Selecting tests by tags and classes in JUnit - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of using tags in JUnit tests?

Tags help group tests so you can run specific sets of tests based on their category or purpose, like 'fast' or 'database'.

beginner

How do you tag a test method in JUnit 5?

Use the @Tag annotation above the test method, for example: <br> @Tag("fast")<br>void testQuick() { ... }

intermediate

What is the difference between selecting tests by tags and by classes in JUnit?

Selecting by tags runs tests marked with specific tags anywhere in your code. Selecting by classes runs all tests inside specific test classes.

intermediate

How can you run tests from a specific class using the JUnit Console Launcher?

Use the option --select-class=your.package.YourTestClass to run all tests in that class.

advanced

Why is it useful to combine tags and classes when selecting tests?

Combining tags and classes lets you run very specific tests, like only 'slow' tests in a certain class, saving time and focusing on relevant tests.

Which annotation is used to tag tests in JUnit 5?

A @TestCategory

B @Category

C @Tag

D @TestTag

JUnit 5 uses @Tag to mark tests with tags for selection.

How do you run tests with the tag 'integration' using the JUnit Console Launcher?

A --include-tag integration

B --select-tag integration

C --tags integration

D --filter-tag integration

The correct option is --include-tag to select tests by tag.

What happens if you select tests by class name in JUnit?

A Runs tests only if they have no tags

B Runs only tagged tests in that class

C Runs tests in all classes with similar names

D Runs all tests inside that class

Selecting by class runs all tests inside the specified class.

Can you combine multiple tags when selecting tests in JUnit?

A Yes, you can include multiple tags

B No, only one tag at a time

C Only if tags are numeric

D Only if tags are in the same package

JUnit allows including multiple tags to run tests matching any of them.

Which command runs all tests in the class 'com.example.MyTests'?

A --run-class com.example.MyTests

B --select-class com.example.MyTests

C --include-class com.example.MyTests

D --class-name com.example.MyTests

The correct syntax is --select-class followed by the full class name.

Explain how you would use tags and classes to run only a subset of tests in a large JUnit project.

Think about grouping tests by purpose and location.

Describe the benefits of selecting tests by tags compared to selecting by classes.

Consider how tests are organized and run.