### Question:
ClasspathConfigSource extends AbstractConfigSource implements ConfigSource,
                                                                           ParsableSource { public static Builder builder() { return new Builder(); } ClasspathConfigSource(Builder builder); static ClasspathConfigSource create(Config metaConfig); static ClasspathConfigSource create(String resource); static Collection<? super ClasspathConfigSource> createAll(String resource); static List<ConfigSource> createAll(Config metaConfig); static Builder builder(); @Override Optional<Content> load(); @Override String toString(); @Override Optional<String> mediaType(); @Override Optional<ConfigParser> parser();  }### Answer:
@Test public void testBuilder() { ConfigSource configSource = ConfigSources.classpath("application.conf").build(); assertThat(configSource, notNullValue()); }