Paramaterizing Tests

Other topics

Remarks:

One benefit to using parameters is that if one set of data fails, execution will just move to the next set of data instead of stopping the whole test.

Using a Constructor

import static org.junit.Assert.assertThat;
import static org.hamcrest.CoreMatchers.is;
import java.util.*;
import org.junit.*;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class SimpleParmeterizedTest {
    @Parameters
    public static Collection<Object[]> data(){
        return Arrays.asList(new Object[][]{
                {5, false}, {6, true}, {8, true}, {11, false}    
        });
    }
    
    private int input;
    private boolean expected;
    
    public SimpleParmeterizedTest(int input, boolean expected){
        this.input = input;
        this.expected = expected;
    }
    
    @Test
    public void testIsEven(){
        assertThat(isEven(input), is(expected));
    }
}

In data() you supply the data to be used in the tests. Junit will iterate through the data and run the test with each set of data.

Syntax:

  • @RunWith(Parameterized.class) //annotation for test class

    @Parameters//annotation for data

Contributors

Topic Id: 9425

Example Ids: 29198

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