'Running JUnit5 Test in Parallel But Want To Leave Some Tests Sequential

I have a project that we have many Junit tests. We just did a large migration from JUnit4 to JUnit5. We would like to run most of the tests in parallel but have a couple that need to be ran sequentially. Is there any way to use JUnit5 and run tests both ways?

The reason I ask is that I have 4 tests that load a database into memory and I am loading data into this database. Then I run tests on that database. These are the four tests I need to run sequentially and cannot run in parallel.

javajunit5


Solution 1:[1]

You might take a look at @Isolated annotation https://junit.org/junit5/docs/5.7.1/api/org.junit.jupiter.api/org/junit/jupiter/api/parallel/Isolated.html.

It guarantees that test-class won't run in parallel with other classes.

Solution 2:[2]

According to Parallel Test Execution and Single Thread Execution:

Since of maven-surefire-plugin:2.18, you can apply the JCIP annotation @net.jcip.annotations.NotThreadSafe on the Java class of JUnit test (pure test class, Suite, Parameterized, etc.) in order to execute it in single Thread instance. The Thread has name maven-surefire-plugin@NotThreadSafe and it is executed at the end of the test run.

So you could annotate your test classes with @NotThreadSafe in order to get them executed on 1 same thread (named maven-surefire-plugin@NotThreadSafe).

  <dependency>
    <groupId>com.github.stephenc.jcip</groupId>
    <artifactId>jcip-annotations</artifactId>
    <version>1.0-1</version>
    <scope>test</scope>
  </dependency>

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Solution Source
Solution 1
Solution 2 Adrian

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