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Project: RSpec Core 3.5

Publisher: RSpec

mock with rspec

RSpec uses its own mocking framework by default. You can also configure it
explicitly if you wish.

Scenarios
  1. Passing message expectation
  2. Failing message expectation
  3. Failing message expectation in pending example (remains pending)
  4. Passing message expectation in pending example (fails)
  5. Accessing `RSpec.configuration.mock_framework.framework_name`
  6. Doubles may be used in generated descriptions
Passing message expectation
Given
a file named "example_spec.rb" with: 
RSpec.configure do |config|
  config.mock_with :rspec
end

RSpec.describe "mocking with RSpec" do
  it "passes when it should" do
    receiver = double('receiver')
    expect(receiver).to receive(:message)
    receiver.message
  end
end
When
I run rspec example_spec.rb
Then
the examples should all pass
Failing message expectation
Given
a file named "example_spec.rb" with: 
RSpec.configure do |config|
  config.mock_with :rspec
end

RSpec.describe "mocking with RSpec" do
  it "fails when it should" do
    receiver = double('receiver')
    expect(receiver).to receive(:message)
  end
end
When
I run rspec example_spec.rb
Then
the output should contain "1 example, 1 failure"
Failing message expectation in pending example (remains pending)
Given
a file named "example_spec.rb" with: 
RSpec.configure do |config|
  config.mock_with :rspec
end

RSpec.describe "failed message expectation in a pending example" do
  it "is listed as pending" do
    pending
    receiver = double('receiver')
    expect(receiver).to receive(:message)
  end
end
When
I run rspec example_spec.rb
Then
the output should contain "1 example, 0 failures, 1 pending"
And
the exit status should be 0
Passing message expectation in pending example (fails)
Given
a file named "example_spec.rb" with: 
RSpec.configure do |config|
  config.mock_with :rspec
end

RSpec.describe "passing message expectation in a pending example" do
  it "fails with FIXED" do
    pending
    receiver = double('receiver')
    expect(receiver).to receive(:message)
    receiver.message
  end
end
When
I run rspec example_spec.rb
Then
the output should contain "FIXED"
Then
the output should contain "1 example, 1 failure"
And
the exit status should be 1
Accessing `RSpec.configuration.mock_framework.framework_name`
Given
a file named "example_spec.rb" with: 
RSpec.configure do |config|
  config.mock_with :rspec
end

RSpec.describe "RSpec.configuration.mock_framework.framework_name" do
  it "returns :rspec" do
    expect(RSpec.configuration.mock_framework.framework_name).to eq(:rspec)
  end
end
When
I run rspec example_spec.rb
Then
the examples should all pass
Doubles may be used in generated descriptions
Given
a file named "example_spec.rb" with: 
RSpec.configure do |config|
  config.mock_with :rspec
end

RSpec.describe "Testing" do
  # Examples with no descriptions will default to RSpec-generated descriptions
  it do
    foo = double("Test")
    expect(foo).to be foo
  end
end
When
I run rspec example_spec.rb
Then
the examples should all pass

Last published about 3 years ago by myronmarston.