apollo-mockserver/src/main/java/com/ctrip/framework/apollo/mockserver/EmbeddedApollo.java/EmbeddedApollo/loadConfigFor
class EmbeddedApollo:  private String loadConfigFor(String namespace) {
    String filename = String.format("mockdata-%s.properties", namespace);
    final Properties prop = ResourceUtils.readConfigFile(filename, new Properties());
    Map<String, String> configurations = Maps.newHashMap();
    for (String propertyName : prop.stringPropertyNames()) {
      configurations.put(propertyName, prop.getProperty(propertyName));
    }
    ApolloConfig apolloConfig = new ApolloConfig("someAppId", "someCluster", namespace, "someReleaseKey");

    Map<String, String> mergedConfigurations = mergeOverriddenProperties(namespace, configurations);
    apolloConfig.setConfigurations(mergedConfigurations);
    return GSON.toJson(apolloConfig);
  }