It's less about testing your code with your documentation, but more the other way around. Make sure that the examples in your documentation stay current with your code.
If you've spent any time working in Python, then you are probably familiar with doctest. The examples you add to document your project are like a map to the secret treasure that your users will find when they are able to easily use your library/API/tool/etc. But if the examples are wrong, it's like labeling the map with "promised land" right over the spot where it should say, "there be dragons".
coffeedoctest is a way to test your documentation with your code... to make sure the map matches the terrain.
I'm building upon Omar Khan's awesome coffedoc tool and using the same conventions. The text within multiline comments is interpreted as markdown markup. Any code blocks (each line that starts with 4 or more spaces) within this markdown is pulled out as "test" code. Any single line comments within these code blocks are treated as your expected output. When this example code runs, it should generate the results shown in the single line comments.
Let's say you have this awesome little library
### Super square Usage: square = require('square').square console.log(square(5)) # 36 Not only will it square 5 but it will square other numbers. console.log(square(4)) # 16 ### exports.square = (n) -> n * n
and you run coffeedoctest
you should see the following output
*** ERRORS FOUND IN YOUR DOCUMENTATION *** Actual does not match expected when running coffeedoctest_temp/square_coffeedoctest.coffee Expected: 36 Actual : 25 Near... square = require('square').square console.log(square(5)) # 36
Notice how you are able to sprinkle non-test narrative in your markdown and it is ignored. Markdown code blocks in all of the properly-positioned multi-line comments found in the module (file) are concatenated into one test as if there was no intervening narrative or production code. Following coffeedoc convention, the proper place for these is either at the top of the module or between the declaration and body of a class, function, etc. Each module (file) is tested independently.
Note that coffeedoctest will not attempt to test codeblocks that are found within ordered or unordered lists. If you want to put some examples in that you don't want tested, you can use this behavior.
If you type
coffeedoctest with no options or
coffeedoctest -h, you'll get the help.
Usage: coffeedoctest [options] [targets] or: coffeedoctest . (scans all .coffee files from the current directory and down) Options: --commonjs : Use if target scripts use CommonJS for module loading (default) --requirejs : Use if target scripts use RequireJS for module loading --readme : Use if you want it to run tests in your README.md file --clean : Deletes temporary files even if there is an error --requirepath : Specifies "require" search root (default "./")
coffeedoctest will create a modified version of your package.json file in the coffeedoctest temporary
working directory. This makes it possible for your example code to do simple
requires so you don't
clutter your example code with relative paths that may not apply to your users' usage.
A typical usage might look like this:
coffeedoctest --readme src
npm install coffeedoctest --save-dev