### Question:
LanguageDriverRegistry { public void setDefaultDriverClass(Class<?> defaultDriverClass) { register(defaultDriverClass); this.defaultDriverClass = defaultDriverClass; }  void register(Class<?> cls); void register(LanguageDriver instance); LanguageDriver getDriver(Class<?> cls); LanguageDriver getDefaultDriver(); Class<?> getDefaultDriverClass(); void setDefaultDriverClass(Class<?> defaultDriverClass);  }### Answer:
@Test public void setDefaultDriverClass() { registry.setDefaultDriverClass(RawLanguageDriver.class); assertThat(registry.getDefaultDriverClass() == RawLanguageDriver.class).isTrue(); assertThat(registry.getDefaultDriver()).isInstanceOf(RawLanguageDriver.class); }