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57 lines
1.8 KiB
Markdown
57 lines
1.8 KiB
Markdown
# Android code coverage instructions
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These are instructions for collecting code coverage data for android
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instrumentation and junit tests.
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[TOC]
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## How EMMA coverage works
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In order to use EMMA code coverage, we need to create build time **.em** files
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and runtime **.ec** files. Then we need to process them using the
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build/android/generate_emma_html.py script.
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## How to collect EMMA coverage data
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1. Use the following GN build arguments:
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```
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target_os = "android"
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emma_coverage = true
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emma_filter = "org.chromium.chrome.browser.ntp.*,-*Test*,-*Fake*,-*Mock*"
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```
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The filter syntax is as documented for the [EMMA coverage
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filters](http://emma.sourceforge.net/reference/ch02s06s02.html).
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Now when building, **.em** files will be created in the build directory.
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2. Run tests, with option `--coverage-dir <directory>`, to specify where to save
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the .ec file. For example, you can run chrome junit tests:
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`out/Debug/bin/run_chrome_junit_tests --coverage-dir /tmp/coverage`.
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3. Turn off strict mode when running instrumentation tests by adding
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`--strict-mode=off` because the EMMA code causes strict mode violations by
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accessing disk.
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4. Use a pre-L Android OS (running Dalvik) because code coverage is not
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supported in ART.
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5. The coverage results of junit and instrumentation tests will be merged
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automatically if they are in the same directory.
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6. Now we have both .em and .ec files. We can create a html report using
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`generate_emma_html.py`, for example:
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```
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build/android/generate_emma_html.py \
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--coverage-dir /tmp/coverage/ \
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--metadata-dir out/Debug/ \
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--output example.html
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```
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Then an example.html containing coverage info will be created:
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```
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EMMA: writing [html] report to [<your_current_directory>/example.html] ...
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```
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