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Using MockK on Android UI tests: Troubleshooting Random Failures
When it comes to running Android UI tests using MockK on emulators or physical devices with Android 9+, you would expect consistent results. However, there have been reports of random test failures when using MockK functions, especially on simulators. The failure message often states “Test run failed: Instruments run failed due to ‘Process Crashed’.” This crash can occur either before the first test starts or in the middle of a test sequence, seemingly without a clear pattern. In some rare cases, all tests pass without any crashes, but the randomness prevails.
When analyzing the logs, it appears that the crash is related to the InputDispatcher. The specific error message reads: “InputDispatcher: Channel ‘9fa7335 my.company.com.android.debug/my.company.com.ui.login.LoginActivity(server)’ ~ Channel is irreparably damaged and will be discarded!” Upon searching for this message on Stack Overflow, it seems to be connected to threading issues when manipulating activities that are not the current “activity.”
While it is unfortunate that we cannot provide code to reproduce the problem, it is essential to gather as much relevant information about your setup as possible. This is particularly crucial if the problem only occurs under specific conditions. Here are some details that might help in troubleshooting:
- MockK version: 1.10.0
- Operating system: Windows 10
- Kotlin version: 1.3.72
- JDK version: 1.8.0_242
- JUnit version: 4.12
- Test Type: Android Instrumentation Test
By providing these details, you enable the community to assist you better in identifying the root cause of the random test failures with MockK. As the issue seems to be related to threading and manipulating activities, it might be worth investigating how your MVP architecture utilizes the MockK function. Specifically, check if there are any instances where methods are being used incorrectly or in a way that could lead to threading conflicts.
Additionally, it’s worth mentioning that these tests also include Espresso View assertions to validate the displayed UI. While it is not directly related to the MockK issue, it’s essential to ensure that the UI assertions are implemented correctly and do not contribute to any conflicts or crashes.
In conclusion, using MockK on Android UI tests can occasionally lead to random failures, especially in simulators. The crash, as indicated by the “Process Crashed” message, seems to be related to threading issues when manipulating activities that are not the current “activity.” Although we are unable to provide code to reproduce the problem, by sharing relevant information about your setup, such as the MockK version, operating system, Kotlin version, JDK version, JUnit version, and test type, the community can better assist you in troubleshooting the issue. Please also review your MVP architecture and ensure that the MockK function is used correctly. Lastly, double-check your Espresso View assertions to eliminate any potential conflicts.
Q: Are there any known workarounds for the random test failures with MockK on Android UI tests?
A: As the issue seems to be related to threading, one possible workaround is to carefully review the threading mechanisms in your code and ensure they are properly synchronized.
Q: Is there a specific version of Android where the random test failures occur more frequently?
A: The random test failures with MockK can occur on any emulator or physical device running Android 9+.
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