https://codeberg.org/joeposaurus/
counterstring-codekata#setup-for-the-kata

https://tnyr.me/#JbRuq5JN3d

instructions (15 mins)

the kata (50 mins)

10:35 | break (5 mins) | 10:40

reflect & share (15 mins)

how to apply (30 mins)

wrap-up (5 mins)

experience test-driven development

understand the principles behind TDD

explore how the principles apply to your work

become an expert in TDD

be able to teach devs TDD

apply TDD in your daily work

think of the next step

write a failing test

run the test(s) => red

write just enough code to get the test to pass

run the test(s) => green

refactor => refactor

run the test(s)

The Art of Agile Development (2nd ed.) - James Shore

1. Obvious Implementation

2. Fake It 'Til You Make It

3. Triangulation

1, 2, Fizz, 4, Buzz, Fizz, 7, 8, Fizz, ...

def test_fizzbuzz_1():
	assert fizzbuzz(1) == "1"

def fizzbuzz(length):
	return ""
					

RED - test fails

def test_fizzbuzz_1():
	assert fizzbuzz(1) == "1"

def fizzbuzz(length):
	return "1"
					

GREEN - test passes

def test_fizzbuzz_1():
	assert fizzbuzz(1) == "1"

def fizzbuzz(length):
	return "1"
					

Refactor? - No

def test_fizzbuzz_1():
    assert fizzbuzz(1) == "1"


def test_fizzbuzz_2():
    assert fizzbuzz(2) == "1, 2"


def fizzbuzz(length):
    return "1"
					

RED - test fails

def test_fizzbuzz_1():
    assert fizzbuzz(1) == "1"

def test_fizzbuzz_2():
    assert fizzbuzz(2) == "1, 2"

def fizzbuzz(length):
    if length == 1:
        return "1"
    else:
        return "1, 2"
					

GREEN - tests pass

def test_fizzbuzz_1():
    assert fizzbuzz(1) == "1"

def test_fizzbuzz_2():
    assert fizzbuzz(2) == "1, 2"

def fizzbuzz(length):
    if length == 1:
        return "1"
    else:
        return "1, 2"
					

Refactor? - No

# other tests ommitted from slide

def test_fizzbuzz_3():
    assert fizzbuzz(3) == "1, 2, Fizz"

def fizzbuzz(length):
    if length == 1:
        return "1"
    else:
        return "1, 2"
					

an exercise in programming
which helps hone your skills
through practice and repetition

invented by Dave Thomas

*3*5*7*9*

work in pairs or on your own

disable your coding assistant (if any)

starting point:
a function/method that returns an empty string
a (failing) test for a counterstring of length 1

reference implementation:
https://counterstring.smallsheds.garden

counterstring: *3*5*7*9*

think - red - green - refactor

triangulation

https://counterstring.smallsheds.garden

https://smallsheds.garden/my-talks/

hand signal 🙋

share with another person/group

10 minutes in total

What was different?

What was the same?

What kinds of code do you write?

three/six/nine/... groups

three rounds

rotate after 7 minutes

one person stays for a next round

Where can you apply TDD in your work?

Where do you see challenges?

decide on the next small step
and how you can test it

take the step

test the step

size of steps depends on length feedback loop

size of steps depends on level of confidence

amount of refactoring depends on level of experience