How to use android.test.servicetestcase correctly?

My application is a service running in / system / APP

com.abc.def.MyApp

Trying to write a unit test for this, I received this error in logcat at runtime

I/TestGrouping( 5647): TestCase class com.abc.def.test.MyAppTest is missing a public constructor with no parameters or a single String parameter - skipping

Commands used:

D:\tmp_install>adb shell am instrument -w com.abc.def.test/android.test.InstrumentationTestRunner
WARNING: linker: memtrack.jacinto6.so: unused DT entry: type 0xf arg 0x115
WARNING: linker: libsrv_um.so: unused DT entry: type 0xf arg 0xc4e
WARNING: linker: gralloc.jacinto6.so: unused DT entry: type 0xf arg 0x5d9
WARNING: linker: libpvr2d.so: unused DT entry: type 0xf arg 0x778

Test results for InstrumentationTestRunner=
Time: 0.0

OK (0 tests)

My code snippet is:

public class MyAppTest extends ServiceTestCase<MyApp> {
public MyAppTest(Class serviceClass) {
      super(serviceClass);
      Log.d(tag, "Hello World! MyAppTest ctor");
}
public MyApptest() {
  super(com.abc.def.MyApp.class);
}

….

I have followed this answer https://stackoverflow.com/a/8981508/398348

Am I using servicetestcase incorrectly?

resolvent:

As far as I know, you are using servicetestcase correctly!

Usually, you only need a constructor without parameters to work properly, and you have provided it

public MyApptest() {
    super(com.abc.def.MyApp.class);
}

Linker warnings you receive are usually connected to NDK. They should still not be a problem for your test

Although it is not a complete solution, I suggest you try to run the same tests using gradle connected Android test. If they run normally, at least we know that the problem is with the AM instrument - it may be that the test project is configured incorrectly

Edit: if you use gradle to build a project (by default if you use Android studio), just enter the main project directory and execute the following command to run all instrumentation tests (such as the servicetestcase example above)

./gradlew connectedAndroidTest