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    JUnit

    JUnit Unit Testing Framework

    What is JUnit?

    JUnit is a simple, open-source Unit Testing framework tool to write and run repeatable unit tests. Also, it is an instance of the xUnit architecture for unit testing frameworks. It is mostly used as a Unit testing tool by most developers.

    JUnit main features are as below:

    • Annotations to mark the methods as Test methods.
    • Assertions for testing expected results/actual results.

    Test runner for running tests as shown in the below picture.

     

     

    Unit Testing

     

    JUnit 4 Maven dependency

    If your build tool is Maven, then add a dependency to JUnit to pom.xml. Replace the minor version to the latest stable version.

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.xx</version>
      <scope>test</scope>
    </dependency>

     

    JUnit 4 Annotations:

    Annotations mark the tests as test cases ex: with @Test. The most common JUnit 4 annotations are:

    @Test
    @Before
    @After

    A simple JUnit test:

    The @Test annotation tells JUnit that the method to which it is attached can be run as a test case. Also, to run the method, JUnit first constructs a fresh instance of the class then invokes the annotated method. In addition, any exceptions thrown by the test will be reported by JUnit as a failure. If no exceptions are thrown, the test is assumed to have succeeded.

     

    @Test
    public void testMethod()
    {
    assertEquals(1, 1);
    }

     

    https://www.testingdocs.com/anatomy-of-a-junit-test/

    In conclusion, the most recommended tool for writing/executing Java unit tests is JUnit. JUnit 4 is a major API revision release  ( However, a new version JUnit5 is around the corner).

     

    JUnit Tutorial on this website can be found at:

    https://www.testingdocs.com/junit-tutorial/

    More information on JUnit official website:

    https://junit.org

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