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CODE QUALITY
AND
TESTABILITY
WITH TDD
TDD - A
SMALL
BACKGROU
ND
 It was created rediscovered by Kent
Beck in 2003, also the creator of
Extreme Programming
 It was one of the first programming
techniques introduced to XP
 Values of XP:
 Simplicity
 Communication
 Feedback
 Respect
 Courage
THREE
RULES OF
TDD
You are not allowed to write any
production code unless it is to
make a failing unit test pass.
You are not allowed to write any
more of a unit test than is
sufficient to fail; and compilation
failures are failures.
You are not allowed to write any
more production code than is
sufficient to pass the one failing
unit test.
HOW CAN TDD
HELP TO
IMPROVE OUR
CODE?
TESTS
WRITTEN
UPFRONT
Better planned solution No more code than
actually needed
Less code complexity Promotes SE principles
such as YAGNI, KISS and
SOLID
 Every TDD cycle includes refactoring
 Safety net for code refactoring
 Fast feedback
HOW CAN TDD
HELP TO
IMPROVE
TESTABILITY?
UNIT TESTS
SHOULD…
Test behaviour, not methods
Be Small and fast
Have good naming
Be well grained
Predictable
Every single method and module in the code base is
testable by default
Tests become granular and easy to read
Each test fail for one reason and one reason
TDD IS
ABOUT
PROBLEM
SOLVING
"Problem solving is the process of
breaking problems down into smaller and
more manageable parts. As the large
problem is broken down into smaller
parts, each part becomes more specific.
These individual solutions to smaller
problems are then combined to solve the
bigger problem. Problem solving is also
referred to as analysing the problem to be
solved."
TDD
IMPROVES
THE
PRODUCT
QUALITY
Tests are
present since
the beginning
Test are driven
by requirements
Test suite
becomes a living
documentation

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Improving code quality and testability wiht TDD

  • 2. TDD - A SMALL BACKGROU ND  It was created rediscovered by Kent Beck in 2003, also the creator of Extreme Programming  It was one of the first programming techniques introduced to XP  Values of XP:  Simplicity  Communication  Feedback  Respect  Courage
  • 3.
  • 4. THREE RULES OF TDD You are not allowed to write any production code unless it is to make a failing unit test pass. You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures. You are not allowed to write any more production code than is sufficient to pass the one failing unit test.
  • 5. HOW CAN TDD HELP TO IMPROVE OUR CODE?
  • 6. TESTS WRITTEN UPFRONT Better planned solution No more code than actually needed Less code complexity Promotes SE principles such as YAGNI, KISS and SOLID
  • 7.  Every TDD cycle includes refactoring  Safety net for code refactoring  Fast feedback
  • 8. HOW CAN TDD HELP TO IMPROVE TESTABILITY?
  • 9.
  • 10. UNIT TESTS SHOULD… Test behaviour, not methods Be Small and fast Have good naming Be well grained Predictable
  • 11.
  • 12. Every single method and module in the code base is testable by default Tests become granular and easy to read Each test fail for one reason and one reason
  • 13.
  • 14.
  • 15.
  • 16. TDD IS ABOUT PROBLEM SOLVING "Problem solving is the process of breaking problems down into smaller and more manageable parts. As the large problem is broken down into smaller parts, each part becomes more specific. These individual solutions to smaller problems are then combined to solve the bigger problem. Problem solving is also referred to as analysing the problem to be solved."
  • 17. TDD IMPROVES THE PRODUCT QUALITY Tests are present since the beginning Test are driven by requirements Test suite becomes a living documentation