Code coverage in WebStorm allows you to perform on-the-fly line coverage measuring for your code with low runtime overhead. In general, line coverage answers the question, "Was this line of code executed during unit testing simulation?"
Measuring code coverage is available for JSTestDriver unit tests.
- For a directory: the percentage of the covered classes and lines.
- For a file: the percentage of the covered lines.
When a file is opened in the editor, each line is highlighted with regard to its code coverage status:
- Lines executed during simulation are marked green.
- Lines not executed during simulation are marked red.
The coverage measurement results comprise a coverage suite. You can have the results of a new simulation merged with any existing suite. In this case, a line will be considered covered if it is covered by at least one of the simulations.