MochaLiveScript

MochaLiveScript is a bridge library that enables tests written in LiveScript to run under the Mocha test framework. It acts as an adapter that translates LiveScript test syntax and Mocha’s interfaces into a form Mocha can execute, typically by compiling LiveScript source to JavaScript either ahead of time or at test load time. The project aims to combine Mocha’s flexible interface with LiveScript’s concise syntax, providing a cohesive workflow for testing LiveScript code.

Design and features: It provides a compatibility layer that maps LiveScript constructs such as describe, it, before, after into Mocha constructs. It supports Mocha reporters, hooks, and asynchronous tests via callbacks or promises. It can preserve error traces through sourcemaps and is intended to work with current Mocha releases, subject to the LiveScript compiler’s compatibility. Typical usage supports both precompiled tests and on-the-fly compilation, allowing developers to choose the workflow that fits their project.

Installation and usage: Install via npm or yarn as a dedicated package, then configure Mocha to load LiveScript tests either by precompiling .ls files to JavaScript or by enabling on-the-fly compilation through the library’s require hook or preprocessor. A common workflow is to write tests in LiveScript with the .ls extension and run Mocha with a command that activates the bridge, such as running the tests directly after installation.

Example (LiveScript):

describe 'Array', ->

it 'length of empty array is 0', ->

assert.equal [], .length, 0

Limitations and status: As a niche integration, MochaLiveScript depends on both the Mocha ecosystem and the LiveScript compiler. Some Mocha features or newer versions may require updates to the bridge. Community support and maintenance can vary, and developers may opt to precompile tests or use alternative transpilation strategies when needed.

See also: Mocha (test framework), LiveScript, CoffeeScript, JavaScript testing, transpilers.