failed to make test using uiautomator 2.0

Question

I want to make uiautomator 2.0 test from the command line. My steps are below:

1. create an Instrumentation project, the code is below:

   package com.android.uiautomator.client;
   
   
   import org.junit.Before;
   import org.junit.Test;
   import org.junit.runner.RunWith;
   import android.app.Application;
   import android.app.Instrumentation;
   import android.content.Context;
   import android.support.test.InstrumentationRegistry;
   import android.support.test.runner.AndroidJUnit4;
   import android.test.ApplicationTestCase;
   
   @RunWith(AndroidJUnit4.class)
   public class Initialize {
   
   @Test
   public void testStartServer() {
       System.out.println("this is the test");
   }
   }
   

2. use gradlew to generate the test apk

3. install the test apk into the android emulator

   adb shell push ${apkPath}/test.apk /data/local/tmp/com.android.test
   
   adb shell pm install -r /data/local/tmp/com.android.test
   

4. check if the test apk is installed successfully. And I can find the installed apk.

   adb shell pm list packages
   

5. after install, I check the Instrumentation in the emulator, but I cant't find the Instrumentation about the test apk. This will lead to failed on executing the command:

   adb shell am instrument -e class com.android.uiautomator.client.Initialize -w com.android.uiautomator.client.test/android.support.test.runner.AndroidJUnitRunner
   

so, I am confused. Why can't I find the instrumentation after I have installed the test apk?

Answer 1

You should run

$ adb shell pm list instrumentation | grep 'target=applicationId'

replacing applicationId by your applicationId to check the available instrumentations for an app.