Automated testing with RSpec

automated testing with RSpec

Fattahul Alam
www.nascenia.com

RSpec

• A popular ruby testing framework
• Less Ruby-like, natural syntax
• Well formatted output

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installation
$ gem install rspec
Fetching: …
Successfully installed rspec-core-2.12.2
Successfully installed diff-lcs-1.1.3
Successfully installed rspec-expectations-2.12.1
Successfully installed rspec-mocks-2.12.1
Successfully installed rspec-2.12.0
5 gems installed

$ rspec --init #in project directory

create spec/spec_helper.rb
create .rspec
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describe block
Source code at lib/user.rb
Specifications at spec/lib/user_spec.rb
spec/lib/user_spec.rb

require 'spec_helper'
describe "A User" do

end

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describe + it

it "is named Matsumoto"
end

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pending

it "is named Matsumoto"
end

$ rspec spec/lib/user_spec.rb
*
Pending:
A User is named Matsumoto
# Not yet implemented
# ./spec/lib/user_spec.rb:4
Finished in 0.00026 seconds
1 example, 0 failures, 1 pending
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describe class

describe User do
it 'is named Matsumoto'
end

user_spec.rb:3:in `<top (required)>': uninitialized constant User
(NameError)

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create class
spec/lib/user_spec.rb lib/user.rb

require 'spec_helper' class User
describe User do #empty class
it 'is named Matsumoto' end
end

*
Pending:
User is named Matsumoto
# Not yet implemented
# ./spec/lib/user_spec.rb:5
1 example, 0 failures, 1 pending
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expectations

require "spec_helper"
require 'user'
describe User do
it 'is named Matsumoto' do
user = User.new
user.name.should == "Matsumoto"
end
end
F
Failures:
1) User is named Matsumoto
Failure/Error: user.name.should == "Matsumoto“
NoMethodError: undefined method `name' for #<User:0x0000000129e540>…
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success!
lib/user.rb
require "spec_helper" class User
require 'user' attr_accessor :name
describe User do
it 'is named Matsumoto' do def initialize
user = User.new
@name = 'Matsumoto'
end end
end end

.
1 example, 0 failures

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expectation (one more!)
spec/lib/user_spec.rb lib/user.rb

require "spec_helper" class User
require 'user' attr_accessor :name,
describe User do :heads
...
it 'has one head' do def initialize
user = User.new @name =
user.heads.should > 0 'Matsumoto'
end @heads = 1
end end
end

..
2 examples, 0 failures
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more matchers

user.fit_for_drive.should == true

user.fit_for_drive.should be_true

user.height.should be < 7.5

user.length.should_not >= 7.5
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pending
it 'is named Matsumoto' #It without body

xit 'is named Matsumoto' do
failed codes
end

it 'is named Matsumoto' do
pending
failed codes
end
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with rails
Gemfile
group :development, :test do
gem 'rspec-rails'
end

$ bundle install

$ rails generate rspec:install
create .rspec
create spec
create spec/spec_helper.rb
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configuration
spec/spec_helper.rb

...
# in spec/support/ and its subdirectories.
Dir[Rails.root.join("spec/support/**/*.rb"
)].each {|f| require f}

RSpec.configure do |config|
# If you prefer to use mocha, flexmock
or RR, uncomment the appropriate line:
# config.mock_with :mocha
config.mock_with :rspec
end
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execution
$ rspec
# runs all _spec.rb file under spec directory

$ rspec spec/models
# runs all specs under a specific directory

$ rspec spec/models/user_spec.rb
# runs a specific spec file

$ rspec spec/models/user_spec.rb:4
# runs the closest example around that line.
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model spec
spec/models/user_spec.rb
describe User do
it "is not valid without name" do
user = User.new
user.should_not be_valid
end
end
F
Failures:
1) User is not valid without name
…
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model spec
spec/models/user_spec.rb app/models/user.rb
require 'spec_helper' class User <
describe User do
it "is not valid without ActiveRecord::Base
name" do …
user = User.new validates :name, presence: true
user.should_not be_valid
end end
end

.
1 example, 0 failures

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hook
spec/models/user_spec.rb spec/models/user_spec.rb
describe User do describe User do
let(:user){ User.new } let(:user){ User.new }
before { user.active! }
it "is active" do
user.active! it "is active" do
user.should be_active user.should be_active
end end

it "can login" do it "can login" do
user.active! user.should be_able_to_login
user.should be_able_to_login end
end end
end

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hook in context
describe User do
let(:user){ User.new }
...
context "with a published profile" do
it "allows profile to be visible by whitelist subscribers" do
user.profile.publish!
...
end

it "does not allow profile to be visible by blacklist subscribers" do
user.profile.publish!
...
end
end
end

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hook in context
describe User do
let(:user){ User.new }
...
context "with a published profile" do
before { user.profile.publish! }

it "allows profile to be visible by whitelist subscribers" do
...
end
it "does not allow profile to be visible by blacklist subscribers"
do
...
end
end
end

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Custom matchers
it { should validate_presence_of(:name) }

it { should ensure_inclusion_of(:age).in_range(18..25) }

it { should have_many(:tweets).dependent(:destroy) }

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Automated testing with RSpec

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