@Parameters(name = "{index}: Test count nulls in {0} Should be {1}")
    public static Collection<Object[]> data() {
        return Arrays.asList(new Object[][]{
                {Arrays.asList(1, 2, 3, 4), 0L},
                {Arrays.asList(1, 2, 3, null), 1L},
                {Arrays.asList(null, null), 2L}
        });
    }
Test data

@return parameters for test
test/org.jkiss.dbeaver.test.platform/src/org/jkiss/dbeaver/model/data/aggregate/FunctionCountNullsTest.java