Code coverage

Code coverage is a subject that has recently come up in my Testing class and it did catch my attention for its useful functionality. So what's code coverage? Code coverage is how much of the code that has been executed during the testing process. This process is not only check for every line of code, it also checks if all the branch of conditional and loops is covered. With this process in place, it would surely decrease the number of bugs.

With that being said, how would developers be able to apply this into their code? There are a lot of system and plugins out there that would help doing this job correctly, I will take JaCoCo plugins for Gradle as an example in this post, since I think it is a really good system that gives excellent reports. To enable JaCoCo, add this line to build.gradle:

 apply plugin: 'jacoco' 

What is greater about JaCoCo is that it let user define thresholds or conditions that the code coverage has to pass in order for the build system to return pass. For example, consider this configuration below:

jacocoTestCoverageVerification {
    violationRules {
        rule {
            limit {
                minimum = 0.8
check.dependsOn jacocoTestCoverageVerification

When this task runs, build system will ensure that the build only pass only if the code coverage metric reaches 80%. As simple as it looks like, I think it is an essential quality of life plugin to have for the build system.

Article can be found here.


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