private ModuleCountMatcher moduleCountForStream(String streamName) {
		return new ModuleCountMatcher(streamName);
	}
Return a matcher that determines if the number of deployed modules
for a stream matches the expected value.

@param streamName name of stream for which to obtain number of deployed modules
@return matcher that determines if the number of modules matches
spring-xd-shell/src/test/java/org/springframework/xd/shell/command/AbstractRuntimeCommandsTests.java