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Project: RSpec Mocks 2.99

Publisher: RSpec

stub with a simple return value

Use the stub method on a test double or a real object to tell the object to
return a value (or values) in response to a given message. Nothing happens if
the message is never received.

Scenarios
stub with no return value
Given
a file named "example_spec.rb" with: 
describe "a stub with no return value specified" do
  let(:collaborator) { double("collaborator") }

  it "returns nil" do
    collaborator.stub(:message)
    collaborator.message.should be(nil)
  end
end
When
I run rspec example_spec.rb
Then
the examples should all pass
stubs with return values
Given
a file named "example_spec.rb" with: 
describe "a stub with a return value" do
  context "specified in a block" do
    it "returns the specified value" do
      collaborator = double("collaborator")
      collaborator.stub(:message) { :value }
      collaborator.message.should eq(:value)
    end
  end

  context "specified with #and_return" do
    it "returns the specified value" do
      collaborator = double("collaborator")
      collaborator.stub(:message).and_return(:value)
      collaborator.message.should eq(:value)
    end
  end

  context "specified with a hash passed to #stub" do
    it "returns the specified value" do
      collaborator = double("collaborator")
      collaborator.stub(:message_1 => :value_1, :message_2 => :value_2)
      collaborator.message_1.should eq(:value_1)
      collaborator.message_2.should eq(:value_2)
    end
  end

  context "specified with a hash passed to #double" do
    it "returns the specified value" do
      collaborator = double("collaborator",
        :message_1 => :value_1,
        :message_2 => :value_2
      )
      collaborator.message_1.should eq(:value_1)
      collaborator.message_2.should eq(:value_2)
    end
  end
end
When
I run rspec example_spec.rb
Then
the examples should all pass

Last published over 7 years ago by myronmarston.