@Test
	public void expressions_xd159_3() {
		StreamNode ast = parse("foo |  transform --expression='new StringBuilder(payload).reverse()' | bar");
		ModuleNode mn = ast.getModule("transform");
		Properties props = mn.getArgumentsAsProperties();
		assertEquals("new StringBuilder(payload).reverse()", props.get("expression"));
	}
Parse streams and verify either the correct abstract syntax tree is produced or the current exception comes out.

@author Andy Clement
@author David Turanski
spring-xd-dirt/src/test/java/org/springframework/xd/dirt/stream/dsl/StreamConfigParserTests.java