Test run failed: Instrumentation run failed due to 'java.lang.ClassNotFoundException'

Question

This is my first time setting up an Android test project to test a Android project.

I've created a very basic test case which I'm trying to get to run, however what I have does not run. I get a Test run failed: Instrumentation run failed due to 'java.lang.ClassNotFoundException'.

I would troubleshot this more, however I don't get any more information, such as which class it is trying to find, etc. Any ideas on how to get more information from the error? Any common areas I should look at, or anything that might need to be configured that I'm overlooking?

Below is the information from the console:

[2013-04-16 13:21:49 - XyzProgramTest] Android Launch!
[2013-04-16 13:21:49 - XyzProgramTest] adb is running normally.
[2013-04-16 13:21:49 - XyzProgramTest] Performing android.test.InstrumentationTestRunner JUnit launch
[2013-04-16 13:21:49 - XyzProgramTest] Automatic Target Mode: launching new emulator with compatible AVD 'GalaxyNexusAPI_17'
[2013-04-16 13:21:49 - XyzProgramTest] Launching a new emulator with Virtual Device 'GalaxyNexusAPI_17'
[2013-04-16 13:21:53 - Emulator] extension WGL_ARB_make_current_read was not found
[2013-04-16 13:21:53 - Emulator] extension WGL_EXT_swap_control was not found
[2013-04-16 13:21:53 - Emulator] Failed to create pbuf surface for FB 0x3004
[2013-04-16 13:21:53 - Emulator] emulator: WARNING: Could not initialize OpenglES emulation, using software renderer.
[2013-04-16 13:21:54 - XyzProgramTest] New emulator found: emulator-5554
[2013-04-16 13:21:54 - XyzProgramTest] Waiting for HOME ('android.process.acore') to be launched...
[2013-04-16 13:22:55 - XyzProgramTest] HOME is up on device 'emulator-5554'
[2013-04-16 13:22:55 - XyzProgramTest] Uploading XyzProgramTest.apk onto device 'emulator-5554'
[2013-04-16 13:22:55 - XyzProgramTest] Installing XyzProgramTest.apk...
[2013-04-16 13:23:57 - XyzProgramTest] Success!
[2013-04-16 13:23:57 - XyzProgramTest] Project dependency found, installing: XyzProgram
[2013-04-16 13:23:57 - XyzProgram] Uploading XyzProgram.apk onto device 'emulator-5554'
[2013-04-16 13:23:58 - XyzProgram] Installing XyzProgram.apk...
[2013-04-16 13:24:05 - XyzProgram] Success!
[2013-04-16 13:24:05 - XyzProgramTest] Launching instrumentation android.test.InstrumentationTestRunner on emulator-5554
[2013-04-16 13:24:07 - XyzProgramTest] Test run failed: Instrumentation run failed due to 'java.lang.ClassNotFoundException'

Additional Notes

In my Android test project, I created a simple test with a package similar to the package that matches up with the class I'm trying to test in my Android project. So something like com.company.android.projectname. I've specified this in the Android test project manifest file's instrumentation section.

<instrumentation
    android:name="android.test.InstrumentationTestRunner"
    android:targetPackage="com.company.android.projectname" />

When I changed this to match that, I get a new error that says Test run failed: Unable to find instrumentation target package: com.company.android.projectname

I'm not 100% sure what that targetPackage should be and if I need multiple instrumentations for each package I want to test, etc. When I set it to com.company.android that is when I get the java.lang.ClassNotFoundException.

Answer 1

I had upgraded to androidx libraries and started getting this error.

To fix it, in build.gradle I changed the line:

testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'

to

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"