public TestRunner addConfig(Map<String, String> config) {
    Preconditions.checkNotNull(config);
    configs.putAll(config);
    return this;
  }
Adds a config to Samza application. This config takes precedence over default configs and descriptor generated configs
@param config configs for the application
@return this {@link TestRunner}
samza-test/src/main/java/org/apache/samza/test/framework/TestRunner.java