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RSpec::Core::Subject::InstanceMethods

Public Instance Methods

should(matcher=nil, message=nil) click to toggle source

When should is called with no explicit receiver, the call is delegated to the object returned by subject. Combined with an implicit subject (see subject), this supports very concise expressions.

Examples

describe Person do
  it { should be_eligible_to_vote }
end
# File lib/rspec/core/subject.rb, line 53
def should(matcher=nil, message=nil)
  self == subject ? self.__should_for_example_group__(matcher) : subject.should(matcher,message)
end
should_not(matcher=nil, message=nil) click to toggle source

Just like should, should_not delegates to the subject (implicit or explicit) of the example group.

Examples

describe Person do
  it { should_not be_eligible_to_vote }
end
# File lib/rspec/core/subject.rb, line 65
def should_not(matcher=nil, message=nil)
  self == subject ? self.__should_not_for_example_group__(matcher) : subject.should_not(matcher,message)
end
subject() click to toggle source

Returns the subject defined by the example group. The subject block is only executed once per example, the result of which is cached and returned by any subsequent calls to subject.

If a class is passed to describe and no subject is explicitly declared in the example group, then subject will return a new instance of that class.

Examples

# explicit subject defined by the subject method
describe Person do
  subject { Person.new(:birthdate => 19.years.ago) }
  it "should be eligible to vote" do
    subject.should be_eligible_to_vote
  end
end

# implicit subject => { Person.new }
describe Person do
  it "should be eligible to vote" do
    subject.should be_eligible_to_vote
  end
end
# File lib/rspec/core/subject.rb, line 30
def subject
  if defined?(@original_subject)
    @original_subject
  else
    @original_subject = instance_eval(&self.class.subject)
  end
end

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