module RSpec::Its

Constants

VERSION

Public Instance Methods

is_expected() click to toggle source
# File lib/rspec/its.rb, line 120
def is_expected
  expect(__its_subject)
end
its(attribute, *options, &block) click to toggle source

Creates a nested example group named by the submitted `attribute`, and then generates an example using the submitted block.

@example

# This ...
describe Array do
  its(:size) { should eq(0) }
end

# ... generates the same runtime structure as this:
describe Array do
  describe "size" do
    it "should eq(0)" do
      subject.size.should eq(0)
    end
  end
end

The attribute can be a `Symbol` or a `String`. Given a `String` with dots, the result is as though you concatenated that `String` onto the subject in an expression.

@example

describe Person do
  subject do
    Person.new.tap do |person|
      person.phone_numbers << "555-1212"
    end
  end

  its("phone_numbers.first") { should eq("555-1212") }
end

When the subject is a `Hash`, you can refer to the Hash keys by specifying a `Symbol` or `String` in an array.

@example

describe "a configuration Hash" do
  subject do
    { :max_users => 3,
      'admin' => :all_permissions.
      'john_doe' => {:permissions => [:read, :write]}}
  end

  its([:max_users]) { should eq(3) }
  its(['admin']) { should eq(:all_permissions) }
  its(['john_doe', :permissions]) { should eq([:read, :write]) }

  # You can still access to its regular methods this way:
  its(:keys) { should include(:max_users) }
  its(:count) { should eq(2) }
end

With an implicit subject, `is_expected` can be used as an alternative to `should` (e.g. for one-liner use)

@example

describe Array do
  its(:size) { is_expected.to eq(0) }
end

You can pass more than one arguments on the `its` block to add some options to the generated example

@example

# This ...
describe Array do
  its(:size, :focus) { should eq(0) }
end

# ... generates the same runtime structure as this:
describe Array do
  describe "size" do
    it "should eq(0)", :focus do
      subject.size.should eq(0)
    end
  end
end

Note that this method does not modify `subject` in any way, so if you refer to `subject` in `let` or `before` blocks, you're still referring to the outer subject.

@example

describe Person do
  subject { Person.new }
  before { subject.age = 25 }
  its(:age) { should eq(25) }
end
# File lib/rspec/its.rb, line 102
def its(attribute, *options, &block)
  its_caller = caller.select {|file_line| file_line !~ %r(/lib/rspec/its) }
  describe(attribute.to_s, :caller => its_caller) do
    let(:__its_subject) do
      if Array === attribute
        if Hash === subject
          attribute.inject(subject) {|inner, attr| inner[attr] }
        else
          subject[*attribute]
        end
      else
        attribute_chain = attribute.to_s.split('.')
        attribute_chain.inject(subject) do |inner_subject, attr|
          inner_subject.send(attr)
        end
      end
    end

    def is_expected
      expect(__its_subject)
    end

    def should(matcher=nil, message=nil)
      RSpec::Expectations::PositiveExpectationHandler.handle_matcher(__its_subject, matcher, message)
    end

    def should_not(matcher=nil, message=nil)
      RSpec::Expectations::NegativeExpectationHandler.handle_matcher(__its_subject, matcher, message)
    end

    options << { :caller => its_caller }
    example(nil, *options, &block)

  end
end
should(matcher=nil, message=nil) click to toggle source
# File lib/rspec/its.rb, line 124
def should(matcher=nil, message=nil)
  RSpec::Expectations::PositiveExpectationHandler.handle_matcher(__its_subject, matcher, message)
end
should_not(matcher=nil, message=nil) click to toggle source
# File lib/rspec/its.rb, line 128
def should_not(matcher=nil, message=nil)
  RSpec::Expectations::NegativeExpectationHandler.handle_matcher(__its_subject, matcher, message)
end