private static void doTestSamzaPropertyMultipleStreams(String propertyName, String value, SamzaPropertyAssertion assertion) {
    // systems.<system>.default.stream.<property> where stream id has no specified physical stream
    assertion.doAssertion(new StreamConfig(new MapConfig(ImmutableMap.of(
        String.format(SystemConfig.SYSTEM_DEFAULT_STREAMS_PREFIX_FORMAT, SYSTEM) + propertyName, value,
        // specify the systems for the streams
        String.format(StreamConfig.SYSTEM_FOR_STREAM_ID, STREAM_ID), SYSTEM,
        String.format(StreamConfig.SYSTEM_FOR_STREAM_ID, OTHER_STREAM_ID), SYSTEM))),
        SYSTEM_STREAM);
  }
Tests for Samza property access in which multiple streams are configured.
Only testing cases in which streams may share some properties.
samza-core/src/test/java/org/apache/samza/config/TestStreamConfig.java