Iterate through JUnit Test Case with Array and Constant Value

Question

I would like to create a JUnit Test Case that creates a case for every iteration of an array. How do I go about doing this? I've seen some docs about @Parameterized.Parameters but it seems like I will need to reconstruct my original array to look like {{array[0], constantValue}, {array[1], constantValue}}. Is there any way I can get JUnit to do the following:

public class Testing {

String[] array;
String constantValue;

@Test
public void test_arrayValue0() {
   assertEquals(array[0] + " is true", true, method(array[0], constantValue));
}

@Test
public void test_arrayValue1() {
   assertEquals(array[1] + "is true", true, method(array[1], constantValue));
}


@Test
public void test_arrayValue2() {
   assertEquals(array[2] + " is true", true, method(array[2], constantValue));
}
//..until array is complete
}

Stefan Birkner · Accepted Answer · 2015-01-21 20:02:35Z

You need to parameterize your test with the array values (and optionally indices):

@RunWith(Parameterized.class)
public class Testing {
    private final static String constantValue = "myConstant";

    @Parameters
    public static Object[][] params() { 
         return new Object[][]{ 
                new Object[] { "item0", 0 },
                new Object[] { "item1", 1 },
                //...
         };
    }

    @Param(0)
    public String arrayValue;

    @Param(1)
    public int arrayIndex;

    @Test
    public void test_arrayValue() {
        assertEquals("array" + arrayIndex + " is true", true, method(arrayValue, constantValue));
    }
}

Then your test_arrayValue will be called as many times as you supplied parameters, each time with your next pair of index and value you specified.

Alternatively, you can define you array just a field:

private final String[] array = new String[] {"item0", "item1", ... }

And then parameterize your test with an index only.

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