@Test
	public void addingALabelLiftsAmbiguity() {
		StreamNode ast = parse("file | out: file");
		assertEquals("file", ast.getModuleNodes().get(0).getLabelName());
		assertEquals("out", ast.getModuleNodes().get(1).getLabelName());

	}
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