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Project: RSpec Mocks 3.10

Publisher: RSpec

`stub_chain`

  • @allow-old-syntax

stub_chain is the old way to allow a message chain but carries the
baggage of a global monkey patch on all objects. As with
receive_message_chain, use with care; we recommend treating usage of stub_chain as a
code smell.

Background
Given
a file named "spec/spec_helper.rb" with: 
RSpec.configure do |config|
  config.mock_with :rspec do |mocks|
    mocks.syntax = :should
  end
end
And
a file named ".rspec" with: 
--require spec_helper
Scenarios
Use `stub_chain` on a double
Given
a file named "spec/stub_chain_spec.rb" with: 
RSpec.describe "Using stub_chain on a double" do
  let(:dbl) { double }

  example "using a string and a block" do
    dbl.stub_chain("foo.bar") { :baz }
    expect(dbl.foo.bar).to eq(:baz)
  end

  example "using symbols and a hash" do
    dbl.stub_chain(:foo, :bar => :baz)
    expect(dbl.foo.bar).to eq(:baz)
  end

  example "using symbols and a block" do
    dbl.stub_chain(:foo, :bar) { :baz }
    expect(dbl.foo.bar).to eq(:baz)
  end
end
When
I run rspec spec/stub_chain_spec.rb
Then
the examples should all pass
Use `stub_chain` on any instance of a class
Given
a file named "spec/stub_chain_spec.rb" with: 
RSpec.describe "Using any_instance.stub_chain" do
  example "using a string and a block" do
    Object.any_instance.stub_chain("foo.bar") { :baz }
    expect(Object.new.foo.bar).to eq(:baz)
  end

  example "using symbols and a hash" do
    Object.any_instance.stub_chain(:foo, :bar => :baz)
    expect(Object.new.foo.bar).to eq(:baz)
  end

  example "using symbols and a block" do
    Object.any_instance.stub_chain(:foo, :bar) { :baz }
    expect(Object.new.foo.bar).to eq(:baz)
  end
end
When
I run rspec spec/stub_chain_spec.rb
Then
the examples should all pass

Last published 4 months ago by Jon Rowe.