Collect code coverage data

[danvk]

blanket.js and coveralls.io are a killer combo. We've done the hard work of writing the unit tests, let's get the payoff!

[danvk]

... or perhaps not so simple. See https://github.com/danielmlipton/travis-ci-js-test-driver

[danvk]

The easiest way to get this might be to port our tests to Mocha or QUnit. We should probably do this anyway, it looks like js-test-driver has stagnated (no releases in >2 years).

[danvk]

I followed the jstd coverage instructions and got some basic numbers. Generally coverage is pretty high! I'll see if I can generate an HTML report.

100.0%: /dygraph-plugin-install.js
100.0%: /dygraph-plugin-base.js
100.0%: /dygraph-dev.js
100.0%: /datahandler/bars.js
 99.0%: /plugins/chart-labels.js
 98.0%: /datahandler/bars-custom.js
 96.9%: /plugins/axes.js
 96.8%: /dygraph-tickers.js
 96.2%: /dygraph-layout.js
 96.0%: /dygraph-canvas.js
 95.7%: /datahandler/bars-error.js
 95.4%: /plugins/grid.js
 95.2%: /dygraph-options.js
 94.0%: /dashed-canvas.js
 93.6%: /datahandler/default.js
 91.3%: /datahandler/bars-fractions.js
 90.6%: /datahandler/default-fractions.js
 89.7%: /dygraph-utils.js
 87.6%: /plugins/annotations.js
 86.8%: /plugins/range-selector.js
 86.4%: /dygraph.js
 82.6%: /dygraph-options-reference.js
 72.4%: /plugins/legend.js
 59.3%: /dygraph-interaction-model.js
 59.1%: /datahandler/datahandler.js
 43.3%: /extras/smooth-plotter.js
 27.2%: /dygraph-gviz.js

[danvk]

And here's a nicer view on coveralls.io.

Overall code coverage is ~87%. Some areas that are really lacking testing include:

• GViz DataTable inputs
• fractions
• A few specific options, e.g. labelsKMG2, legend: follow, panEdgeFraction
• resizing
• touch events

This also brings up a lot of IE checks that we missed!