contract files

doc.groovy

package doc.messaging

org.springframework.cloud.contract.spec.Contract.make {
		description 'sample docnumber generation contract' 
		label 'label1'
	input {
		messageFrom('generateDoc')
		messageBody([
				docId: 'D111'
		])
	}
	outputMessage {
		sentTo('DocGenerated')
		body([
				"docId"		: value(consumer('D111'), producer(regex('.*'))),
				"docNumber"	: value(consumer('123'),producer(regex('.*')))
		])
	}
}

MessagingTest.java

public class MessagingTest extends DocMessagingBase {

	@Inject ContractVerifierMessaging contractVerifierMessaging;
	@Inject ContractVerifierObjectMapper contractVerifierObjectMapper;

	@Test
	public void validate_invoiceGenerated() throws Exception {
		// given:
			ContractVerifierMessage inputMessage = contractVerifierMessaging.create(
      "{\"docId\":\"D111\"}"
    );

		// when:
			contractVerifierMessaging.send(inputMessage, "generateDoc");

		// then:
			ContractVerifierMessage response = contractVerifierMessaging.receive("DocGenerated");
			assertThat(response).isNotNull();
		DocumentContext parsedJson = JsonPath.parse(contractVerifierObjectMapper.writeValueAsString(response.getPayload()));
		assertThatJson(parsedJson).field("docId").matches(".*");
	assertThatJson(parsedJson).field("docNumber").matches(".*");
}