JUnit Testing

What is JUnit good for?
JUnit is the most popular framework for unit testing in Java, used to write and automate tests.
With JUnit, developers can test individual units or components of their code to ensure that they are working correctly and as intended.
With JUnit, testing can be automated and integrated into common Java build systems.
Writing Tests
Writing Tests
1Open the New wizard (File > New > JUnit Test Case).
2) Select New JUnit 3 test and enter "TestFailure" as the name of your test class: 3You will see a warning message asking you to add the junit library to the build path.
4) Click Finish to create the test class.

Is JUnit just for Java?

JUnit is a unit testing framework for the Java programming language.
JUnit has been important in the development of test-driven development, and is one of a family of unit testing frameworks which is collectively known as xUnit that originated with SUnit.

Is JUnit testing easy?

If you're looking for a simple, widely-used unit testing framework, JUnit is a great choice.
If you need more advanced features like parallel test execution and flexible test configuration, TestNG might be the better option.

JUnit is a unit testing open-source framework for the Java programming language. Java Developers use this framework to write and execute automated tests. In Java, there are test cases that have to be re-executed every time a new code is added.

Manual Testing

If you execute the test cases manually without any tool support, it is known as manual testing. It is time consuming and less reliable. javatpoint.com

Automated Testing

If you execute the test cases by tool support, it is known as automated testing. It is fast and more reliable. javatpoint.com

Annotations For JUnit Testing

The Junit 4.x framework is annotation based, so let's see the annotations that can be used while writing the test cases. @Testannotation specifies that method is the test method. @Test(timeout=1000)annotation specifies that method will be failed if it takes longer than 1000 milliseconds (1 second). @BeforeClassannotation specifies that method will

Methods of Assert Class

The common methods of Assert class are as follows: 1. void assertEquals(boolean expected,boolean actual): checks that two primitives/objects are equal. It is overloaded. 2. void assertTrue(boolean condition): checks that a condition is true. 3. void assertFalse(boolean condition): checks that a condition is false. 4. void assertNull(Object obj): ch

Write The Test Case

Here, we are using JUnit 4, so there is no need to inherit TestCase class. The main testing code is written in the testFindMax() method. But we can also perform some task before and after each test, as you can see in the given program. To run this example, right click on TestLogic class -> Run As -> 1Junit Test. Let's see the output displayed in ec

Correct Program Logic

As you can see, program logic to find the maximum number for the given array is not correct because it doesn't return -1 in case of negative values. The correct program logic is given below: If you run the junit program again, you will see the following output. javatpoint.com

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