### Question:
ObjectUtil { public static boolean allNull(final Object... o1s) { if (o1s != null && o1s.length > 0) { for (final Object o1 : o1s) { if (o1 != null) { return false; } } } return true; } private  ObjectUtil(); static boolean equalsValue(final Integer i1, final Integer i2); static boolean equalsValue(final BigDecimal bd1, final BigDecimal bd2); static boolean equalsValue(final Object o1, final Object o2); static boolean equalsAny(final Object o1, final Object... o2s); static boolean equalsAll(final Object o1, final Object... o2s); static boolean notEqualsAny(final Object o1, final Object... o2s); static boolean anyNull(final Object... o1s); static boolean allNull(final Object... o1s); static boolean atLeastOneNotNull(final Object... o1s); static boolean noneNull(final Object... o1s);  }### Answer:
@Test public void testAllNull() { assertThat(ObjectUtil.allNull()).isTrue(); assertThat(ObjectUtil.allNull(null)).isTrue(); assertThat(ObjectUtil.allNull(null, null, null)).isTrue(); assertThat(ObjectUtil.allNull(null, 1, null)).isFalse(); assertThat(ObjectUtil.allNull(1, 1, null)).isFalse(); assertThat(ObjectUtil.allNull(1, 1, 1)).isFalse(); }