@Test
    public void testSetValueToNullArray() {
        ArraySource sourceBean = new ArraySource();
        ArrayDest arrayDest = mapper.map(sourceBean, ArrayDest.class, "single");
        Assert.assertEquals(1, arrayDest.getArray().length);
        Assert.assertNull("Element must contain null", arrayDest.getArray()[0]);
    }
Test shows how simple array grows, when dest array is not null
core/src/test/java/com/github/dozermapper/core/functional_tests/CollectionTest.java