Integration tests

Ideal vs Real on practice in iq

Schedule

• Some words about IQ backend
• Perfect story for me
• Real situation in IQ
• Proposal for discussion

Some words about IQ

IQ BACKEND

• Many requests to side services
• The most important client - frontend
• Some endpoints called by ems events
• Legacy code exists
• DI same as Angular
• Some requirements very complicated and nobody knows what right

IQ BACKEND

Some words about DI (and more next time)

• own DI decorators
• Request scope
• Global scope
• Async-await tokens
• Request tokens
• And more - some middlewares for work in node.js

IQ BACKEND

Some words about TS

• Everything  in IQ typed 
• Some interfaces are very bad  and with spreaded fields
• Some side services hasn't appropriate interfaces
• I need one field for test, but interface has hundred fields 

Perfect story from me

Consumer driver contract

Consumer

Producer

Request

Response

Tests

Tests

Contract

• Requirement from client (endpoint and response)
• Parameters for requirement (request params)
• Performance (artllery.io)
• Quality of code (lint)

Pact - interaction, BDD - scenario

EsLint, TsLint - Quality of code

Pact-defined

Essense of system

Contract

Client

Contract

Tests

Tests

Backend

Auto-generate

Client

Contract

Tests

Tests

Backend

Auto-generate

a = Bool to a = Number

Finally

• Auto-generate tests
• Same contract for clients and backend
• Microservices
• Hierarchy of contracts ( chain of contracts)
  • What about environment?
• Tests run on fully running microservice with all dependencies isolated on docker network
• Database start from prepared snapshoot
• Test endpoint from start to end + performance

Very long process but with different levels

Real situation in iq

Environment

• Dev-ga-02
• Prepared study and other entities
• Some improvements for performance

What do we test

• Fake controller
• Real services
• Fake requests, not working validation

How do we test

• All process
• Function  call fake controller requests

How do we test

• Imitate token
• Imitate Request
• Connection to Db, Redis

Why is it that complicated

• Get, set tokens 
• Get, set configs
• Speed
• Some fake services
• What do you do with integration tests if SIR have broken down?)
• We have problems, but this works

It is perfect but in only one tiny thing