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Testing micro services using testkits

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Maxim Novak

The document discusses challenges in testing microservices architecture, highlighting the need for reliable feedback loops and accurate testing of logic and protocols. It offers a structured approach to testing, recommending the use of test doubles and test kits to simulate interactions without relying on external components. Additionally, it emphasizes the importance of creating lightweight test kits that can provide better confidence in the functionality of services.

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Insights on Software Development • Software Testing Insights
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A Better Approach for Testing Micro-Services Introducing: Test Kits in Practice Maxim Novak, Wix Back-end https://github.com/maximn@maximnovakmaximn@wix.com
With Wix you can create a stunning website.
I’m Maxim Novak ▪ Team leader at Wix (4 years) ▪ Building infrastructure services ▪ Over 10 years developing software ▪ TDD and clean code enthusiast Lithuania Vilnius Kyiv Dnipro Wix Engineering Locations Israel Tel-Aviv Be’er Sheva Ukraine
The Integration with your service was the easiest thing I’ve ever done “ ”
- said nobody The Integration with your service was the easiest thing I’ve ever done “ ”
- said nobody , NEVER The Integration with your service was the easiest thing I’ve ever done “ ”
AGENDA Why testing in a microservices architecture is challenging How to approach these challenges
Why testing in a microservices architecture is challenging 01
MONOLITH In the old world, testing was simple. TEST
TEST
TEST
TEST
TEST
TEST
http://3gamma.com/insights/architecting-speed-agile-innovators-accelerate-growth-microservices/ You start like this...
https://www.slideshare.net/BruceWong3/the-case-for-chaos https://twitter.com/adrianco/status/441883572618948608 ...and end up like this. NETFLIX TWITTER ~500 microservices ~500 microservices
Testing with microservices is challenging. You still want... ❏ A short and reliable feedback loop ❏ To test assumptions vs. reality (logic/protocol)
RECAP How we Test
MY APP STORE SESSION (USER ID) USERS SERVER NAME IN THE CONFIRMATION PAGE Example Scenario
SESSION (USER ID) CONFIRMATION PAGE WITH NAME Recap End to End (Out-of-process component tests) MY APP STORE ? TEST
Recap Integration Tests MY APP STORE USER ID ? TEST NAME USERS CLIENT
How to approach it 02
#0 Don’t test (the integration) NOT REALLY, RIGHT? OUR MICRO SERVICE
MY APP STORE TEST USERS CLIENT STUB USERS CLIENT Users SERVER SESSION (USER ID) CONFIRMATION PAGE WITH NAME
MY APP STORE if (isTestMode) { // ... } else { // ... } TEST USERS CLIENT STUB USERS CLIENT SESSION (USER ID) CONFIRMATION PAGE WITH NAME Users SERVER
The real implementation is never tested (well … only in production) MY APP STORE TEST STUB USERS CLIENT SESSION (USER ID) CONFIRMATION PAGE WITH NAME Users SERVERUSERS CLIENT
You DO want an “out of process component tests” (e2e).
Testing micro services using testkits
❏E2E ❏Integration ✘ ✘ #0 Don’t test (the integration) OUR MICRO SERVICE
OUR MICRO SERVICE #1 Run against an external environment
USERS SERVER MY APP STORE SESSION (USER ID) TEST CONFIRMATION PAGE WITH NAME
❏ A short and reliable feedback loop ❏ To test assumptions vs. reality (logic/protocol) BEHAVES AS WE ASSUME ✔ #1 Run against an external environment
❏ A short and reliable feedback loop ❏ To test assumptions vs. reality (logic/protocol) ENSURE COMMUNICATION PROTOCOL & SCHEMA ✔ #1 Run against an external environment
❏ A short and reliable feedback loop ❏ To test assumptions vs. reality (logic/protocol) ✘ ✔ #1 Run against an external environment
Running against external environment is unreliable. It has a high maintenance cost and it adds complexity to your app. Shared state Security Non-happy paths Maintain data Neet it to be in production Flaky Complexity
#1 Run against an external environment OUR MICRO SERVICE ❏E2E ❏Integration ✔✘ ✔✘
#2 Use test doubles STUB / MOCK / FAKE OUR MICRO SERVICE https://martinfowler.com/articles /mocksArentStubs.html HTTP
FAKE USERS SERVER MY APP STORE SESSION (USER ID) TEST NAME IN THE CONFIRMATION PAGE HTTP
Real Service (Provider) Logic 1 (core) DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition
Real Service (Provider) Test Double STUB / MOCK / FAKE Logic 1 (core) DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition A P I
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #2 Use test doubles E2E example
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #2 Use test doubles E2E example
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #2 Use test doubles E2E example
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #2 Use test doubles E2E example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); String result = usersClient.getName(userId); assertEquals(name, result); } #2 Use test doubles IT success example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); String result = usersClient.getName(userId); assertEquals(name, result); } #2 Use test doubles IT success example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); String result = usersClient.getName(userId); assertEquals(name, result); } #2 Use test doubles IT success example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); fakeUsersServer.givenUser(userId, name); String result = usersClient.getName(userId); assertEquals(name, result); } #2 Use test doubles IT success example
@Test(expected = UserNotFoundException.class) public void getName_notFound() { UUID userId = UUID.randomUUID(); fakeUsersServer.givenUserNotFound(userId); usersClient.getName(userId); } #2 Use test doubles IT failure example
@Test(expected = UserNotFoundException.class) public void getName_notFound() { UUID userId = UUID.randomUUID(); fakeUsersServer.givenUserNotFound(userId); usersClient.getName(userId); } #2 Use test doubles IT failure example
@Test(expected = UserNotFoundException.class) public void getName_notFound() { UUID userId = UUID.randomUUID(); fakeUsersServer.givenUserNotFound(userId); usersClient.getName(userId); } #2 Use test doubles IT failure example
@Test(expected = UserNotFoundException.class) public void getName_notFound() { UUID userId = UUID.randomUUID(); fakeUsersServer.givenUserNotFound(userId); usersClient.getName(userId); } #2 Use test doubles IT failure example
#2 Use test doubles ❏ A short and reliable feedback loop ❏ To test assumptions vs. reality (logic/protocol) ✔
#2 Use test doubles ❏ A short and reliable feedback loop ❏ To test assumptions vs. reality (logic/protocol) ✔ ✔✘ WE IMPLEMENT THE TEST DOUBLE IN A WAY WE ASSUME IT WORKS - NOT HOW IT WORKS IN REALITY
Assumptions vs. Reality http://i.imgur.com/oSUaHS7.jpg
ConfirmationPage purchase(UUID userId, List<Item> items) { BigDecimal sum = calculatePrice(items); boolean billedSuccessfully; try{ billUser(userId); billedSuccessfully = true; } catch (StolenCreditCardException ex) { billedSuccessfully = false; } return renderConfirmationPage( userId, sum, billedSuccessfully); } #2 Use test doubles Service Interaction
ConfirmationPage purchase(UUID userId, List<Item> items) { BigDecimal sum = calculatePrice(items); boolean billedSuccessfully; try{ billUser(userId); billedSuccessfully = true; } catch (StolenCreditCardException ex) { billedSuccessfully = false; usersClient.blockUser(userId); } return renderConfirmationPage( userId, sum, billedSuccessfully); } #2 Use test doubles Service Interaction
private ConfirmationPage renderConfirmationPage( UUID userId, BigDecimal sum, boolean billedSuccessfully) { String name = usersClient.getName(userId); //render the page } #2 Use test doubles Service Interaction
private ConfirmationPage renderConfirmationPage( UUID userId, BigDecimal sum, boolean billedSuccessfully) { String name = usersClient.getName(userId); //render the page } #2 Use test doubles Service Interaction UserNotFoundException
#2 Use test doubles CONSUMER CONSUMER CONSUMER CONSUMER CONSUMER CONSUMER ...AND, ALL OUR CONSUMERS WILL HAVE TO IMPLEMENT THEM TOO SERVICE PROVIDER
❏E2E ❏Integration #2 Use test doubles ✘✔ STUB / MOCK / FAKE OUR MICRO SERVICE HTTP ✘✔
OUR MICRO SERVICE # 3 (1 + 2) Record/Replay tests
Pre-recorded MY APP STORE SESSION (USER ID) TEST NAME IN THE CONFIRMATION PAGE HTTP
#3 Record / Replay ● Re-do for every change ● Recording is manual ● Random data in requests (E2E) ● Continuous Integration
#3 Record / Replay CONSUMER CONSUMER CONSUMER CONSUMER CONSUMER CONSUMER ...AND, ALL OUR CONSUMERS WILL HAVE TO RECORD SERVICE PROVIDER
We can do better. HAVE A MUCH HIGHER LEVEL OF CONFIDENCE ❏ A short and reliable feedback loop ❏ To test assumptions vs. reality (logic/protocol) ✔ ✔
A lightweight version of the real thing. OUR MICRO SERVICE #4 Test Kit from Service Provider
USERS TESTKIT MY APP STORE SESSION (USER ID) TEST NAME IN THE CONFIRMATION PAGE
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); User user = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(user); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #4 Test kits E2E example
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); User user = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(user); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #4 Test kits E2E example
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); User user = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(user); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #4 Test kits E2E example
@Test public void purchase_e2e() { UUID userId = UUID.randomUUID(); String name = someName(); User user = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(user); login(userId); addItemToCart(itemId); ConfirmationPage confirmationPage = purchase(); assertThat(confirmationPage, containsName(name)); } #4 Test kits E2E example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(givenUser); String result = usersClient.getName(userId); assertEquals(name, result); } #4 Test kits IT success example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(givenUser); String result = usersClient.getName(userId); assertEquals(name, result); } #4 Test kits IT success example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(givenUser); String result = usersClient.getName(userId); assertEquals(name, result); } #4 Test kits IT success example
@Test public void getName_success() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .build(); usersTestkit.givenUser(givenUser); String result = usersClient.getName(userId); assertEquals(name, result); } #4 Test kits IT success example
@Test(expected = UserNotFoundException.class) public void getName_notFound() { usersClient.getName(UUID.randomUUID()); } #4 Test kits IT failure example
@Test(expected = UserNotFoundException.class) public void getName_notFound() { usersClient.getName(UUID.randomUUID()); } #4 Test kits IT failure example
@Test(expected = UserNotFoundException.class) public void getName_notFound() { usersClient.getName(UUID.randomUUID()); } #4 Test kits IT failure example
@Test(expected = UserNotFoundException.class) public void getName_deactivated() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .isActive(false) .build(); usersTestkit.givenUser(givenUser); usersClient.getName(userId); } #4 Test kits IT special case example
@Test(expected = UserNotFoundException.class) public void getName_deactivated() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .isActive(false) .build(); usersTestkit.givenUser(givenUser); usersClient.getName(userId); } #4 Test kits IT special case example
@Test(expected = UserNotFoundException.class) public void getName_deactivated() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .isActive(false) .build(); usersTestkit.givenUser(givenUser); usersClient.getName(userId); } #4 Test kits IT special case example
@Test(expected = UserNotFoundException.class) public void getName_deactivated() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .isActive(false) .build(); usersTestkit.givenUser(givenUser); usersClient.getName(userId); } #4 Test kits IT special case example
@Test public void getName_deactivated_backoffice() { UUID userId = UUID.randomUUID(); String name = someName(); User givenUser = new UsersTestBuilder() .withId(userId) .withName(name) .isActive(false) .build(); usersTestkit.givenUser(givenUser); String result = usersBackofficeClient.getName(userId); assertEquals(name, result); } #4 Test kits IT special case example
How to build a testkit? OUR MICRO SERVICE
Test doubles Real thing Test kits
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Testkit
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition A P I Testkit
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition A P I Validation Testkit
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) A P I Validation Testkit
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) In Memory DAO A P I Validation Testkit
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) In Memory DAO A P I ValidationTime Testkit
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) In Memory DAO A P I ValidationTime Wiring/ Composition Testkit
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) In Memory DAO A P I ValidationTime Wiring/ Composition Testkit Helpers
testkit.jarservice.jar Logic 1 (core) DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) In Memory DAO A P I ValidationTime Wiring/ Composition Helpers
testkit.jarservice.jar Logic 1 (core) DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) In Memory DAO A P I ValidationTime Wiring/ Composition Helpers
public class UsersTestkit { public void start(int port) { ... } public void stop() { ... } ... What the consumer gets?
public class UsersTestkit { ... public void givenUser(User user) { ... } public void updateUser(UUID userId, UserUpdate user) { ... } } What the consumer gets?
What about next level dependencies? Other services Use test doubles Database Implement in-memory version Cross-test with the real implementation OUR TESTKIT WON’T BRING MORE LEVELS IN THE CHAIN OF SERVICES! OUR MICRO SERVICE
Integration Contract Test We want to make sure that our testkit behaves like the real thing OUR MICRO SERVICE https://martinfowler.com/bliki /IntegrationContractTest.html
INTEGRATION CONTRACT TEST USERS TESTKIT USERS SERVER In Memory DAO MySLQ DAO
Hexagonal Architecture Domain
Hexagonal Architecture Domain
Hexagonal Architecture Domain
USERS SERVER INTEGRATION CONTRACT TEST USERS TESTKIT MY APP STORE SESSION (USER ID) NAME IN THE CONFIRMATION PAGE TEST
You’re able to communicate with your consumers Other services Use test doubles Database Implement in-memory version Cross-test with the real implementation WHEN SOMETHING CHANGES - THEY KNOW ABOUT IT OUR MICRO SERVICE
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Testkit Logic 1 (core) In Memory DAO A P I ValidationTime Wiring/ Composition Helpers
Logic 1 (core) Real Service DAO A P I Validation Logic 2 (internal) Time (real) Wiring/ Composition Logic 1 (core) In Memory DAO A P I ValidationTime Wiring/ Composition TK Logic Testkit Helpers
Disadvantages ➜ More development ➜ Build dependency (on implementation) #4 Test kits OUR MICRO SERVICE
#4 Test kits OUR MICRO SERVICE ❏E2E ❏Integration ✔ ✔
Summary # 0 - Not Testing
Summary # 0 - Not Testing # 1 - External environment
Summary # 0 - Not Testing # 1 - External environment # 2 - Test Doubles
Summary # 0 - Not Testing # 1 - External environment # 2 - Test Doubles # 3 - Record / Replay
Summary # 0 - Not Testing # 1 - External environment # 2 - Test Doubles # 3 - Record / Replay # 4 - Test Kits
Summary # 0 - Not Testing # 1 - External environment # 2 - Test Doubles # 3 - Record / Replay # 4 - Test Kits
API Complexity number of consumers Test Doubles Testkits
Testing micro services using testkits
Thank You https://github.com/maximn@maximnovakmaximn@wix.com

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