@Test
	public void testTuplePropertyAccessorProjection() throws Exception {
		FileSink sink = newFileSink().binary(true);
		HttpSource source = newHttpSource();

		stream().create(
				generateStreamName(),
				"%s | json-to-tuple | transform --expression=payload.entities.hashtags.![text].toString() | %s",
				source, sink);
		String tweet = "{\"created_at\":\"Tue Aug 27 18:17:06 +0000 2013\",\"id\":100000,\"text\":\"whocares\",\"retweet_count\":0,"
				+
				"\"entities\":{\"hashtags\":[{\"text\":\"hello\",\"indices\":[23,41]},{\"text\":\"there\",\"indices\":[45,50]}],\"symbols\":[],"
				+
				"\"urls\":[],\"user_mentions\":[]},"
				+
				"\"favorited\":false,\"retweeted\":false,\"possibly_sensitive\":false,\"filter_level\":\"medium\",\"lang\":\"bg\"}";

		source.ensureReady().postData(tweet);

		assertThat(sink, eventually(hasContentsThat(equalTo("[hello, there]"))));
	}
This tests that we have Json property access out of the box.
spring-xd-shell/src/test/java/org/springframework/xd/shell/command/AbstractSpelPropertyAccessorIntegrationTests.java