Liked TestNG DataProviders but have to use JUnit?

This is an example how to use TestNG like DataProviders in JUnit.

JUnit DataProviders Maven dependency

<dependency>
    <groupId>com.tngtech.java</groupId>
    <artifactId>junit-dataprovider</artifactId>
    <version>1.13.1</version>
    <scope>test</scope>
</dependency>

DataProvider in JUnit tests

First of all you need to annotate your test class with @RunWith(DataProviderRunner.class)

Then create DataProvider

@DataProvider
public static Object[][] sumTestData() {
    return new Object[][]{
            {2, 2, 4},
            {10, 1, 11},
            {1000000, -1000000, 0}
    };
}

To use that data provider you should annotate you test with @UseDataProvider("sumTestData").

JUnit DataProvider example

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;

import com.tngtech.java.junit.dataprovider.DataProvider;
import com.tngtech.java.junit.dataprovider.DataProviderRunner;
import com.tngtech.java.junit.dataprovider.UseDataProvider;

@RunWith(DataProviderRunner.class)
public class JUnitDataProviderExampleIT {

    @DataProvider
    public static Object[][] sumTestData() {
        return new Object[][]{
                {2, 2, 4},
                {10, 1, 11},
                {1000000, -1000000, 0}
        };
    }

    @Test
    @UseDataProvider("sumTestData")
    public void dataProviderTest(int a, int b, int expectedSum) {
        Assert.assertEquals(expectedSum, a + b);
    }

}

It’s working…

… but why doesn’t JUnit support it from the box?

Want to use DataProviders with JUnit and Spring? This is another pain…

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