### Question:
EntityDefaults { @Nullable public static EntityDefaults lookup(EntityType type) { String name = type.getName(); String path = String.format("META-INF/lenskit/entity-defaults/%s.yaml", name); try (InputStream stream = ClassLoaders.inferDefault(EntityDefaults.class) .getResourceAsStream(path)) { if (stream == null) { return null; } ObjectMapper mapper = new ObjectMapper(new YAMLFactory()); DefaultsBean bean = mapper.readValue(stream, DefaultsBean.class); return fromBean(type, bean); } catch (IOException e) { throw new UncheckedIOException("error defaults for " + type, e); } } EntityDefaults(EntityType type, List<TypedName<?>> cols);  EntityDefaults(EntityType type, Collection<TypedName<?>> attrs, List<TypedName<?>> cols,
                          Class<? extends EntityBuilder> bld, List<EntityDerivation> derivs); @Nullable static EntityDefaults lookup(EntityType type); EntityType getEntityType(); TypedName<?> getAttributeDefaults(String name); Set<TypedName<?>> getCommonAttributes(); List<TypedName<?>> getDefaultColumns(); Class<? extends EntityBuilder> getDefaultBuilder(); List<EntityDerivation> getDefaultDerivations();  }### Answer:
@Test public void testMissingDefaults() { EntityDefaults defaults = EntityDefaults.lookup(EntityType.forName("wombat")); assertThat(defaults, nullValue()); }