What is JUnit?
JUnit is a Java testing framework. It can be used for both Unit Testing and UI Testing. It is a great tool and fun to use. In this article, I would like to demonstrate how to use this framework in Eclipse IDE for beginners.
Junit 5 comes with Eclipse so all we need to do is add it to our project when we first creating the project.
Steps:
- add Junit to the project.
- add new file -> create a new class file.
- add new file -> create JUnit Test file.
- write some methods in the class.
- create an object of that class inside the Junit Test file.
- use the object to invoke class methods to test inputs and outputs.
//This class has one method which will return a string argument.
public class HelloWorld {
public String printThis(String str){
return str;
}
}
//The JUnit file would look like this
class HelloWord{
//instantiate a HelloWorld object called hello.
HelloWorld hello = new HelloWorld();
//test method names tends to be descriptive
@Test
void should_return_a_same__passing_string_value(){
//one way to think about constructing a test is use these 3 steps
//given (the inputs)
String cake = "chocolate cake";
//when (the actions)
String cakeTest = "chocolate cake";
//then (the results)
assertEquals(cakeTest, hello.printThis(cake) );
//this will pass the test if both values are equal.
}
}
These are the steps to perform a most basic unit test.
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