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Chris Veness' discussion of using the spherical law of cosines (http://www.movable-type.co.uk/scripts/latlong.html) suggests it gives well-conditioned results "around 1 metre" in JavaScript (this assumes a sphere with 6,371km radius). In Chrome 33, Math.pow(Math.cos(Math.PI / 4), 2) yields 0.4999999999999999. When we take the arccosine of twice this, we get something significantly different than zero. Multiplying by 6371 means we can't assert that this is within 1e-9 of zero.
Included in this directory
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ol.html - the web page used to run the test suite.
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spec - includes the OpenLayers test/spec files.
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expect-0.2.0 - Minimalistic BDD-style assertion framework. https://github.com/LearnBoost/expect.js/
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jquery-1.9.1 - The Write Less, Do More, JavaScript Library. http://jquery.com/
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mocha-1.8.1 - the fun, simple, flexible JavaScript test framework. http://visionmedia.github.com/mocha/
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sinon-1.6.0 - Standalone test spies, stubs and mocks for JavaScript. http://sinonjs.org/
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test-extensions.js - includes OpenLayers-specific extensions to the testing frameworks.
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mocha-phantom - a PhantomJS script for headless testing with mocha. http://metaskills.net/mocha-phantomjs/
Run the test suite with PhantomJS
With PhantomJS installed, and assuming phantomjs is in the PATH:
$ phantomjs mocha-phantom.coffee ol.html
(Works with PhantomJS 1.6.1, untested with other versions.)
This command can also be run by doing ./build.py test at the root of ol3.
Make sure that the polvr web server is running (./build.py serve), otherwise
you will most likely see something like 0 specs, 0 failures in 0.001s..
Tip for TDD'ers: to make PhantomJS run the test suite continuously each time
a spec file is changed you can use nosier (http://pypi.python.org/pypi/nosier)
and do nosier -p test -p src "./build.py test".