Download to read offline
More Related Content
Similar to Contract-based Testing Approach as a Tool for Shift Lef
More from Katherine Golovinova
Contract-based Testing Approach as a Tool for Shift Lef
- 1. How we canshift testing left Alisa Petivotova Contract based testing
- 2. • Why • What •When • How • Who 2 AGENDA All about contract based testing
- 3. 3 Let’s talk abouttesting pyramid UI INT UNIT
- 4. 4 UISERVICESDB Web UI Backend DB S1 S2 S3 So howwe can achieve it?
- 5. 5 So how wecan achieve it? UISERVICESDB Web UI BFF DB S1 S2 S3 UISERVICESDB Web UI Backend DB S1 S2 S3
- 6. 6 • Mostly manualsmoke run 10 Manual • Smoke tests run with deploy in TFS • Roll back deploy if tests failed • Testing team responsibility 39 UI • Run with CI (TeamCity) • Use Mocks • Testing team responsibility 296 Integration • Run with CI (TeamCity) • Development team responsibility 911 Unit Test Automation TeamDev Team Manual Test Team Let’s talk about testing pyramid
- 7. 7 Integration test fora microservice • Mock service for any outgoing http call • Receive request and return response • Verify any outgoing calls CleanDB • Clean DB • Create new DB before test run • Clear DB before each test MockServices localhost:1234 TestServer • TestServer • In-memory test server • Able to dispatch requests using HttpClient in-memorylocalhost:3333
- 8. 8 Integration test fora microservice PactBuilder = new PactBuilder(new PactConfig { SpecificationVersion = "2.0.0", Outputters = new XUnitOutput(_output), PactDir = "../PactContracts" }) .ServiceConsumer(consumer) .HasPactWith(provider); MockProviderService = PactBuilder.MockService(port); 1. Start mock service 1234 MockServicesCleanDBTestServer localhost:1234
- 9. 9 Integration test fora microservice var request = new ProviderServiceRequest { Method = HttpVerb.Get, Path = "/search", Query = $"searchText={searchString}" }; var response = new ProviderServiceResponse { Status = 200, Headers = /*content type headers, etc.*/ Body = data }; MockService .Given(testCaseName) .UponReceiving(testCaseAction) .With(request) .WillRespondWith(response); 1. Start mock service 2. Register expected interaction MockServicesCleanDBTestServer localhost:1234
- 10. 10 Testing UI component 1.Build Agents requirements: • Node version installed to match your UI solution to run • Browsers to match your tests requirements 2. Parallel run options: • Docker containers – the easiest way to pass the image • Build agents – pass the files directly from master to child jobs 3. Integration with devs CI pipeline requirements: • Parallel test run under 15 mins • Pass rate 100% UI localhost:3456 Servers localhost:5000
- 11. 00:00 00:15 00:3000:45 01:00 01:15 01:30 01:45 02:00 02:15 02:30 Execution Time UI test execution time Component UI (new approach) System UI E2E (old approach) Let’s compare 11 10x Execution Time 0:00 0:07 0:14 0:21 0:28 0:36 0:43 API tests execution time Integration tests (new approach) API tests (old approach) 15x
- 12. Prevent defects rather than found them 4 Longprocess of ensuring contract 3 2 1 Defects in PROD Mocks did not guarantee correctness 12 Testing contracts – why we started doing this
- 13. Contract Testing isa way to ensure that services can communicate with each other. Consumer Driven Contracts means that contracts are created on consumer side. Pact is a consumer-driven testing tool 13 Testing contracts API API API UI API v1 API v2 Pact (noun): A formal agreement between individuals or parties. “ The country negotiated a trade pact with the US" Synonyms: agreement, protocol, deal, contract ~ Oxford Dictionaries
- 14. A Contract isa collection of agreements between a client (Consumer) and an API (Provider) that describes the interactions that can take place between them. What can be verified: • Response and request structure • Data types and data itself • Status codes and headers Technologies: • Pact.Net • Pact.JS • Pact JVM 14 Testing contracts
- 15. 1. Create contractfrom consumer side PactBuilder.Build(); 2. Publish contract to Pact Broker (or any other location you like) var pactPublisher = new PactPublisher(PactBrokerUrl); pactPublisher.PublishToBroker($"....pacts {Consumer.ToLower()}- {Provider.ToLower()}.json", “1.0.5"); 15 Testing contracts – How To
- 16. 3. Get contractfile (from Pact Broker or any other location you put it to) and verify contract against your service var config = new PactVerifierConfig { Outputters = new List<IOutput>{new XUnitOutput(output)}, PublishVerificationResults = true, ProviderVersion = "0.0.0" }; IPactVerifier pactVerifier = new PactVerifier(config); pactVerifier .ServiceProvider(provider, serviceUri) .HonoursPactWith(consumer) .ProviderState($"{serviceUri}{providerStatesUrl}") .PactUri($"{pactBrokerUrl}/pacts" + $"/provider/{provider}" + $"/consumer/{consumer}/latest") .Verify(); 16 Testing contracts – How To
- 17. 17 Testing contracts –What you’ll get
- 18. 18 Testing contracts –What you’ll get Provider service will respond with:
- 19. 19 Testing contracts -Pact Broker
- 20. 20 Testing contracts -Dependency graph
- 21. 1 PACT isa buggy tool 2Limited functionality for .Net 3 Legacy applications 4Requires vertical integration 5 Convincing others to try 21 Testing contracts - challenges
- 22. 22 What we getUISERVICESDB WebUI BFF DB S1 S2 S3 1 2 3 4 5 7 8 9 10 11 12 13 6 1 Happy Path E2E test 13 Integration tests
- 23. 1 Your Appswill work together 2Continuously evolve codebase 3 No reinvention of the wheel 4Send only what’s needed 5 Get the dependencies graph 23 Testing contracts - benefits
- 24. How to getstarted
- 25.
- 26.