Added a test to ensure that transformer is working fine

spring-cloud-contract-stub-runner/spring-cloud-contract-stub-runner-messaging/spring-cloud-contract-stub-runner-stream/src/test/groovy/org/springframework/cloud/contract/stubrunner/messaging/stream/StubRunnerStreamTransformerSpec.groovy

@@ -92,4 +92,41 @@ class StubRunnerStreamTransformerSpec extends Specification {
 		then:
 			result.payload == '''{"id":"99","temperature":"123.45"}'''
 	}
+
+	def 'should parse dsl without DslProperty'() {
+		given:
+			Contract contract = Contract.make  {
+				// Human readable description
+				description 'Sends an order message'
+				// Label by means of which the output message can be triggered
+				label 'send_order'
+				// input to the contract
+				input {
+					// the contract will be triggered by a method
+					triggeredBy('orderTrigger()')
+				}
+				// output message of the contract
+				outputMessage {
+					// destination to which the output message will be sent
+					sentTo('orders')
+					// any headers for the output message
+					headers {
+						header('contentType': 'application/json')
+					}
+					// the body of the output message
+					body(
+							orderId: value(
+									consumer('40058c70-891c-4176-a033-f70bad0c5f77'),
+									producer(regex('([0-9|a-f]*-*)*'))),
+							description: "This is the order description"
+					)
+				}
+			}
+			StubRunnerStreamTransformer streamTransformer = new StubRunnerStreamTransformer(contract)
+		when:
+			def result = streamTransformer.transform(message)
+		then:
+			result.payload == '''{"orderId":"40058c70-891c-4176-a033-f70bad0c5f77","description":"This is the order description"}'''
+	}
+
 }