Testing Your Message-Driven Application With Spring

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2 Spring Developer Advocate @Pivotal Trainer @Bottega Interested in ● Domain-Driven Design ● Architecture ● Test-Driven Development About me Twitter: @JakubPilimon Blog: http://pillopl.github.io #dddbyexamples

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4 ● Temporal coupling ● Throttling ● Broadcast/multicast ● Spatial coupling ● Logical coupling Why Messaging?

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5 Why Messaging? CREDIT CARD APPLICATION CONTROLLER APPLY FOR CARD SERVICE CREDIT CARD DOMAIN EVENT PUBLISHER CREDIT CARD REPOSITORY CONSUMER (MAIL, REPORT, ETC)

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8 Why Messaging? CREDIT CARD APPLICATION CONTROLLER APPLY FOR CARD SERVICE CREDIT CARD DOMAIN EVENT PUBLISHER CREDIT CARD REPOSITORY CONSUMER (MAIL, REPORT, ETC) def 'should emit CardGranted when client born in 70s or later'() { when: applyForCardService.apply("89121514667") then: 1 * domainEventsPublisher.publish( { it instanceof CardGranted } ) }

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9 Why Messaging? CREDIT CARD APPLICATION CONTROLLER APPLY FOR CARD SERVICE CREDIT CARD DOMAIN EVENT PUBLISHER CREDIT CARD REPOSITORY CONSUMER (MAIL, REPORT, ETC) @Test public void shouldEmitCardGrantedEvent() { // when cardApplicationController.applyForCard(new CardApplication("70345678")); // then verify(domainEventsPublisher).publish(isA(CardGranted.class)); }

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10 Why Messaging? CREDIT CARD APPLICATION CONTROLLER APPLY FOR CARD SERVICE CREDIT CARD DOMAIN EVENT PUBLISHER CREDIT CARD REPOSITORY CONSUMER (MAIL, REPORT, ETC) def 'should be able to get card when born in 70s or later'() { when: cardApplicationController.applyForCard(new CardApplication("70345678")) then: events.poll().getPayload().contains("card-granted") }

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12 Why Messaging? CREDIT CARD APPLICATION CONTROLLER APPLY FOR CARD SERVICE CREDIT CARD DOMAIN EVENT PUBLISHER CREDIT CARD REPOSITORY CONSUMER (MAIL, REPORT, ETC) label: card_rejected input: triggeredBy: sendRejected() outputMessage: sentTo: channel headers: type: card-application-rejected contentType: application/json body: clientPesel: 86010156812 timestamp: 2018-01-01T12:12:12.000Z matchers: body: - path: $.timestamp type: by_regex predefined: iso_8601_with_offset

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