### Question:
DefaultBaggageManager implements BaggageManager { @Override public Baggage.Builder baggageBuilder() { return new NoopBaggageBuilder(); }  static BaggageManager getInstance(); @Override Baggage getCurrentBaggage(); @Override Baggage.Builder baggageBuilder(); @Override Scope withContext(Baggage distContext);  }### Answer:
@Test void builderMethod() { assertThat(DEFAULT_BAGGAGE_MANAGER.baggageBuilder().build().getEntries()).isEmpty(); }
@Test void noopContextBuilder_SetParent_DisallowsNullParent() { Baggage.Builder noopBuilder = DEFAULT_BAGGAGE_MANAGER.baggageBuilder(); assertThrows(NullPointerException.class, () -> noopBuilder.setParent((Baggage) null)); }
@Test void noopContextBuilder_SetParent_DisallowsNullContext() { Baggage.Builder noopBuilder = DEFAULT_BAGGAGE_MANAGER.baggageBuilder(); assertThrows(NullPointerException.class, () -> noopBuilder.setParent((Context) null)); ; }
@Test void noopContextBuilder_SetParent_fromContext() { Baggage.Builder noopBuilder = DEFAULT_BAGGAGE_MANAGER.baggageBuilder(); noopBuilder.setParent(Context.current()); }
@Test void noopContextBuilder_Put_DisallowsNullKey() { Baggage.Builder noopBuilder = DEFAULT_BAGGAGE_MANAGER.baggageBuilder(); assertThrows( NullPointerException.class, () -> noopBuilder.put(null, VALUE, Entry.METADATA_UNLIMITED_PROPAGATION)); }
@Test void noopContextBuilder_Put_DisallowsNullValue() { Baggage.Builder noopBuilder = DEFAULT_BAGGAGE_MANAGER.baggageBuilder(); assertThrows( NullPointerException.class, () -> noopBuilder.put(KEY, null, Entry.METADATA_UNLIMITED_PROPAGATION)); }
@Test void noopContextBuilder_Put_DisallowsNullEntryMetadata() { Baggage.Builder noopBuilder = DEFAULT_BAGGAGE_MANAGER.baggageBuilder(); assertThrows(NullPointerException.class, () -> noopBuilder.put(KEY, VALUE, null)); }
@Test void noopContextBuilder_Remove_DisallowsNullKey() { Baggage.Builder noopBuilder = DEFAULT_BAGGAGE_MANAGER.baggageBuilder(); assertThrows(NullPointerException.class, () -> noopBuilder.remove(null)); }