Building and testing
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====================
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To actually run highlight.js it is necessary to build it for the environment
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where you're going to run it: a browser, the node.js server, etc.
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Building
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--------
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The build tool is written in JavaScript using node.js. Before running the
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script, make sure to have node installed and run ``npm install`` to get the
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dependencies.
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The tool is located in ``tools/build.js``. A few useful examples:
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* Build for a browser using only common languages::
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node tools/build.js :common
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* Build for node.js including all available languages::
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node tools/build.js -t node
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* Build two specific languages for debugging, skipping compression in this case::
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node tools/build.js -n python ruby
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On some systems the node binary is named ``nodejs``; simply replace ``node``
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with ``nodejs`` in the examples above if that is the case.
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The full option reference is available with the usual ``--help`` option.
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The build result will be in the ``build/`` directory.
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.. _basic-testing:
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Basic testing
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-------------
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The usual approach to debugging and testing a language is first doing it
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visually. You need to build highlight.js with only the language you're working
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on (without compression, to have readable code in browser error messages) and
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then use the Developer tool in ``tools/developer.html`` to see how it highlights
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a test snippet in that language.
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A test snippet should be short and give the idea of the overall look of the
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language. It shouldn't include every possible syntactic element and shouldn't
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even make practical sense.
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After you satisfied with the result you need to make sure that language
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detection still works with your language definition included in the whole suite.
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Testing is done using `Mocha <http://mochajs.org/>`_ and the
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files are found in the ``test/`` directory. You can use the node build to
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run the tests in the command line with ``npm test`` after installing the
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dependencies with ``npm install``.
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**Note**: for Debian-based machine, like Ubuntu, you might need to create an
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alias or symbolic link for nodejs to node. The reason for this is the
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dependencies that are requires to test highlight.js has a reference to
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"node".
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Place the snippet you used inside the browser in
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``test/detect/<language>/default.txt``, build the package with all the languages
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for node and run the test suite. If your language breaks auto-detection, it
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should be fixed by :ref:`improving relevance <relevance>`, which is a black art
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in and of itself. When in doubt, please refer to the discussion group!
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Testing markup
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--------------
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You can also provide additional markup tests for the language to test isolated
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cases of various syntactic construct. If your language has 19 different string
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literals or complicated heuristics for telling division (``/``) apart from
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regexes (``/ .. /``) -- this is the place.
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A test case consists of two files:
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* ``test/markup/<language>/<test_name>.txt``: test code
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* ``test/markup/<language>/<test_name>.expect.txt``: reference rendering
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To generate reference rendering use the Developer tool located at
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``tools/developer.html``. Make sure to explicitly select your language in the
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drop-down menu, as automatic detection is unlikely to work in this case.
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