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Api Simulation Patterns for Better Testing

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Andrew Morgan
Andrew Morgan

One thing often overlooked in API driven architectures, or even microservice based architectures, is how to reliably simulate APIs that our consumers depend on. If this isn’t done well, inter-service bugs are often not discovered until the end-to-end testing tier, meaning our feedback cycle is extremely slow. Some of the things we may have trouble with are dealing with APIs which change on a regular basis, APIs which are non-deterministic, injecting faults into APIs, tedious to set up stubs and more. In this talk, I’ll be introducing testing problems that we face when dealing with external APIs. Then I’ll be solving them with some practical, take-home examples, leveraging open source API simulation tools in the process. I’ll also be highlighting various anti-patterns that I’ve noticed people adopting over the years, and explain why they should be avoided.

Tecnologia
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@mogronalol API Simulation Patterns for Better Testing 1 Andrew Morgan @mogronalol Spectolabs
@mogronalol 2 About Me Andrew Morgan @mogronalol
@mogronalol 2 About Me • Independent Consultant Andrew Morgan @mogronalol
@mogronalol 2 About Me • Independent Consultant • Microservices / Cloud / Continuous Delivery Andrew Morgan @mogronalol
@mogronalol 2 About Me • Independent Consultant • Microservices / Cloud / Continuous Delivery • InfoQ Editor Andrew Morgan @mogronalol
@mogronalol 4 Agenda
@mogronalol 4 Agenda • The problems with testing API driven architectures
@mogronalol 4 Agenda • The problems with testing API driven architectures • Introduction to API simulation
@mogronalol 4 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns
@mogronalol 4 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns • Data management
@mogronalol 4 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns • Data management • Conclusion
@mogronalol 5 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns • Data management • Conclusion
@mogronalol API-Driven Architecture 6
@mogronalol API-Driven Architecture 6 Application
@mogronalol API-Driven Architecture 6 Application Payment Provider API Call
@mogronalol API-Driven Architecture 6 Application Payment Provider Social Network API Call API Call
@mogronalol Microservices 7
@mogronalol Microservices 7 Flights
@mogronalol Microservices 7 Flights Auth
@mogronalol Microservices 7 Booking Flights Auth
@mogronalol Microservices 7 Payment Booking Flights Auth
@mogronalol Microservices 7 Payment Company Booking Flights Auth
@mogronalol Microservices 7 Payment Company Booking Flights Auth
@mogronalol A natural evolution... 8
@mogronalol Challenges… 9
@mogronalol 10 Airline Booking Application
@mogronalol 10 Airline Booking Application • Microservice architecture
@mogronalol 10 Airline Booking Application • Microservice architecture • Integration with third party services
@mogronalol 10 Airline Booking Application • Microservice architecture • Integration with third party services • Integration with legacy internal services
@mogronalol 10 Airline Booking Application • Microservice architecture • Integration with third party services • Integration with legacy internal services • Heavy resource consumption
@mogronalol 10 Airline Booking Application • Microservice architecture • Integration with third party services • Integration with legacy internal services • Heavy resource consumption • A standard CI/CD pipeline
@mogronalol 11 Resources
@mogronalol 11 Resources Booking
@mogronalol 11 Resources Booking Flights
@mogronalol 11 Resources Booking Flights Rewards
@mogronalol 11 Resources Booking Flights Rewards Payments
@mogronalol 11 Resources Booking Flights Rewards Payments Fraud
@mogronalol 11 Resources Booking Flights Rewards Payments Fraud
@mogronalol 11 Resources Booking Flights Rewards Payments Fraud
@mogronalol 11 Resources Booking Flights Rewards Payments Fraud
@mogronalol 11 Resources Booking Flights Rewards Payments Fraud Cost
@mogronalol 12
@mogronalol 13 Licensing
@mogronalol 13 Licensing Consumer
@mogronalol 13 Licensing Consumer Producer
@mogronalol 13 Licensing Consumer Producer Third party
@mogronalol 13 Licensing Consumer Producer Consumer Third party
@mogronalol 13 Licensing Consumer Producer Consumer Producer Third party
@mogronalol 13 Licensing Consumer Producer Consumer Producer Third party Cost
@mogronalol 14 Rate Limiting
@mogronalol Consumer 14 Rate Limiting
@mogronalol Consumer 14 Rate Limiting Producer
@mogronalol Consumer 14 Rate Limiting Producer
@mogronalol Consumer 14 Rate Limiting Producer Consumer Rate Limited Producer
@mogronalol 15 Flakey Dependencies
@mogronalol 15 Flakey Dependencies Consumer
@mogronalol 15 Flakey Dependencies Consumer Producer
@mogronalol 15 Flakey Dependencies Consumer Producer
@mogronalol 15 Flakey Dependencies Consumer Producer Consumer Producer
@mogronalol 16 Doesn't exist
@mogronalol 16 Doesn't exist Consumer ?
@mogronalol 17 Non Deterministic
@mogronalol 17 Non Deterministic Consumer Booking Service
@mogronalol 17 Non Deterministic Consumer Booking Service { “date” : “2013-01-08”, … }
@mogronalol 17 Non Deterministic assertThat(booking.getDate()) .isEqualTo(LocalDate.of(2013,1,8)); Consumer Booking Service { “date” : “2013-01-08”, … }
@mogronalol 17 Non Deterministic assertThat(booking.getDate()) .isEqualTo(LocalDate.of(2013,1,8)); Consumer Booking Service { “date” : “2013-01-08”, … }
@mogronalol 17 Non Deterministic assertThat(booking.getDate()) .isEqualTo(LocalDate.of(2013,1,8)); Consumer Booking Service { “date” : “2016-02-07”, … }
@mogronalol 18 Fault Injection
@mogronalol 18 Fault Injection Consumer Producer
@mogronalol 18 Fault Injection Consumer Producer Consumer Producer
@mogronalol 18 Fault Injection Consumer Producer Consumer Producer 4xx, 5xx, timeouts
@mogronalol 18 Fault Injection Consumer Producer Consumer Producer 4xx, 5xx, timeouts Operationally challenging to trigger faults
@mogronalol 19 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns • Data management • Conclusion
@mogronalol 20 API Simulation
@mogronalol 20 API Simulation • Emulation of real API
@mogronalol 20 API Simulation • Emulation of real API • Non-intrusive
@mogronalol 20 API Simulation • Emulation of real API • Non-intrusive • Lightweight - or should be
@mogronalol 21 Open Source Tooling
@mogronalol 21 Open Source Tooling
@mogronalol 21 Open Source Tooling
@mogronalol 21 Open Source Tooling
@mogronalol 22 Architecture
@mogronalol 22 Architecture Consumer
@mogronalol 22 Architecture Consumer Producer
@mogronalol 22 Architecture Consumer Producer
@mogronalol Capture Mode Intercept and store requests & responses 22 Architecture Consumer Producer
@mogronalol Simulate Mode 22 Architecture Consumer Replay recorded requests & responses
@mogronalol 23 Creating Data
@mogronalol 24 Creating Data
@mogronalol 25 Forward Proxy
@mogronalol 25 Forward Proxy Consumer
@mogronalol 25 Forward Proxy Consumer Producer
@mogronalol 25 Forward Proxy Consumer Producer Proxy Setting
@mogronalol 26 Reverse Proxy
@mogronalol 26 Reverse Proxy Consumer
@mogronalol 26 Reverse Proxy Consumer Producer
@mogronalol 26 Reverse Proxy Consumer Producer Points to Hoverfly
@mogronalol 26 Reverse Proxy Consumer Producer Reverse Proxy SettingPoints to Hoverfly
@mogronalol 27 Not Mocking Service Under Test Dependant Service Http
@mogronalol 27 Not Mocking Service Under Test Mocking Dependant Service Http
@mogronalol 27 Not Mocking Service Under Test Mocking
@mogronalol 27 Not Mocking Service Under Test Virtual Service
@mogronalol 27 Not Mocking Service Under Test Virtual Service Mocks bleed into the architectural boundary of your application
@mogronalol 28 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns • Data management • Conclusion
@mogronalol 29 Record and replay
@mogronalol 29 Record and replay Consumer
@mogronalol 29 Record and replay Consumer External Producer
@mogronalol 29 Record and replay Consumer External Producer Intercept
@mogronalol 29 Record and replay Consumer External Producer Intercept
@mogronalol 29 Record and replay Consumer Simulate
@mogronalol 30 JUnit Example
@mogronalol 30 JUnit Example @Test
 public void shouldBeAbleToRetrieveABooking() throws URISyntaxException {
 // Given
 final int bookingId = 1;
 
 // When
 final Booking booking = bookingServiceGateway.getBooking(bookingId);
 
 // Then
 assertThat(booking.getCustomer()).isEqualTo(“Andrew Morgan”); assertThat(booking.getDate()).isEqualTo(LocalDate.of(2016,3,1));
 }
@mogronalol 30 JUnit Example @Rule public HoverflyRule hoverflyRule = HoverflyRule.inCaptureMode(“src/test/ resources/external.json”); @Test
 public void shouldBeAbleToRetrieveABooking() throws URISyntaxException {
 // Given
 final int bookingId = 1;
 
 // When
 final Booking booking = bookingServiceGateway.getBooking(bookingId);
 
 // Then
 assertThat(booking.getCustomer()).isEqualTo(“Andrew Morgan”); assertThat(booking.getDate()).isEqualTo(LocalDate.of(2016,3,1));
 }
@mogronalol 31 JUnit Example {
 "data": [
 {
 "request": {
 "path": "/api/bookings/1",
 "method": "GET",
 "destination": "www.my-test.com",
 "query": null,
 "body": ""
 },
 "response": {
 "status": 200,
 "body": “{”customer”:”Andrew Morgan", ”date”: ”2016-03-01”}}}”,
 "headers": {
 "Content-Type": [
 "application/json"
 ]
 }
 }
 }
 ]
 }
@mogronalol 32 JUnit Example @Test
 public void shouldBeAbleToRetrieveABooking() throws URISyntaxException {
 // Given
 final int bookingId = 1;
 
 // When
 final Booking booking = bookingServiceGateway.getBooking(bookingId);
 
 // Then
 assertThat(booking.getCustomer()).isEqualTo(“Andrew Morgan”); assertThat(booking.getDate()).isEqualTo(LocalDate.of(2016,3,1));
 } @Rule public HoverflyRule hoverflyRule = HoverflyRule.inSimulationMode(classpath(“external.json”));
@mogronalol 33 Advantages
@mogronalol 33 Advantages • Isolation
@mogronalol 33 Advantages • Isolation • Flaky dependencies
@mogronalol 33 Advantages • Isolation • Flaky dependencies • Rate limiting
@mogronalol 33 Advantages • Isolation • Flaky dependencies • Rate limiting • Deterministic
@mogronalol 33 Advantages • Isolation • Flaky dependencies • Rate limiting • Deterministic • Licensing
@mogronalol 34 Operations
@mogronalol 34 Operations Consumer External Producer
@mogronalol 34 Operations Consumer External Producer Internal Producer Internal Producer Internal Producer
@mogronalol 34 Operations Consumer Virtual Service Virtual Service Virtual Service Virtual Service
@mogronalol 35 CLI Example
@mogronalol 35 CLI Example $ hoverctl start —proxy-port 8080
@mogronalol 35 CLI Example $ hoverctl start —proxy-port 8080 $ hoverctl import accounts-service-simulation.json
@mogronalol 35 CLI Example $ hoverctl start —proxy-port 8080 $ hoverctl import accounts-service-simulation.json $ hoverctl start —proxy-port 8081
@mogronalol 35 CLI Example $ hoverctl start —proxy-port 8080 $ hoverctl import accounts-service-simulation.json $ hoverctl start —proxy-port 8081 $ hoverctl import payments-service-simulation.json
@mogronalol 35 CLI Example $ hoverctl start —proxy-port 8080 $ hoverctl import accounts-service-simulation.json $ hoverctl start —proxy-port 8081 $ hoverctl import payments-service-simulation.json $ curl http://www.account-service.com/api/v1/accounts/1 —proxy http:// localhost:8080 [{"name":"foo"}]
@mogronalol 35 CLI Example $ hoverctl start —proxy-port 8080 $ hoverctl import accounts-service-simulation.json $ hoverctl start —proxy-port 8081 $ hoverctl import payments-service-simulation.json $ curl http://www.account-service.com/api/v1/accounts/1 —proxy http:// localhost:8080 [{"name":"foo"}] $ curl http://www.payment-service.com/api/v1/payments/1 -proxy http:// localhost:8081 [{“amount":"£23.27"}]
@mogronalol 36
@mogronalol 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol Matchers Method Destination Path Query GET www.foo.com /miss ?token=foo GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 37 Matching
@mogronalol 38 Why Looser Matching?
@mogronalol Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 38 Why Looser Matching?
@mogronalol Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 38 Why Looser Matching?
@mogronalol Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 38 Why Looser Matching? ?token=miss
@mogronalol Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=foo 38 Why Looser Matching? ???
@mogronalol 39 Field Omission
@mogronalol 39 Field Omission Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=bar
@mogronalol 39 Field Omission Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=bar
@mogronalol 39 Field Omission Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=bar
@mogronalol 39 Field Omission Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=bar
@mogronalol 39 Field Omission Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=bar
@mogronalol 39 Field Omission Matcher Method Destination Path Query GET www.foo.com /login ?token=foo Request GET www.foo.com /login ?token=bar
@mogronalol 40 Regex Matching
@mogronalol 40 Regex Matching Matcher Method Destination Path GET www.foo.com /name/john Request GET www.foo.com /name/tim
@mogronalol 40 Regex Matching Matcher Method Destination Path GET www.foo.com /name/john Request GET www.foo.com /name/tim
@mogronalol 40 Regex Matching Matcher Method Destination Path GET www.foo.com /name/john Request GET www.foo.com /name/tim
@mogronalol 40 Regex Matching Matcher Method Destination Path GET www.foo.com /name/john Request GET www.foo.com /name/tim
@mogronalol 40 Regex Matching Matcher Method Destination Path GET www.foo.com /name/john Request GET www.foo.com /name/tim name/(.*) Path Regex
@mogronalol 41 JSON Matching
@mogronalol 41 JSON Matching Matcher Body {“foo” : “bar”} Request {“foo” : “bar”}
@mogronalol 41 JSON Matching Matcher Body {“foo” : “bar”} Request {“foo” : “bar”}
@mogronalol 41 JSON Matching Matcher Body {“foo” : “bar”} Request {“foo” : “bar”} Body JSON
@mogronalol 42 JSON Matching
@mogronalol Matcher Body JSON {“foo” : “bar”, “not” : “important”} Request {“foo” : “bar”} 42 JSON Matching
@mogronalol Matcher Body JSON {“foo” : “bar”, “not” : “important”} Request {“foo” : “bar”} 42 JSON Matching
@mogronalol Matcher Body JSON {“foo” : “bar”, “not” : “important”} Request {“foo” : “bar”} Body JSON loose=true 42 JSON Matching
@mogronalol 43 Additional Matchers
@mogronalol 43 Additional Matchers • XML (Strict and Loose)
@mogronalol 43 Additional Matchers • XML (Strict and Loose) • JSONPath / XPath
@mogronalol 43 Additional Matchers • XML (Strict and Loose) • JSONPath / XPath • …Anything
@mogronalol 44 Scoring
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Match? GET www.foo.com GET www.foo.com /name/tim GET www.foo.com /name/tim ?token=bar 44 Scoring
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Match? GET www.foo.com GET www.foo.com /name/tim GET www.foo.com /name/tim ?token=bar 44 Scoring
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Match? GET www.foo.com GET www.foo.com /name/tim GET www.foo.com /name/tim ?token=bar 44 Scoring Score
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Match? GET www.foo.com GET www.foo.com /name/tim GET www.foo.com /name/tim ?token=bar 44 Scoring Score 2
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Match? GET www.foo.com GET www.foo.com /name/tim GET www.foo.com /name/tim ?token=bar 44 Scoring Score 2 3
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Match? GET www.foo.com GET www.foo.com /name/tim GET www.foo.com /name/tim ?token=bar 44 Scoring Score 2 3 4
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Match? GET www.foo.com GET www.foo.com /name/tim GET www.foo.com /name/tim ?token=bar 44 Scoring Score 2 3 4
@mogronalol 45 Debugging
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Score Match? MISS www.foo.com miss 1 MISS www.foo.com /name/tim 2 GET www.foo.com /name/tim miss 3 45 Debugging
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Score Match? MISS www.foo.com miss 1 MISS www.foo.com /name/tim 2 GET www.foo.com /name/tim miss 3 45 Debugging
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Score Match? MISS www.foo.com miss 1 MISS www.foo.com /name/tim 2 GET www.foo.com /name/tim miss 3 45 Debugging Closest?
@mogronalol Request GET www.foo.com /name/tim ?token=bar Matchers Score Match? MISS www.foo.com miss 1 MISS www.foo.com /name/tim 2 GET www.foo.com /name/tim miss 3 45 Debugging Closest?
@mogronalol 46 Templating
@mogronalol 46 Templating
@mogronalol Path Matcher Response Body 46 Templating
@mogronalol Path Matcher Response Body /name/(.*) {“name”:”john”} 46 Templating
@mogronalol Path Matcher Response Body /name/(.*) {“name”:”john”} Request Path Response Body 46 Templating
@mogronalol Path Matcher Response Body /name/(.*) {“name”:”john”} Request Path Response Body /name/john {“name”:”john”} 46 Templating
@mogronalol Path Matcher Response Body /name/(.*) {“name”:”john”} Request Path Response Body /name/john {“name”:”john”} /name/peter {“name”:”john”} 46 Templating
@mogronalol Path Matcher Response Body /name/(.*) {“name”:”john”} Request Path Response Body /name/john {“name”:”john”} /name/peter {“name”:”john”} 46 Templating {“name”:”{{ Request.Path.[1] }}”}
@mogronalol Path Matcher Response Body /name/(.*) {“name”:”john”} Request Path Response Body /name/john {“name”:”john”} /name/peter {“name”:”john”} 46 Templating {“name”:”{{ Request.Path.[1] }}”} {“name”:”peter”}
@mogronalol 47 Richer Templating
@mogronalol 47 Richer Templating
@mogronalol Type Example URL Output 47 Richer Templating
@mogronalol Type Example URL Output Scheme {{ Request.Scheme }} http://www.foo.com http 47 Richer Templating
@mogronalol Type Example URL Output Scheme {{ Request.Scheme }} http://www.foo.com http Query Param {{ Request.QueryParam.param }} http://www.foo.com?param=bar bar 47 Richer Templating
@mogronalol Type Example URL Output Scheme {{ Request.Scheme }} http://www.foo.com http Query Param {{ Request.QueryParam.param }} http://www.foo.com?param=bar bar Path Param {{ Request.Path.[1] }} http://www.foo.com/foo/ham ham 47 Richer Templating
@mogronalol 48 The Problem of State
@mogronalol 48 The Problem of State
@mogronalol Request Response 48 The Problem of State
@mogronalol Request Response GET www.shopping.com/ basket {} 48 The Problem of State
@mogronalol Request Response GET www.shopping.com/ basket {} POST www.shopping.com/ basket {“item”:”eggs”} 200 48 The Problem of State
@mogronalol Request Response GET www.shopping.com/ basket {} POST www.shopping.com/ basket {“item”:”eggs”} 200 GET www.shopping.com/ basket {} 48 The Problem of State
@mogronalol 49 State
@mogronalol 49 State
@mogronalol Request Response Requires State Transitions State 49 State
@mogronalol Request Response Requires State Transitions State GET www.shopping.com/ basket {} basket == empty 49 State
@mogronalol Request Response Requires State Transitions State GET www.shopping.com/ basket {} basket == empty POST www.shopping.com/ basket {“item”:”eggs ”} 200 basket = eggs 49 State
@mogronalol Request Response Requires State Transitions State GET www.shopping.com/ basket {} basket == empty POST www.shopping.com/ basket {“item”:”eggs ”} 200 basket = eggs GET www.shopping.com/ basket {“item”:”eggs ”} basket == eggs 49 State
@mogronalol 50 SSL Bump
@mogronalol Consumer 50 SSL Bump Producer
@mogronalol Consumer 50 SSL Bump SSL Producer
@mogronalol Consumer 50 SSL Bump Needs to Decrypt & Impersonate SSL Producer
@mogronalol Consumer 50 SSL Bump Needs to Decrypt & Impersonate SSL Producer SSL Again
@mogronalol Consumer 50 SSL Bump Needs to Decrypt & Impersonate SSL Producer SSL Again Generate Fake Self Signed Certificate
@mogronalol Consumer 50 SSL Bump SSL Producer SSL Again MITM Attack Generate Fake Self Signed Certificate
@mogronalol 51 Fault Injection
@mogronalol 51 Fault Injection Consumer External Producer
@mogronalol 51 Fault Injection Consumer External Producer Middleware
@mogronalol 52 Fault Injection
@mogronalol 53 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns • Data management • Conclusion
@mogronalol 54 Stale Data
@mogronalol 54 Stale Data Consumer Virtual Service
@mogronalol 54 Stale Data ConsumerConsumer Virtual Service
@mogronalol 54 Stale Data ConsumerConsumerConsumer Real Service
@mogronalol 55 Ownership
@mogronalol 55 Ownership Own Consumer Own Producer Strategy
@mogronalol 55 Ownership Own Consumer Own Producer Strategy Integration Contract Testing
@mogronalol 56 Integration Contract Testing http://martinfowler.com/bliki/IntegrationContractTest.html
@mogronalol 56 Integration Contract Testing Scheduled Build http://martinfowler.com/bliki/IntegrationContractTest.html
@mogronalol 56 Integration Contract Testing Scheduled Build Reproduce Simulations http://martinfowler.com/bliki/IntegrationContractTest.html
@mogronalol 56 Integration Contract Testing Scheduled Build Reproduce Simulations Diff http://martinfowler.com/bliki/IntegrationContractTest.html
@mogronalol 56 Integration Contract Testing Scheduled Build Reproduce Simulations Diff Integration Testing or Contract Diff http://martinfowler.com/bliki/IntegrationContractTest.html
@mogronalol 56 Integration Contract Testing Scheduled Build Reproduce Simulations Diff No diff? Integration Testing or Contract Diff http://martinfowler.com/bliki/IntegrationContractTest.html
@mogronalol 56 Integration Contract Testing Scheduled Build Reproduce Simulations Diff No diff? Diff? Integration Testing or Contract Diff http://martinfowler.com/bliki/IntegrationContractTest.html
@mogronalol 57 Ownership Own Consumer Own Producer Strategy Integration Contract Testing
@mogronalol 57 Ownership Own Consumer Own Producer Strategy Integration Contract Testing Simulation as First Class Citizen
@mogronalol 58 First Class Simulations
@mogronalol 58 First Class Simulations Run and Capture Service Tests
@mogronalol 58 First Class Simulations Run and Capture Service Tests Transform to simulation
@mogronalol 58 First Class Simulations Run and Capture Service Tests Transform to simulation Publish Virtual Service
@mogronalol 58 First Class Simulations Run and Capture Service Tests Parse Contract Transform to simulation Publish Virtual Service
@mogronalol 58 First Class Simulations Run and Capture Service Tests Parse Contract Transform to simulation Parse Documentati on Publish Virtual Service
@mogronalol 59 Ownership Own Consumer Own Producer Strategy Integration Contract Testing Virtual Service as First Class Citizen
@mogronalol 59 Ownership Own Consumer Own Producer Strategy Integration Contract Testing Consumer Driven Contract Testing Virtual Service as First Class Citizen
@mogronalol 60 Consumer Driven Contracts http://www.martinfowler.com/articles/consumerDrivenContracts.html
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract http://www.martinfowler.com/articles/consumerDrivenContracts.html
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract http://www.martinfowler.com/articles/consumerDrivenContracts.html Generate Producer Stubs
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract http://www.martinfowler.com/articles/consumerDrivenContracts.html Generate Producer Stubs Implement Consumer
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract http://www.martinfowler.com/articles/consumerDrivenContracts.html Generate Producer Stubs Implement Consumer
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract http://www.martinfowler.com/articles/consumerDrivenContracts.html Generate Producer Stubs Generate Producer Contract Tests Implement Consumer
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract Implement Producer http://www.martinfowler.com/articles/consumerDrivenContracts.html Generate Producer Stubs Generate Producer Contract Tests Implement Consumer
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract Implement Producer http://www.martinfowler.com/articles/consumerDrivenContracts.html Generate Producer Stubs Generate Producer Contract Tests Implement Consumer Run Consumer Contract Tests
@mogronalol 60 Consumer Driven Contracts Consumer Defines Contract Implement Producer http://www.martinfowler.com/articles/consumerDrivenContracts.html Generate Producer Stubs Generate Producer Contract Tests Implement Consumer Run Consumer Contract Tests
@mogronalol 61 Consumer Driven Contracts http://www.martinfowler.com/articles/consumerDrivenContracts.html
@mogronalol 61 Consumer Driven Contracts Change producer http://www.martinfowler.com/articles/consumerDrivenContracts.html
@mogronalol 61 Consumer Driven Contracts Change producer http://www.martinfowler.com/articles/consumerDrivenContracts.html Run Consumer Contract Tests
@mogronalol 61 Consumer Driven Contracts Change producer http://www.martinfowler.com/articles/consumerDrivenContracts.html Run Consumer Contract Tests
@mogronalol 62 Tools
@mogronalol 62 Tools
@mogronalol 63 Testing Pyramid End to end Integration / Service Testing Unit Testing
@mogronalol 63 Testing Pyramid End to end Integration / Service Testing Unit Testing Consumer Driven Contract Testing
@mogronalol 63 Testing Pyramid End to end Integration / Service Testing Unit Testing Consumer Driven Contract Testing
@mogronalol 64 Agenda • The problems with testing API driven architectures • Introduction to API simulation • Applying API simulation patterns • Data management • Conclusion
@mogronalol 65 Conclusion
@mogronalol 65 Conclusion • Reduced cost be replacing real resources
@mogronalol 65 Conclusion • Reduced cost be replacing real resources • Improved deployment time with API simulations
@mogronalol 65 Conclusion • Reduced cost be replacing real resources • Improved deployment time with API simulations • Less dependance on end-to-end testing
@mogronalol 65 Conclusion • Reduced cost be replacing real resources • Improved deployment time with API simulations • Less dependance on end-to-end testing • Advanced patterns for simplifying API simulations
@mogronalol 65 Conclusion • Reduced cost be replacing real resources • Improved deployment time with API simulations • Less dependance on end-to-end testing • Advanced patterns for simplifying API simulations • Improved feedback cycle
@mogronalol Questions? 66 @mogronalol andrewmorgan36@gmail.com https://github.com/mogronalol hoverfly.io

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Api Simulation Patterns for Better Testing