Tweet
Tweet

Slide 1

Slide 1 text

Test smarter, not harder Glasgow PHP meetup – 19 November 2024

Slide 2

Slide 2 text

Marek Matulka Freelance software engineer @super_marek Photo by @cakper

Slide 3

Slide 3 text

Why testing is di cult?

Slide 4

Slide 4 text

Different types of tests Manual testing End-2-end testing UI testing Integration testing Acceptance testing Service testing Unit testing

Slide 5

Slide 5 text

Functional/feature/integration testing Manual testing End-2-end testing UI testing Integration testing Acceptance testing Service testing Unit testing Controller Repository Service A Api Service B Service C

Slide 6

Slide 6 text

Unit testing Manual testing End-2-end testing UI testing Integration testing Acceptance testing Service testing Unit testing Controller Service A Service B Service C

Slide 7

Slide 7 text

(Lack of) speed is not only the issue Fast Reliable Good feedback Grow linearly Force better design Isolated Slow Fragile Poor feedback Grow exponentially Put pressure off design Can simulate user journeys Unit tests Feature/Functional tests

Slide 8

Slide 8 text

Test pyramid Unit Service UI

Slide 9

Slide 9 text

Inverted test pyramid Feature / Functional Integration Service Unit

Slide 10

Slide 10 text

Testing ice-cream cone Feature / Functional Integration Service Unit Manual tests

Slide 11

Slide 11 text

Unit testing

Slide 12

Slide 12 text

Let's implement ticket price calculator ● a simple service that calculates taxes for given route ● tickets with fare information are stored in the local database ● taxes are provided by a third party API for route and fare

Slide 13

Slide 13 text

A quick solution TicketPriceCalculator EntityManager HttpClient

Slide 14

Slide 14 text

A quick solution TicketPriceCalculator EntityManager HttpClient

Slide 15

Slide 15 text

Test doubles

Slide 16

Slide 16 text

Unit testing the calculator TicketPriceCalculator EntityManager HttpClient Don't mock what you don't own!

Slide 17

Slide 17 text

So… I cannot mock it? But I need more Unit test?!

Slide 18

Slide 18 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests

Slide 19

Slide 19 text

Unit testing the calculator TicketPriceCalculator TicketRepository HttpClient

Slide 20

Slide 20 text

Unit testing the calculator TicketPriceCalculator TicketRepository TaxCalculator

Slide 21

Slide 21 text

Unit testing the calculator TicketPriceCalculator TicketRepository TaxCalculator

Slide 22

Slide 22 text

Unit testing the calculator TicketPriceCalculator TicketRepository TaxCalculator

Slide 23

Slide 23 text

Unit testing the calculator TicketPriceCalculator TicketRepository TaxCalculator

Slide 24

Slide 24 text

Unit testing the calculator TicketPriceCalculator TicketRepository TaxCalculator

Slide 25

Slide 25 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests

Slide 26

Slide 26 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests

Slide 27

Slide 27 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests TicketRepository TaxCalculator

Slide 28

Slide 28 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests TicketRepository TaxCalculator DoctrineTicketRepository HttpTaxCalculatorClient

Slide 29

Slide 29 text

Integration test for the repository TicketPriceCalculator TicketRepository TaxCalculator DoctrineTicketRepository

Slide 30

Slide 30 text

Two sides of the contract TicketPriceCalculator TicketRepository TaxCalculator DoctrineTicketRepository ● An interface is a contract ● User of the interface makes an assumption about the behaviour with test doubles ● Implementation of the interface needs to prove it implements the contract fully ● For each expectation in the unit test there should be at least one test to verify that expectation

Slide 31

Slide 31 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests TicketRepository TaxCalculator DoctrineTicketRepository HttpTaxCalculatorClient

Slide 32

Slide 32 text

Unit testing the tax calculator TicketPriceCalculator TicketRepository TaxCalculator DoctrineTicketRepository ExternalApiTaxCalculator ExternalApi ExternalApiHttpClient

Slide 33

Slide 33 text

Unit testing the tax calculator TicketPriceCalculator TicketRepository TaxCalculator DoctrineTicketRepository ExternalApiTaxCalculator ExternalApi ExternalApiHttpClient

Slide 34

Slide 34 text

Integration test for the API TicketPriceCalculator TicketRepository TaxCalculator DoctrineTicketRepository ExternalApiTaxCalculator ExternalApi ExternalApiHttpClient

Slide 35

Slide 35 text

Integration test for the API TicketPriceCalculator TicketRepository TaxCalculator DoctrineTicketRepository ExternalApiTaxCalculator ExternalApi ExternalApiHttpClient

Slide 36

Slide 36 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests TicketRepository TaxCalculator DoctrineTicketRepository HttpTaxCalculatorClient

Slide 37

Slide 37 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests TicketRepository TaxCalculator DoctrineTicketRepository HttpClientExternalApi

Slide 38

Slide 38 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests TicketRepository TaxCalculator DoctrineTicketRepository HttpClientExternalApi ExternalApi

Slide 39

Slide 39 text

TicketPriceCalculator EntityManager HttpClient DB HTTP Integration tests Unit tests TicketRepository TaxCalculator DoctrineTicketRepository HttpClientExternalApi ExternalApiTaxCalculator ExternalApi

Slide 40

Slide 40 text

Hexagonal Architecture Ports & Adapters

Slide 41

Slide 41 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator

Slide 42

Slide 42 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator DoctrineTicketRepository EntityManager

Slide 43

Slide 43 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator DoctrineTicketRepository HttpClientExternalApi EntityManager HttpClient

Slide 44

Slide 44 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator DoctrineTicketRepository HttpClientExternalApi EntityManager HttpClient InMemoryTicketRepository

Slide 45

Slide 45 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator DoctrineTicketRepository HttpClientExternalApi EntityManager HttpClient InMemoryTicketRepository UI

Slide 46

Slide 46 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator DoctrineTicketRepository HttpClientExternalApi EntityManager HttpClient InMemoryTicketRepository UI TicketPriceController Symfony/Laravel

Slide 47

Slide 47 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator DoctrineTicketRepository HttpClientExternalApi EntityManager HttpClient InMemoryTicketRepository UI TicketPriceController Symfony/Laravel BehatContext Behat

Slide 48

Slide 48 text

TicketPriceCalculator TaxCalculator TicketRepository ExternalApi ExternalApiTaxCalculator DoctrineTicketRepository HttpClientExternalApi EntityManager HttpClient InMemoryTicketRepository UI TicketPriceController Symfony/Laravel BehatContext Behat FakeExternalApi

Slide 49

Slide 49 text

How to use fakes in Feature/Functional tests?

Slide 50

Slide 50 text

Using Fake

Slide 51

Slide 51 text

How to use a fake service in Laravel?

Slide 52

Slide 52 text

How to use a fake service in Symfony?

Slide 53

Slide 53 text

How to use a fake service in Laravel?

Slide 54

Slide 54 text

EMPOWER YOUR TESTING

Slide 55

Slide 55 text

Use Behat with examples in Gherkin

Slide 56

Slide 56 text

Write a failing scenario (feature)

Slide 57

Slide 57 text

Write a failing scenario (feature) Write a failing test

Slide 58

Slide 58 text

Write a failing scenario (feature) Write a failing test Make your test pass

Slide 59

Slide 59 text

Write a failing scenario (feature) Write a failing test Make your test pass Refactor your code

Slide 60

Slide 60 text

Write a failing scenario (feature) Write a failing test Make your test pass Refactor your code Repeat the fail-pass-refactor cycle as necessary

Slide 61

Slide 61 text

Write a failing scenario (feature) Write a failing test Make your test pass Refactor your code Make your feature pass

Slide 62

Slide 62 text

Write a failing scenario (feature) Write a failing test Make your test pass Refactor your code Make your feature pass BDD TDD

Slide 63

Slide 63 text

Write a failing scenario (feature) Write a failing test Make your test pass Refactor your code Make your feature pass BDD TDD External Quality Internal Quality

Slide 64

Slide 64 text

Flexible Behat Unit tests Modelling by Example Acceptance tests Use Fakes instead of DB/APIs. Smoke tests Verify critical user paths

Slide 65

Slide 65 text

Thank you 🤗