@Test
public void test_putAllLjava_util_Map_Null() {

    PauselessHashMap hashMap = new PauselessHashMap();
    try {
        hashMap.putAll(new MockMapNull());
        fail("Should throw NullPointerException");
    } catch (NullPointerException e) {
        // expected.
    }
    try {
        hashMap = new PauselessHashMap(new MockMapNull());
        fail("Should throw NullPointerException");
    } catch (NullPointerException e) {
        // expected.
    }
}