These are the slides of my presentation at Agiles 2014. Link to the talk: http://agiles2014.sched.org/event/75e37d1ff07889d60d102b1386e0358d#.VElttb5gvww

1. The Transformation
Priority Premise
Fernando Di Bartolo
Ágiles 2014, Medellín, Colombia
@fdibartolo

2. disclaimer

3. failing test
make it pass
refactor
TDD cycle

4. 22
4 Rules of TDD
1
3
√
√ As the tests get more specific
√
the code gets more generic

5. word wrap kata
https://github.com/fdibartolo/agiles_2014
ref: http://codingdojo.org/cgi-bin/index.pl?KataWordWrap

6. !
{} nil no code at all to code that employs nil
nil constant
constant constant+ a simple constant to a more complex constant
constant scalar replacing a constant with a variable or an argument
statement statements adding more unconditional statements
unconditional if splitting the execution path
scalar array
array container
statement recursion
if while
expression function replacing an expression with a function or algorithm
variable assignment replacing the value of a variable
There are likely others
http://blog.8thlight.com/uncle-bob/2013/05/27/TheTransformationPriorityPremise.html

7. !
{} nil no code at all to code that employs nil
nil constant
constant constant+ a simple constant to a more complex constant
constant scalar replacing a constant with a variable or an argument
statement statements adding more unconditional statements
unconditional if splitting the execution path
scalar array
array container
statement recursion
if while
expression function replacing an expression with a function or algorithm
variable assignment replacing the value of a variable
There are likely others
http://blog.8thlight.com/uncle-bob/2013/05/27/TheTransformationPriorityPremise.html

8. !
{} nil no code at all to code that employs nil
nil constant
constant constant+ a simple constant to a more complex constant
constant scalar replacing a constant with a variable or an argument
statement statements adding more unconditional statements
unconditional if splitting the execution path
scalar array
array container
statement recursion
if while
expression function replacing an expression with a function or algorithm
variable assignment replacing the value of a variable
There are likely others
http://blog.8thlight.com/uncle-bob/2013/05/27/TheTransformationPriorityPremise.html

9. !
{} nil no code at all to code that employs nil
nil constant
constant constant+ a simple constant to a more complex constant
constant scalar replacing a constant with a variable or an argument
statement statements adding more unconditional statements
unconditional if splitting the execution path
scalar array
array container
statement recursion
if while
expression function replacing an expression with a function or algorithm
variable assignment replacing the value of a variable
There are likely others
http://blog.8thlight.com/uncle-bob/2013/05/27/TheTransformationPriorityPremise.html

10. !
{} nil no code at all to code that employs nil
nil constant
constant constant+ a simple constant to a more complex constant
constant scalar replacing a constant with a variable or an argument
statement statements adding more unconditional statements
unconditional if splitting the execution path
scalar array
array container
statement recursion
if while
expression function replacing an expression with a function or algorithm
variable assignment replacing the value of a variable
There are likely others
http://blog.8thlight.com/uncle-bob/2013/05/27/TheTransformationPriorityPremise.html

11. variable assignment replacing the value of a variable
unconditional if splitting the execution path

12. impasses

13. Thanks!
fernando.di.bartolo
@fdibartolo