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B"#$v%&'r-Dr%v"(
Pr&)r$**"r
The first steps of a Behaviour-Driven Developer
v0.1-alpha
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Julien Biezemans
@jbpros
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Who?
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You happen to write code...
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useless,
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delivered (too) late,
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fragile,
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difficult to deploy,
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impenetrable,
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hard to maintain.
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BDD
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Dan North
@tastapod
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“BDD is a second-generation, outside-
in, pull-based, multiple-stakeholder,
multiple-scale, high-automation,
agile methodology.”
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“It describes a cycle of interactions
with well-defined outputs, resulting in
the delivery of working, tested
software that matters.”
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Test-Driven
Development
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Red, Green, Refactor
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Where to start?
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What to test?
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Behaviour
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From Test to
Behaviour
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Most important missing
behaviour today?
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Business value
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Story
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As ...
I want ...
So that ...
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Estimation
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Acceptance criteria
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Scenario
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Context ➔ Event ➔ Outcome
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Given ➔ When ➔ Then
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Ubiquitous Language
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BDD in Ruby/Rails
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Stories + Scenarios
=
Cucumber features
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Cucumber
http://github.com/cucumber
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Full-stack, deliverable
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Outside-in
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Acceptance tests
Unit tests
Code
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Run feature
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Missing step definition
#fail
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Write step definition
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features/step_definitions/tamagotchi_steps.rb
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bin/app.rb
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Run feature
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Missing code
#fail
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RSpec
http://github.com/rspec
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Write spec
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spec/lib/tamagotchi_spec.rb
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Run spec
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Missing code
#fail
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Make it pass
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lib/tamagotchi.rb
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Refactor
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Repeat until the
feature passes
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Design
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spec/lib/tamagotchi_spec.rb
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spec/lib/tamagotchi_spec.rb
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lib/tamagotchi.rb
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lib/tamagotchi.rb
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spec/lib/tamagotchi_spec.rb
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Stubs
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spec/lib/tamagotchi_spec.rb
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lib/tamagotchi.rb
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spec/lib/tamagotchi_spec.rb
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spec/lib/tamagotchi_spec.rb
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Spec everything your
step definitions need
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spec/lib/tamagotchi_spec.rb
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lib/tamagotchi.rb
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spec/lib/tamagotchi_spec.rb
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lib/tamagotchi.rb
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features/step_definitions/tamagotchi_steps.rb
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Living documentation
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Ruby on Rails
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View ➔ Controller ➔ Model
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From Programmer
to Developer
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To provide (a machine) with
a set of coded working
instructions.
program v.
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develop v.
To bring out the capabilities
of; bring to a more advanced
or effective state.
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Deliberate discovery
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Know what
you don’t know
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Know what
you don’t know
you don’t know
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Learn the domains
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Learn the tools
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Know the people
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Feedback
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Real options
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Practice
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Your code is now...
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useful,
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delivered on time,
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robust,
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easily deployable,
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intelligible,
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maintainable,
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A piece of software
that matters.
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Don’t deliver features
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Ship
capabilities!