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Project: RSpec Mocks 2.12

Publisher: RSpec

expect a message

Use should_receive() to set an expectation that a receiver should receive a
message before the example is completed.

Scenarios
  1. expect a message
  2. expect a message with an argument
  3. provide a return value
expect a message
Given
a file named "spec/account_spec.rb" with: 
require "account"

describe Account do
  context "when closed" do
    it "logs an account closed message" do
      logger = double("logger")
      account = Account.new
      account.logger = logger

      logger.should_receive(:account_closed)

      account.close
    end
  end
end
And
a file named "lib/account.rb" with: 
class Account
  attr_accessor :logger

  def close
    logger.account_closed
  end
end
When
I run rspec spec/account_spec.rb
Then
the output should contain "1 example, 0 failures"
expect a message with an argument
Given
a file named "spec/account_spec.rb" with: 
require "account"

describe Account do
  context "when closed" do
    it "logs an account closed message" do
      logger = double("logger")
      account = Account.new
      account.logger = logger

      logger.should_receive(:account_closed).with(account)

      account.close
    end
  end
end
And
a file named "lib/account.rb" with: 
class Account
  attr_accessor :logger

  def close
    logger.account_closed(self)
  end
end
When
I run rspec spec/account_spec.rb
Then
the output should contain "1 example, 0 failures"
provide a return value
Given
a file named "message_expectation_spec.rb" with: 
describe "a message expectation" do
  context "with a return value" do
    context "specified in a block" do
      it "returns the specified value" do
        receiver = double("receiver")
        receiver.should_receive(:message) { :return_value }
        receiver.message.should eq(:return_value)
      end
    end

    context "specified with and_return" do
      it "returns the specified value" do
        receiver = double("receiver")
        receiver.should_receive(:message).and_return(:return_value)
        receiver.message.should eq(:return_value)
      end
    end
  end
end
When
I run rspec message_expectation_spec.rb
Then
the output should contain "2 examples, 0 failures"

Last published about 6 years ago by alindeman.