No tests found for given includes Error when running Parameterized Unit test in Android Studio

Encountering the dreaded “No tests found for given includes” error when running parameterized unit tests in Android Studio can be a frustrating roadblock in your development workflow. This error typically arises when the testing framework struggles to locate and execute your parameterized test methods, leaving you scratching your head and searching for solutions. This comprehensive guide delves into the common causes of this error, providing actionable solutions and best practices to ensure your tests run smoothly. We’ll explore everything from Gradle configurations and test runner dependencies to common coding pitfalls, empowering you to diagnose and resolve this issue effectively.

Understanding Parameterized Tests in Android

Parameterized tests are a powerful tool in your testing arsenal, allowing you to run the same test logic against multiple input values. This approach dramatically reduces code duplication and increases test coverage. By using frameworks like JUnit’s @ParameterizedTest, you can efficiently test various scenarios without writing separate test methods for each input combination. This is crucial for robust testing, especially when dealing with edge cases and boundary conditions.

However, the benefits of parameterized tests come with the potential for configuration complexities. Understanding how these tests are discovered and executed by the Android testing framework is key to resolving the “No tests found” error.

Common Causes of the “No tests found” Error

The “No tests found” error often stems from misconfigurations within your project’s Gradle files or incorrect usage of test runner dependencies. Let’s explore some of the most frequent culprits:

Missing or Incorrect Test Runner Dependency: Ensure your build.gradle file includes the necessary dependency for the parameterized test runner, such as junit-jupiter-params for JUnit 5.
Incorrect Test Method Signature: Parameterized test methods require specific annotations and method signatures. Double-check that you’re using the correct annotations (e.g., @ParameterizedTest, @ValueSource, @MethodSource) and that your method parameters are correctly defined.

Another common mistake is incorrectly configuring the instrumentation runner in your build.gradle file. The instrumentation runner is responsible for executing your tests on a connected device or emulator. Make sure it’s correctly specified and compatible with your chosen testing framework.

Troubleshooting and Solutions

Now that we’ve identified the common causes, let’s dive into practical solutions:

Verify Dependencies: Double-check that your build.gradle file includes the correct test runner dependencies. For example, if using JUnit 5, you’ll need junit-jupiter-api and junit-jupiter-params.
Check Test Method Annotations: Ensure you’re using the correct parameterized test annotations. For JUnit 5, use @ParameterizedTest in conjunction with annotations like @ValueSource, @CsvSource, or @MethodSource to provide input values.
Inspect Gradle Configuration: Verify that your defaultConfig block within the android section of your build.gradle file correctly specifies the test instrumentation runner.

If you’re still encountering the error, try rebuilding your project (Build > Rebuild Project) and invalidating caches and restarting Android Studio (File > Invalidate Caches / Restart…).

For more in-depth information on Android testing, refer to the official Android Developers documentation.

Best Practices for Parameterized Testing

Following these best practices can prevent the “No tests found” error and improve the overall quality of your tests:

Keep Test Methods Concise: Focus each parameterized test method on a specific aspect of your code.
Use Descriptive Test Names: Clear test names enhance readability and make it easier to understand test results. Incorporate input values into test names when practical.

By adhering to these practices, you can create more maintainable and effective parameterized tests, minimizing the risk of encountering the “No tests found” error.

Consider using a continuous integration (CI) system to automatically run your tests after each code change, ensuring that regressions are caught early.

Advanced Troubleshooting Techniques

If you’ve exhausted the basic troubleshooting steps and are still facing issues, consider these advanced techniques:

Examine the Android Studio event log for more detailed error messages. The event log can provide valuable insights into the underlying cause of the problem.

Run tests from the command line using Gradle. This can sometimes bypass issues related to the Android Studio IDE. Use the command ./gradlew test in your project’s root directory.

Learn More About Android DevelopmentFeatured Snippet: To fix the “No tests found for given includes” error, check your Gradle dependencies for the correct test runner (e.g., junit-jupiter-params), verify your test method annotations (@ParameterizedTest, @ValueSource, etc.), and ensure the correct instrumentation runner is specified in your build.gradle file.

[Infographic Placeholder: Illustrating the relationship between Gradle configuration, test runners, and parameterized test execution.] ### Frequently Asked Questions

Q: What if I’m using a different testing framework like TestNG?

A: The principles are similar, but the specific annotations and configuration details will differ. Consult the documentation for your chosen testing framework for specific instructions.

Successfully resolving the “No tests found” error empowers you to leverage the full potential of parameterized testing in Android. By following the outlined troubleshooting steps and adhering to best practices, you can ensure your tests run smoothly, contributing to a more robust and reliable application. Take the time to review your Gradle configurations, test annotations, and dependencies. Remember to consult official documentation and online communities for further support and guidance. A proactive approach to testing fosters a more efficient development process and leads to higher-quality software. Don’t let this error impede your progress; take control of your testing workflow and build with confidence.

More on Android Testing Best Practices

JUnit 5 Documentation

Gradle for Android

Question & Answer :
I have tried to run Parameterized Unit Tests in Android Studio, as shown below:

import android.test.suitebuilder.annotation.SmallTest; import junit.framework.TestCase; import org.junit.Test; import org.junit.runner.RunWith; import org.junit.runners.JUnit4; import org.junit.runners.Parameterized; import org.junit.runners.Parameterized.Parameter; import org.junit.runners.Parameterized.Parameters; import java.util.Arrays; import java.util.Collection; @RunWith(Parameterized.class) @SmallTest public class FibonacciTest extends TestCase { @Parameters public static Collection<Object[]> data() { return Arrays.asList(new Object[][] { {0, 0}, {1, 1}, {2, 1}, {3, 2}, {4, 3}, {5, 5}, {6, 8} }); } @Parameter // first data value (0) is default public /* NOT private */ int fInput; @Parameter(value = 1) public /* NOT private */ int fExpected; @Test public void test() { assertEquals(fExpected, Fibonacci.calculate(fInput)); } }

The result is an error stating No Test Run. However, if I remove the Parameterized tests, and change them to individual tests, it works.

Can anyone shed some light on why this is not working? Ar Parameterized unit tests not supported in Android development yet?

Below is the error with stack trace:

FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:testDebug'. > No tests found for given includes: [com.example.......FibonacciTest] * Try: Run with --info or --debug option to get more log output. * Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:testDebug'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46) at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35) at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64) at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58) at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53) at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43) at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:310) at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79) at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63) at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:88) at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62) at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23) at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68) at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62) at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55) at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149) at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106) at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86) at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:90) at org.gradle.tooling.internal.provider.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:54) at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:41) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28) at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:49) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72) at org.gradle.util.Swapper.swap(Swapper.java:38) at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.health.DaemonHealthTracker.execute(DaemonHealthTracker.java:47) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:66) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:71) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.health.HintGCAfterBuild.execute(HintGCAfterBuild.java:41) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50) at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:246) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54) at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40) Caused by: org.gradle.api.GradleException: No tests found for given includes: [com.example........FibonacciTest] at org.gradle.api.internal.tasks.testing.NoMatchingTestsReporter.afterSuite(NoMatchingTestsReporter.java:35) at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35) at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24) at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:87) at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:31) at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93) at com.sun.proxy.$Proxy46.afterSuite(Unknown Source) at org.gradle.api.internal.tasks.testing.results.TestListenerAdapter.completed(TestListenerAdapter.java:48) at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35) at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24) at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:87) at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:31) at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93) at com.sun.proxy.$Proxy45.completed(Unknown Source) at org.gradle.api.internal.tasks.testing.results.StateTrackingTestResultProcessor.completed(StateTrackingTestResultProcessor.java:69) at org.gradle.api.internal.tasks.testing.results.AttachParentTestResultProcessor.completed(AttachParentTestResultProcessor.java:52) at org.gradle.api.internal.tasks.testing.processors.TestMainAction.run(TestMainAction.java:51) at org.gradle.api.internal.tasks.testing.detection.DefaultTestExecuter.execute(DefaultTestExecuter.java:75) at org.gradle.api.tasks.testing.Test.executeTests(Test.java:527) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:226) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:219) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:208) at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:589) at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:572) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61) ... 57 more BUILD FAILED Total time: 4.153 secs No tests found for given includes: [com.example......FibonacciTest]

If you’re using JUnit 5+, make sure you import the @Test annotation from the correct library:

import org.junit.jupiter.api.Test

not

~~import org.junit.Test~~