Manuela Munaretto, Gabriele Lana, Filippo Liverani - Women super code lab – Improve your skills with TDD Pair Programming code session | Codemotion Milan 2015

MILAN 20/21.11.2015
Women super code lab: an amazing
opportunity for all the coders to improve
their programming skills in a safe and
thrilling environment.
Manuela Munaretto - XPeppers

MILAN 20/21.11.2015 - Manuela Munaretto
Agenda
25’: welcome and
introduction to the codelab
5’: Pair forming
35’: Session #1
10’: retrospective
35’: Session #2
60’: lunch break
5′: Pair forming
45’: Session #3
5’: break
35’: final retrospective +
Q&A

Our tools
★ Prerequisites
★ TDD
★ 4 rules of simple design
★ Pair Programming

Prerequites: How
1. Prior knowledge of coding
2. Laptop
3. Development Environment
4. Test Libraries

Prerequites: Why
★ Improve your skills
★ Intensive practice event
★ Away from the pressures

Test Driven Development: How
1. Add a little test
2. Run all tests and fail
3. Make a little change
4. Run the tests and succeed
5. Refactor to remove duplication

Test Driven Development: Why
★ What needs to be done
★ Requirements are nailed down
★ Immediate feedback
★ System design
★ Only the features you wanted

4 rules of simple design: How
1. Passes all the tests
2. Expresses every idea that we need to express
3. Contains no duplication
4. Minimal method, classes and modules

4 rules of simple design: Why
★ High cohesion and loose coupling
★ Compact
★ Modular code
★ Expressing all the important ideas of the system

Pair Programming: How
1. Sit side by side in front of the monitor
2. Switch roles often
3. Switch pair daily
4. Appropriate workspace layout
5. Take a break from working together
6. Pair programming is chatting

Pair Programming: Why
★ It’s funny
★ Less frustration
★ More focused
★ Less bugs
★ Higher quality fighting poor practices
★ Continuous code review
★ Collective code ownership

String Calculator: a kata
Kata is often described as a set sequence of karate
moves organized into a pre-arranged fight against
imaginary opponents.
A system of individual training exercises in karate and
other martial arts.

String Calculator: Why
The following is a TDD Kata- an exercise in coding,
refactoring and test-first, that you should apply daily.
Try not to read ahead.
Do one task at a time. The trick is to learn to work
incrementally.
Make sure you only test for correct inputs. There is no
need to test for invalid inputs for this kata

String Calculator: Step 1
Create a simple String calculator with a method int Add
(string numbers)
1. The method can take 0, 1 or 2 numbers, and will
return their sum (for an empty string it will return 0) for
example “” or “1” or “1,2”
2. Start with the simplest test case of an empty string and
move to one and two numbers
3. Remember to solve things as simply as possible so
that you force yourself to write tests you did not think
about
4. Remember to refactor after each passing test

Allow the Add method to handle an unknown amount of
numbers

Allow the Add method to handle new lines between
numbers (instead of commas).
1. the following input is ok: “1n2,3” (will equal 6)
2. the following input is NOT ok: “1,n” (not need to
prove it - just clarifying)

Support different delimiters
1. to change a delimiter, the beginning of the string will
contain a separate line that looks like this: “//
[delimiter]n[numbers…]” for example “//;n1;2” should
return 3 where the default delimiter is ‘;’ .
2. the first line is optional. All existing scenarios should
still be supported

Calling Add with a negative number will throw an
exception “negatives not allowed” - and the negative that
was passed.
If there are multiple negatives, show all of them in the
exception message

Numbers bigger than 1000 should be ignored,
so adding 2 + 1001 = 2

Delimiters can be of any length with the following format:
“//[delimiter]n”
for example:
“//[***]n1***2***3”
should return 6

Allow multiple delimiters like this:
“//[delim1][delim2]n”
for example
“//[*][%]n1*2%3”
should return 6

Make sure you can also handle multiple delimiters with
length longer than one char

Resources
Extreme Programming: A gentle introduction
http://www.extremeprogramming.org/
Test-Driven Development: By Example - Kent Beck
http://www.amazon.
it/dp/0321146530/ref=cm_sw_r_tw_dp_5rgrwb1F002NJ
Cunningham & Cunningham, Inc.
http://c2.com/

Resources
String Calculator
http://osherove.com/tdd-kata-1/

MILAN 20/21.11.2015
Manuela Munaretto - @m_munaretto
manuela.munaretto@xpeppers.com
XPeppers

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Manuela Munaretto, Gabriele Lana, Filippo Liverani - Women super code lab – Improve your skills with TDD Pair Programming code session | Codemotion Milan 2015

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Manuela Munaretto, Gabriele Lana, Filippo Liverani - Women super code lab – Improve your skills with TDD Pair Programming code session | Codemotion Milan 2015