AndroidCodeCoverage.pdf

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ANDROID CODE COVERAGE Michal Jeníček, Android Engineer at STRV

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!2 “Code coverage is not your enemy. It’s a tool to help you with development.“

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JACOCO JAVA CODE COVERAGE !3 ● Based on byte code, thus is for Kotlin too

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MISSED INSTRUCTIONS & BRANCHES !4 ● JaCoCo offers two main metrics

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CODE COVERAGE SAMPLE !5

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CODE COVERAGE - DOES IT WORTH? !12 Code coverage analysis will ● Help to find missing branches in unit testing ● Help to keep in mind when there will be decreasing coverage with new code Code coverage analysis will NOT ● Ensure, you have been writing tests right

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CODE COVERAGE - WHEN TO USE !13 Whenever tests are written ● It’s small effort to get helpful tool useful for checking our tests Whenever tests are executed on CI ● It’s small effort to connect code coverage to continuous integration

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RUN CODE COVERAGE !14

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Intellij IDEA !15 ● Analyse simple project locally (no standard outputs)

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GRADLE PLUGIN DEFAULT TASK !16 ● Analyse simple project for CI (instrumentation only)

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GRADLE PLUGIN CUSTOM TASK !17 ● Analyse complex project for CI

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UNIT TEST ANALYSIS !18

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CI GIT INTEGRATION !25

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CI BRANCH CHECKS !26 ● Run checks with every push to branch automatically ● Merge pull request / branch based on available checks

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CIRCLE CI 2.0 !27

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CIRCLE CI 2.0 !28

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CIRCLE CI 2.0 !29

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CIRCLE CI 2.0 !30

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TRAVIS CI !31

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TRAVIS CI !32

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TRAVIS CI !33

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TRAVIS CI !34

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JENKINS PIPELINE !35

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JENKINS PIPELINE !36

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JENKINS PIPELINE !37

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!38 JENKINS UI

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CODE COVERAGE OUTPUTS !39

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OUTPUTS STRUCTURE !40

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OUTPUTS STRUCTURE !41

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OUTPUTS STRUCTURE !42

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OUTPUTS STRUCTURE !43

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JACOCO LOCAL !44

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JACOCO LOCAL !45

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CODECOV !46

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SAMPLE PROJECT !47

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I have prepared stub of sample application to apply all kinds of code coverage ability. Sample application is built following way: ● Single activity multi-module application ● Navigation architecture component ● MVVM approach ● DI with Dagger ● Connected to Travis, Circle CI, Jenkins CI & Codecov !48 HTTPS://GITHUB.COM/KOTOMISAK/IMAGE-ANALYZER-ANDROID