### Question:
ObjectMultistack { public boolean isEmpty(String keyName) { return !map.containsKey(keyName); } ObjectMultistack(); void push(String keyName, ValueWrapper valueWrapper); ValueWrapper pop(String keyName); ValueWrapper peek(String keyName); boolean isEmpty(String keyName);  }### Answer:
@Test void testIsEmptyOfEmptyEntry() { assertTrue(createObjectMultistackWithNEntries(0, "key").isEmpty("key")); }
@Test void testIsEmptyOfNonEmptyEntry() { assertFalse(createObjectMultistackWithNEntries(5, "key").isEmpty("key")); }