junit: no tests found

Question

I have inherited a Java project and am new to Java development. I feel a good way for me to get comfortable with the code is to write some tests around it. I'm writing my code using IntelliJ.

My existing project has a folder structure like this:

/myProject   /src     /main       /java         /com.lexcorp           /core             /email               /providers                 emailProvider.java 

I created a new project that will hold tests for this project. I would like this project to hold both unit and integration tests. Currently, my new project has a structure like this:

/myProjectTests   /src     /main       /java         /com.lexcorp.core.email.providers           emailProviderTest.java 

The emailProviderTest.java file looks like the following:

package com.lexcorp.core.email.providers;  import junit.framework.TestCase; import org.junit.Test;  public class EmailProviderTest extends TestCase {      private final String username = "[testAccount]";      private final String password = "[testPassword]";      @Test     public void thisAlwaysPasses() {         assertTrue(true);     } } 

This project has a Run/Debug configuration with the following properties:

• Test kind: All in package
• Search for tests: In whole project

When I run this configuration, I get an error that says:

junit.framework.AssertionFailedError: No tests found in com.lexcorp.core.email.providers.EmailProviderTest     at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:84)     at org.junit.runners.Suite.runChild(Suite.java:127)     at org.junit.runners.Suite.runChild(Suite.java:26)     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)     at org.junit.runners.ParentRunner.run(ParentRunner.java:309)     at org.junit.runner.JUnitCore.run(JUnitCore.java:160)     at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)     at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:202)     at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:65)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)     at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) 

I do not understand why I'm getting an error that boils down to: "No tests found". While my project structures differ, the folder structures on the OS match (which is another thing that confuses me). Why am I getting this error and how do I fix it?

Answer 1

I was getting this error, too:

junit.framework.AssertionFailedError: No tests found in ...

The reason was that I forgot to specify

defaultConfig {     ...     testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } 

After syncing the project, it found the tests. So maybe it helps someone else.