Maven does not find JUnit tests to run

By default Maven uses the following naming conventions when looking for tests to run:

• Test*
• *Test
• *Tests (has been added in Maven Surefire Plugin 2.20)
• *TestCase

If your test class doesn't follow these conventions you should rename it or configure Maven Surefire Plugin to use another pattern for test classes.

I also found that the unit test code should put under the src/test/java folder, it can not be recognized as test class if you put it under the main folder.eg.

Wrong

/my_program/src/main/java/NotTest.java

Right

/my_program/src/test/java/MyTest.java

UPDATE:

Like @scottyseus said in the comments, starting from Maven Surefire 2.22.0 the following is sufficient:

<plugin>    <groupId>org.apache.maven.plugins</groupId>    <artifactId>maven-surefire-plugin</artifactId>    <version>2.22.1</version></plugin>

When using JUnit 5, i ran into the same problem. Maven Surefire needs a plugin to run JUnit 5 tests. Add this to our pom.xml:

<plugin>    <groupId>org.apache.maven.plugins</groupId>    <artifactId>maven-surefire-plugin</artifactId>    <version>2.21.0</version>    <dependencies>        <dependency>            <groupId>org.junit.platform</groupId>            <artifactId>junit-platform-surefire-provider</artifactId>            <version>1.2.0-M1</version>        </dependency>        <dependency>            <groupId>org.junit.jupiter</groupId>            <artifactId>junit-jupiter-engine</artifactId>            <version>5.2.0-M1</version>        </dependency>    </dependencies></plugin>

Source:https://junit.org/junit5/docs/current/user-guide/#running-tests-build-maven

UPDATE 2021

The junit-platform-surefire-provider, which was originally developed by the JUnit team, was deprecated in JUnit Platform 1.3 and discontinued in 1.4. Please use Maven Surefire’s native support instead.