/
shared_example_group.feature
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/
shared_example_group.feature
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Feature: shared examples
Shared examples let you describe behaviour of types or modules. When
declared, a shared group's content is stored. It is only realized in the
context of another example group, which provides any context the shared group
needs to run.
A shared group is included in another group using any of:
include_examples "name" # include the examples in the current context
it_behaves_like "name" # include the examples in a nested context
it_should_behave_like "name" # include the examples in a nested context
Scenario: shared examples group included in two groups
Given a file named "collection_spec.rb" with:
"""
require "set"
shared_examples "a collection" do
let(:collection) { described_class.new([7, 2, 4]) }
context "initialized with 3 items" do
it "says it has three items" do
collection.size.should eq(3)
end
end
describe "#include?" do
context "with an an item that is in the collection" do
it "returns true" do
collection.include?(7).should be_true
end
end
context "with an an item that is not in the collection" do
it "returns false" do
collection.include?(9).should be_false
end
end
end
end
describe Array do
it_behaves_like "a collection"
end
describe Set do
it_behaves_like "a collection"
end
"""
When I run `rspec collection_spec.rb --format documentation`
Then the examples should all pass
And the output should contain:
"""
Array
behaves like a collection
initialized with 3 items
says it has three items
#include?
with an an item that is in the collection
returns true
with an an item that is not in the collection
returns false
Set
behaves like a collection
initialized with 3 items
says it has three items
#include?
with an an item that is in the collection
returns true
with an an item that is not in the collection
returns false
"""
Scenario: Providing context to a shared group using a block
Given a file named "shared_example_group_spec.rb" with:
"""
require "set"
shared_examples "a collection object" do
describe "<<" do
it "adds objects to the end of the collection" do
collection << 1
collection << 2
collection.to_a.should eq([1,2])
end
end
end
describe Array do
it_behaves_like "a collection object" do
let(:collection) { Array.new }
end
end
describe Set do
it_behaves_like "a collection object" do
let(:collection) { Set.new }
end
end
"""
When I run `rspec shared_example_group_spec.rb --format documentation`
Then the examples should all pass
And the output should contain:
"""
Array
behaves like a collection object
<<
adds objects to the end of the collection
Set
behaves like a collection object
<<
adds objects to the end of the collection
"""
Scenario: Passing parameters to a shared example group
Given a file named "shared_example_group_params_spec.rb" with:
"""
shared_examples "a measurable object" do |measurement, measurement_methods|
measurement_methods.each do |measurement_method|
it "should return #{measurement} from ##{measurement_method}" do
subject.send(measurement_method).should == measurement
end
end
end
describe Array, "with 3 items" do
subject { [1, 2, 3] }
it_should_behave_like "a measurable object", 3, [:size, :length]
end
describe String, "of 6 characters" do
subject { "FooBar" }
it_should_behave_like "a measurable object", 6, [:size, :length]
end
"""
When I run `rspec shared_example_group_params_spec.rb --format documentation`
Then the examples should all pass
And the output should contain:
"""
Array with 3 items
it should behave like a measurable object
should return 3 from #size
should return 3 from #length
String of 6 characters
it should behave like a measurable object
should return 6 from #size
should return 6 from #length
"""
Scenario: Aliasing "it_should_behave_like" to "it_has_behavior"
Given a file named "shared_example_group_spec.rb" with:
"""
RSpec.configure do |c|
c.alias_it_should_behave_like_to :it_has_behavior, 'has behavior:'
end
shared_examples 'sortability' do
it 'responds to <=>' do
sortable.should respond_to(:<=>)
end
end
describe String do
it_has_behavior 'sortability' do
let(:sortable) { 'sample string' }
end
end
"""
When I run `rspec shared_example_group_spec.rb --format documentation`
Then the examples should all pass
And the output should contain:
"""
String
has behavior: sortability
responds to <=>
"""