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Code Coverage with Istanbul

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What is Code Coverage?

1:53 with Andrew Chalkley

In this video we'll look what code coverage is, why you should use it and what it _doesn't_ do.

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    [MUSIC] 0:00
    Hello world. 0:04
    Andrew here, JavaScript developer, lifelong learner and 0:05
    teacher here at Treehouse. 0:08
    In this workshop, we're going to be talking about code coverage. 0:10
    Code coverage is the healthy development practice that describes how 0:14
    much of a program source code is executed during the execution of the test sweep. 0:18
    So, why should you do code coverage? 0:23
    Well, it helps to see how much testing you're doing in your project. 0:26
    It helps you spot parts in your code that the tests are missing. 0:29
    It's also good to show business stakeholders in a project, 0:33
    whether they are a project manager or clients on a project. 0:36
    If you're publishing NPM modules, 0:40
    showing your code coverage gives developers confidence in your module. 0:43
    For example, you'd expect a module with 100% code coverage 0:47
    should work better than a module with only 10%. 0:51
    While software with more code coverage may instill more confidence than software 0:54
    without code coverage, 0:58
    it doesn't guarantee the quality of the tests that test the source code. 1:00
    For example, there may be sets in edge cases missing. 1:04
    Because test edge cases could be missing, 1:08
    there could be some bugs that could still happen. 1:10
    In other words, having 100% code coverage doesn't ensure good software. 1:14
    The till we'll be using for code coverage is called Istanbul. 1:20
    Istanbul is a node module that's compatible with testing libraries 1:24
    like Mocha and Jasmine. 1:27
    Istanbul can generate code coverage reports that are compatible with 1:29
    online services like Coveralls and Codecov. 1:32
    You can share your open source projects code coverage publicly, or 1:37
    your internal or client projects privately. 1:40
    In this workshop, we're going to set up code coverage in a simple calculator app. 1:44
    Feel free to clone the app now or download the zip file attached to this video. 1:48

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