JUnit 4 tutorials (JUnit 4 tutorial) iv. junit4 parametric Testing

JUnit 4 parameter tests allow testing methods by parameter values in the change range. To test the parameters, follow these steps:

1. Add annotation @ runwith (parameterized. Class) to the test class)
2. Define the parameter to be tested using the variable range parameter value as a private variable.
   
3. Use the private variable declared in the previous step as the input parameter to create the constructor.
4. . Create a public static method using the @ parameters annotation, which returns the variable values to be tested in the form of a set.
5. Use defined private variables to define the test method

JUnit 4 parametric test example

Evennumberchecker. JavaCheck whether the entered number is an even number:

package in.co.javatutorials; /*** @author javatutorials.co.in*/public class EvenNumberChecker {     /**     * Is input number even.     *     * @param i input number     * @return <code>true</code> if input is even number; otherwise return false     */    public boolean isEven(int i) {        if (i % 2 == 0) {            return true;        } else {            return false;        }    }}

Evennumbercheckertest. JavaPerform Parameter Tests on evennumberchecker. Java:

package in.co.javatutorials; import static org.junit.Assert.*; import java.util.Arrays;import java.util.Collection; import org.junit.Test;import org.junit.runner.RunWith;import org.junit.runners.Parameterized;import org.junit.runners.Parameterized.Parameters; /*** @author javatutorials.co.in*/// Step 1@RunWith(Parameterized.class)public class EvenNumberCheckerTest {     // Step 2: variables to be used in test method of Step 5    private int inputNumber;    private boolean isEven;     // Step 3: parameterized constructor    public EvenNumberCheckerTest(int inputNumber, boolean isEven) {        super();        this.inputNumber = inputNumber;        this.isEven = isEven;    }     // Step 4: data set of variable values    @Parameters    public static Collection<Object[]> data() {        Object[][] data = new Object[][] {                { 2, true },                { 5, false },                { 10, false }        };        return Arrays.asList(data);    }     @Test    public void test() {        System.out.println("inputNumber: " + inputNumber + "; isEven: " + isEven);        EvenNumberChecker evenNumberChecker = new EvenNumberChecker();        // Step 5: use variables in test code        boolean actualResult = evenNumberChecker.isEven(inputNumber);        assertEquals(isEven, actualResult);    }}

Sample output

The output in the eclipse JUnit window is:

Sample log output

inputNumber: 2; isEven: trueinputNumber: 5; isEven: falseinputNumber: 10; isEven: false

Source code download

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Tutorial directory navigation

• JUnit testing framework

• JUnit eclipse tutorial

• JUnit 4 Annotation

• JUnit 4 assert Methods)

• JUnit 4 parametric test

• JUnit 4 Test Suite)

• JUnit 4 ignore test (ignore Test)

• JUnit 4 timeout test (timeout Test)

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