如何从Google Firebase获取代码覆盖率报告以进行Android Espresso测试 [英] How to get code coverage reports from google Firebase for Android Espresso tests

问题描述

基于此文档- https://developer.android.com/studio/test/command-line.html#AMOptionsSyntax 可以从Firebase实验室获取代码覆盖率结果. firebase-community.slack.com上#test-lab中的一些人可以使其工作，但是经过几次尝试后，我仍然碰壁.

Based on this documentation - https://developer.android.com/studio/test/command-line.html#AMOptionsSyntax it is possible to get code coverage results back from Firebase lab. Some folks in #test-lab at firebase-community.slack.com are able to get it working but after few attempts I am still hitting a wall.

我可以通过

I am able to get a combined code coverage report of jacaco and emma by following this guide so there is nothing wrong with my local setup but problematic when trying to give arguments to gcloud cmd line to ask for coverage numbers and it talks about emma coverage.

基本上，当我在本地运行此命令时

Essentially, when I run this command locally

gcloud beta test android run \
  --type instrumentation \
  --app app/build/outputs/apk/*-debug-unaligned.apk \
  --test app/build/outputs/apk/*-debug-androidTest-unaligned.apk \
  --device-ids Nexus6\
  --os-version-ids 22 \
  --locales en \
  --orientations portrait \
  --environment-variables coverage=true,coverageFile="/sdcard/coverage.ec" \
--directories-to-pull=/sdcard

我希望会生成覆盖率报告，但是我可以在instrument.results文件中找到它

I am expecting the coverage report to be generated but I get this in the instruments.results file

INSTRUMENTATION_STATUS: numtests=1
INSTRUMENTATION_STATUS: stream=
com.godaddy.gdm.telephony.uitests.DialerTabTest:
INSTRUMENTATION_STATUS: id=AndroidJUnitRunner
INSTRUMENTATION_STATUS: test=dialerTabNumberFormattingTest
INSTRUMENTATION_STATUS: current=1
INSTRUMENTATION_STATUS_CODE: 1
INSTRUMENTATION_STATUS: numtests=1
INSTRUMENTATION_STATUS: stream=.
INSTRUMENTATION_STATUS: id=AndroidJUnitRunner
INSTRUMENTATION_STATUS: test=dialerTabNumberFormattingTest
INSTRUMENTATION_STATUS: current=1
INSTRUMENTATION_STATUS_CODE: 0
INSTRUMENTATION_RESULT: stream=

Time: 6.022

OK (1 test)


Error: **Failed to generate emma coverage.**
INSTRUMENTATION_CODE: -1

logcat这样说:

And logcat says this:

11-18 21:38:39.400: I/TestRunner(5246): run finished: 1 tests, 0 failed, 0 ignored
11-18 21:38:39.400: I/TestRunner(5246): [ 11-18 21:38:39.400  5246: 5263 E/         ]
11-18 21:38:39.400: I/TestRunner(5246): Failed to generate emma coverage.
11-18 21:38:39.400: I/TestRunner(5246): java.lang.reflect.InvocationTargetException
11-18 21:38:39.400: I/TestRunner(5246):   at java.lang.reflect.Method.invoke(Native Method)
11-18 21:38:39.400: I/TestRunner(5246):   at java.lang.reflect.Method.invoke(Method.java:372)
11-18 21:38:39.400: I/TestRunner(5246):   at android.support.test.internal.runner.listener.CoverageListener.generateCoverageReport(CoverageListener.java:80)
11-18 21:38:39.400: I/TestRunner(5246):   at android.support.test.internal.runner.listener.CoverageListener.instrumentationRunFinished(CoverageListener.java:68)
11-18 21:38:39.400: I/TestRunner(5246):   at android.support.test.internal.runner.TestExecutor.reportRunEnded(TestExecutor.java:94)
11-18 21:38:39.400: I/TestRunner(5246):   at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:69)
11-18 21:38:39.400: I/TestRunner(5246):   at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
11-18 21:38:39.400: I/TestRunner(5246):   at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1853)
11-18 21:38:39.400: I/TestRunner(5246): Caused by: java.io.FileNotFoundException: /sdcard/coverage.ec: open failed: EACCES (Permission denied)
11-18 21:38:39.400: I/TestRunner(5246):   at libcore.io.IoBridge.open(IoBridge.java:456)
11-18 21:38:39.400: I/TestRunner(5246):   at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
11-18 21:38:39.400: I/TestRunner(5246):   at com.vladium.emma.rt.RT.dumpCoverageData(RT.java:50)
11-18 21:38:39.400: I/TestRunner(5246):   ... 8 more
11-18 21:38:39.400: I/TestRunner(5246): Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
11-18 21:38:39.400: I/TestRunner(5246):   at libcore.io.Posix.open(Native Method)
11-18 21:38:39.400: I/TestRunner(5246):   at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
11-18 21:38:39.400: I/TestRunner(5246):   at libcore.io.IoBridge.open(IoBridge.java:442)
11-18 21:38:39.400: I/TestRunner(5246):   ... 10 more

如有需要，我可以提供更多信息.

I can give more information if needed.

推荐答案

事实证明，所需要做的就是为SD卡上的写入启用适当的权限.

It turned out all that needed was to enable the proper permission for Writing on SD card.

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

在AndroidManifest.xml中，例如在 SO答案

in AndroidManifest.xml like in this SO answer

还要确保在app/build.gradle中启用了testCoverageEnabled true进行调试

Also, make sure testCoverageEnabled true is enabled in app/build.gradle for debug

debug {
            testCoverageEnabled true
}

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