocha.el

Emacs helpers for running mocha tests. It lets you test an entire project, a particular file, or a particular test in that file.

Contents

• Installation
• Configuration
• Running Tests
• Running Test at Point
• Debugging Tests

Installation

The package can be installed via MELPA. The package name is mocha.

Configuration

Everything is set up right now to be configured via customize or per project in a .dir-locals.el file. You can find all options by looking at the mocha group in the customize interface. Below is an example configuration:

((nil . (
            (mocha-which-node . "/Users/ajs/.nvm/versions/node/v4.2.2/bin/node")
            (mocha-command . "node_modules/.bin/mocha")
            (mocha-environment-variables . "NODE_ENV=test")
            (mocha-options . "--recursive --reporter dot -t 5000")
            (mocha-project-test-directory . "test")
            (mocha-reporter . "spec")
            )))

Running tests

In order to run tests there are three functions exposed:

1. mocha-test-project will run all the tests in your project.
2. mocha-test-file will test just the current file you are visiting.
3. mocha-test-at-point will try and semantically find the nearest enclosing it or describe from your cursor, and just run that.

You can run any of these functions via M-x, or assign them to hotkeys.

Stack traces for failing tests have clickable links to the file and line that failed.

Running Test at Point

mocha-test-at-point uses js2-mode to find the nearest describe or it and extract the description string from it. As such, it only works in JavaScript files that have js2-mode set as the major mode.

Debugging Tests

Each of the test functions has a debug analog: mocha-debug-project, mocha-debug-file, and mocha-debug-at-point. Using these functions depends on having realgud installed and loaded.

The provided debugging buffer takes the same commands as the standard node CLI debugger. Some useful ones are:

• s to step in
• o to step out
• n to step over
• c to continue execution
• repl use interactive REPL at point

Additionally C-c C-c will send a BREAK signal, and M-p will cycle through previous inputs.

Contribution

Be sure to!

Install Cask if you haven't already.

Install the dependencies:

$ make install

Run the tests with:

$ make test