### Question:
Hints implements Serializable { public Hints() { } Hints();  Hints(@NonNull Hints orig); void set(String key, Serializable value); Optional<Serializable> get(final String key); boolean getBoolean(final String key); @Override String toString(); @Override boolean equals(Object o); Map<String, Serializable> getAll(); static Hints readOnly(); Hints readOnly(boolean ro); static boolean isRepoReadOnly(Hints hints); static Hints readWrite(); static Hints repository(@NonNull URI repoURI); Hints uri(URI repoURI); Hints platform(Platform platform); static final String OBJECTS_READ_ONLY; static final String REMOTES_READ_ONLY; static final String REPOSITORY_URL; static final String REPOSITORY_NAME; static final String PLATFORM; }### Answer:
@Test public void testHints() { Hints hints = new Hints(); assertTrue(hints.getAll().isEmpty()); assertFalse(hints.get("not present").isPresent()); hints.set("key", "myValue"); assertEquals("myValue", hints.get("key").get()); assertFalse(hints.getBoolean("key")); hints.set("key2", true); assertTrue(hints.getBoolean("key2")); }