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.
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.
@RunWith(Parameterized.class) //annotation for test class
@Parameters//annotation for data