Test-Driven Development

with Draven

Extreme Coffee

TDD RULZ

Coderetreat 2010

TDD RULZ

Coderetreat 2010

HOW ARE U?

Fincza András

SVP of Engineering

aka Draven

We are testers!

VS

JUnit ftw!

Classic testing

After implementation, focus on the implementation & algorithm

Classic testing

After implementation, focus on the implementation & algorithm

Test-Driven Development

Tests first, high-quality code via small and verifiable steps

Test-Driven Development

Test-Driven Development

TEST PHASE

describe(`peaceMaker()`, () => {
    it(`should return Peace 
    	when Love and Humanity are given`, () => {
        let result = peaceMaker(`Love`, `Humanity`)
        assert.equal(result, `Peace`)
    })
});
> Test runner

peaceMaker()
 ✘ should return Peace 
    when Love and Humanity are given
    
Test run completed!
  1 out 1 tests failed :(

Test-Driven Development

IMPLEMENTATION
PHASE

describe(`peaceMaker()`, () => {
    it(`should return Peace 
    	when Love and Humanity are given`, () => {
        let result = peaceMaker(`Love`, `Humanity`)
        assert.equal(result, `Peace`)
    })
});

peaceMaker(a, b) => {
  if (a == "Love" && b == "Humanity")
    return "Peace"
}
> Test runner

peaceMaker()
 ✔ should return Peace 
    when Love and Humanity are given

Test-Driven Development

REFACTORING
PHASE

describe(`peaceMaker()`, () => {
    it(`should return Peace 
    	when Love and Humanity are given`, () => {
        let result = peaceMaker(`Love`, `Humanity`)
        assert.equal(result, `Peace`)
    })
});

peaceMaker(componentOfPeace1, componentOfPeace2) =>
  if (componentOfPeace1 == "Love" && 
      componentOfPeace2 == "Humanity")
    return "Peace"
}
> Test runner

peaceMaker()
 ✔ should return Peace 
    when Love and Humanity are given

Test-Driven Development

Test-Driven Development

Ensures small steps

Fast feedback

Less bugs

Great coverage & testable code

Living documentation

Design first

Trust

Test-Driven Development

Let's talk about the costs...

Steep learning curve

Slower

for the first sight

Not for everything

Learning curve

TDD, BLABLA, BLABLA, ...

That's me, Draven!

I'm small

:)

REALITY  VS FAKE NEWS

TV

FAKE NEWS

No Time

:(

Make it!

TV

FAKE NEWS

Do a spike!

How to test it?

TV

FAKE NEWS

Pair up!

It's too hard

:(

TV

FAKE NEWS

I have legacy

:(

Make space!

TV

FAKE NEWS

It's UI,

untestable!

Separation of concerns

TV

FAKE NEWS

I am

MOCKIST!

Just

don't

...

TV

FAKE NEWS

Not fun!

???

TDD

"Moments to learn,

lifetime to master"

THX

Extreme Coffee - TDD 2022.04.01

By drawain

Extreme Coffee - TDD 2022.04.01

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