TDD, BDD, RSpec

Presented by Nazia Hossain Nascenia IT www.nascenia.com

Testing in Software Engineering
Testing is to determine if the requirements of the application are met
Classification:
White box testing
Black box testing
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Classification
White Box Testing:
- Tests specific paths through the code
- Tests decision points
Black Box Testing:
- Treats the program like black-box
- Tests specific input & output
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TDD (Test-Driven Development)
Repetition of very short development cycle
Test-first programming concept
Write some code
Run the automated tests and see them succeed
Refactor code
Repeat
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BDD (Behavior-Driven Development)
Encourages collaboration between developers and non-technicals
Clear understanding of desired software behaviour
Combines Test-Driven Development, Domain Driven Design, and Acceptance Test-Driven Planning
Focuses on the reason of why the code should be created
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RSpec
BDD framework for the Ruby Programming Language
Has own mocking framework
Similar to a natural language specification
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Installation RSpec
In Gem-file:
group :test, :development do
gem 'rspec-rails'
end
Install >gem install rspec-rails
Install >bundle install
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Run RSpec
Run >db:migrate
Run >rake rspec
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Run Rspec(cont.)
After installation, there is a RSpec directory
Contains Spec directory of:
Controllers
Helpers
Models
Requests
Routings
Views etc
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Example:
Suppose, One has some dreams, He wants to list them and wish to complete within 10years.
So, he has a Controller like “Dream”,
- Has a Model of the same name.
- Has a view to see the dreams.
We are going to test the controllers, models and views mainly if he makes his dream correctly.
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RSpec with Controllers
Goal is to create very simple, easy to read
One assertion per test
Stub everything (actually we use “Factory girl”)
Emphasis on Controllers and Models to test
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RSpec with Controllers(cont.)
First, add “spec_helper” in the controller spec file. Like, in “dreams_controller_spec”
The file contains:
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails‘
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First, do the things once, that can be repeated many times. Like: at first, create a Dream instance
Then add setup
before(:all) do
@dream = Dream.create!
end
At the end Teardown
after(:all) do
@dream.delete
end
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Suppose, he has a show method, that can show a particular dream
def show
@dream = Dream.find(params[:id])
respond_with(@dream)
End
Simply, finds a “Dream” using a particular “id”, show this with “@dream”
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Now, we’ve to test the show, like,
describe "GET show" do
it "assigns the requested dream as @dream" do
get :show, :id => @dream1.id.to_s
assigns(:dream).should eq(@dream1)
end
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First, “show” is a “GET” method, So, we use to describe “GET show”
Then assigns the “dream” from our test to “@dream” of the controller to test if the match
Now, because the route like, dreams/:id/show
- So, we pass :id => @dream.id
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Then assigns the “@dream” from test controller to “:dream” in controller (they should be equal!)
assigns(:dream) @dream=Dream.find(params[:id])
should eq(@dream1) @dream
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Response with Rspec
Some, responses are given below:
response.should be_success
response.should render_template("complete_form")
response.should redirect_to(dreams_path)
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RSpec with Models
Factory Girl:
Gem, used to create objects
Similar to use fixtures
Factory.define :dream, :class=>Dream do |f|
f.name ‘dreamname1’
end
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RSpec with Models(cont.)
Again, he has a “Dream” Model
So, we have to create a stub “Dream” model to test this
This can be done using factory_girl
Suppose, he has a validation
- “Every Dream should have a name”
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RSpec with Models(cont.)
Describe Dream do
before(:all) do
@dream=Factory(:dream)
end
It “should have name” do
@dream.name=‘’
@dream.should_no be_valid
end
end
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RSpec with Views
Suppose, he wants to view all the dreams and has a “index.html” file
So, again at first, we have to make a stub array of “Dream” model
And if it renders the “index.html” then, the test is succeed
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RSpec with Views(cont.)
describe "dreams/index.html.erb" do
before(:each) do
assign(:dreams, [
stub_model(Dream),
stub_model(Dream)
])
end
it "renders a list of dreams" do
render
end
end
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Rcov
Code coverage tool for Ruby
Viewing overall test unit coverage of target code
Write gem ‘rcov’ in Gemfile
Install> gem install rcov
Run >rake spec:rcov
From “project/coverage/index.html”, we can see the total coverage in percentage
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Rcov Report www.nascenia.com

Thank You
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TDD, BDD, RSpec

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