Android Test Runner: Empty Test Suite Error - Troubleshooting Guide

├Źndice
  1. What is Android Test Runner?
  2. What is Empty Test Suite Error?
  3. Troubleshooting Guide
    1. 1. Check the Test Configuration
    2. 2. Check the Test Methods
    3. 3. Clean and Rebuild the Project
    4. 4. Run the Tests from Command Line
  4. Conclusion

What is Android Test Runner?

Android Test Runner is a tool provided by Android Studio for running tests on Android applications. It is used to test the functionality and performance of an app in a simulated environment.

What is Empty Test Suite Error?

Empty Test Suite Error is an error that occurs when Android Test Runner is unable to find any tests to run in the test suite. This error can be caused by various reasons, including incorrect configuration or missing test methods.

Troubleshooting Guide

If you are facing the Empty Test Suite Error in Android Test Runner, you can follow the below troubleshooting guide to resolve the issue:

1. Check the Test Configuration

Make sure that the test configuration is set up correctly in the build.gradle file. Check the testInstrumentationRunner property to ensure that it points to the correct test runner. Also, verify that the test source sets are correctly defined.


android {
    defaultConfig {
        ...
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    sourceSets {
        androidTest {
            java.srcDirs = ['src/androidTest/java']
        }
    }
}

2. Check the Test Methods

Ensure that the test methods are defined correctly and are not missing any annotations. The @Test annotation is required for every test method, and the @RunWith and @SmallTest annotations are optional.


import org.junit.Test;
import org.junit.runner.RunWith;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.filters.SmallTest;

@RunWith(AndroidJUnit4.class)
@SmallTest
public class ExampleUnitTest {
    
    @Test
    public void addition_isCorrect() {
        assertEquals(4, 2 + 2);
    }
}

3. Clean and Rebuild the Project

Some times, the Empty Test Suite Error can be caused by a build issue. Try cleaning and rebuilding the project to see if the error goes away.

4. Run the Tests from Command Line

If you are still facing the issue, try running the tests from the command line using the adb command. This will help you identify any issues with the Android Test Runner.


$ adb shell am instrument -w com.example.app.test/android.support.test.runner.AndroidJUnitRunner

Conclusion

Empty Test Suite Error in Android Test Runner is a common issue that can be resolved by following the above troubleshooting guide. By ensuring that the test configuration and methods are set up correctly, cleaning and rebuilding the project, and running the tests from the command line, you can get your tests up and running in no time.

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