Java Error: JUnit5 Error, How to Fix and Avoid

JUnit is a unit testing framework for the Java programming language. It helps developers test the quality and functionality of their code and validate it during the development process. However, sometimes when using JUnit5, you will encounter some errors, which may waste your time and stall your development work. This article will explore how to solve and avoid JUnit5 errors.

Error 1: JUnit5 not found
When using JUnit5, you need to ensure that JUnit5 is available. If you see an error message like "Unable to resolve symbol junit:junit:5." or "JUnit5 not found", then you need to check that your build tool has the JUnit5 dependency configured correctly. In Maven projects, it is recommended to place this dependency in the dependencies section of the pom.xml file.

Error 2: Test method not executed
When running the test, if you find that your test method is not executed, then you may want to look at the test code. A common cause of this error is incorrectly named test methods. You need to make sure that your JUnit5 test method name starts with test and does not take parameters. An example of a correct JUnit5 test method:

@Test
public void testAddition() {
    //code here
}

In this example, the test method name starts with "test" and does not have any parameters, so JUnit5 can recognize it correctly.

Error 3: Assertion failed
JUnit5’s assertions are a powerful feature that can help you verify the correctness of your code. However, when your assertion fails, you need to check that the condition in your code is what you expected.

For example, if you want to test an addition method, but when you test it you find that the result is wrong, then you need to check whether the implementation of your addition method is correct. This is a wrong implementation:

public int addition(int a, int b) {
    return a-b;
}

This method implementation is wrong, it should be like this:

public int addition(int a, int b) {
    return a+b;
}

After using JUnit5's assertion test, you can be sure that your addition method is correct.

Mistake 4: Forgetting to start a JUnit test
Finally, if you forget to run a JUnit test, you will not get any test results. Make sure the test class contains the @RunWith and @Test annotations, and select the " Run > JUnit " or mvn test command to run.

Summary
If you find that you are having issues using JUnit5, be sure to check that your build tools are configured correctly for JUnit5. Also, review error messages and logs carefully. If you encounter JUnit5 errors, often, these errors can be resolved or avoided.

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