Isolated & Integrated tests

A mindset change

Aritz Águila Díaz

About me

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@duiraritz

Aritz Águila Díaz

Co-organizer

Owner

Head of QA

Quality Engineer

Now

  1. A bit of context
     
  2. What are the differences
     
  3. Isolated code examples
     
  4. Pros & Cons
     
  5. When to use each

What are we going to talk about 

Strategy inheritance

Testing has evolved alongside software development but we still apply "traditional" strategies.

Reactive Strategy

Dev reactive flow example

This makes testing not entirely efficient and affects team productivity.

Preventive Strategy

Preventive dev flow example

Isolated tests

  1. A bit of context
     
  2. What are the differences
     
  3. Isolated code examples
     
  4. Pros & Cons
     
  5. When to use each

What are we going to talk about 

Tests that require a real communication or integration with other collaborator.

Integrated tests

Integrated tests types

  • Integration tests.
     
  • Functional or E2E tests.
     
  • Performance tests.
    ...

Possible problems

Poor traceability

Poor feedback

Flaky tests

Long testing time

Tests that don't require a real communication or integration with other collaborator.

Isolated tests

Isolated tests types

  • Unit tests.
     
  • Contract tests.
     
  • Integration tests.
     
  • Functional or E2E tests.
     
  • Performance tests.
    ...
  1. A bit of context
     
  2. What are the differences
     
  3. Isolated code examples
     
  4. Pros & Cons
     
  5. When to use each

What are we going to talk about 

The App

SUT architecture

Nobel prize storage app

Back isolated testing

Nobel prize storage service

Back contract tests

package prizes.getPrizes.successfully

import org.springframework.cloud.contract.spec.Contract

Contract.make {
  request {
    method('GET')
      url('/nobel_prizes/v1/')
  }
  response {
    status OK()
  ...

Contract

  • First step: API definition.
     
  • TDD approach.
     
  • Parallel development of the client and the service.
     
  • Controller tests.
version: "3.1"

services:
  back_test_web:
    depends_on:
      - back_test_db
      - back_test_wiremock
    build:
      dockerfile: ./src/e2eTest/resources/docker/Dockerfile
    ...

Docker-compose

@Test void
should_get_nobel_prizes() {

  //Call to api first time
  given()
  .when()
  .contentType(ContentType.JSON)
  .get(nobelPrizesApiUrl)
  .then()
  .statusCode(200);

  ...
}

E2E test

  • No deployment needed.
     
  • No external collaborator needed.
     
  • Reduced test time.
     
  • Early stage feedback.

Back e2e tests

Front isolated testing

Nobel prize front

version: "3.1"
services:
  stubs:
    image: spring-cloud-contract-stub-runner:2.1.2.RELEASE
    environment:
      - STUBRUNNER_IDS=...infrastructure:+:stubs:9876
      - STUBRUNNER_STUBS_MODE=LOCAL
    volumes:
      - ~/.m2:/root/.m2
      ...

Docker-compose stub runner

E2E test

context('Navigation', () => {
  it('search a nobel prize by category and years', () => {
    const category = 'physics'
    const from = '2018'
    const to = '2019'

    cy.get('[data-test=search-category]').type(category
    ...
  })
})

Front e2e tests

  • No deployment needed.
     
  • No external collaborator needed.
  • Reduced test time.
     
  • Early stage feedback.

Isolated SUT architecture

Nobel prize storage app

  1. A bit of context
     
  2. What are the differences
     
  3. Isolated code examples
     
  4. Pros & Cons
     
  5. When to use each

What are we going to talk about 

Isolated

Integrated

  • Poor maintainability.
  • Poor traceability.
  • Flaky tests.
  • Long testing time.
  • More tech knowledge.
  • Not launched through a real environment.
  • Launched through a real environment.
  • Poor maintainability.
  • Poor traceability.
  • Flaky tests.
  • Long testing time.
  1. A bit of context
     
  2. What are the differences
     
  3. Isolated code examples
     
  4. Pros & Cons
     
  5. When to use each

What are we going to talk about 

Both are complementary.

 

Balanced and defined test strategy based on product requirements.

 

Use for acceptance and regression tests in a development stage in order to get a quick feedback.

Isolated tests

Use as support in order to get a more complete quality status.

Integrated tests

Based on test confidence

Based on test time

Based on test flakiness

Q&A

time

Thanks!!

Isolated & Integrated tests - A Mindset change

By Aritz Águila

Isolated & Integrated tests - A Mindset change

We will see the difference between integrated and isolated tests. Theory and code.

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