Project: RSpec Mocks 2.6

Publisher: RSpec

stub on any instance of a class

Use any_instance.stub on a class to tell any instance of that class to
return a value (or values) in response to a given message. If no instance
receives the message, nothing happens.

Messages can be stubbed on any class, including those in Ruby's core library.

Scenarios

any_instance stub with a single return value

Given

a file named "example_spec.rb" with:

describe "any_instance.stub" do
  it "returns the specified value on any instance of the class" do
    Object.any_instance.stub(:foo).and_return(:return_value)

    o = Object.new
    o.foo.should eq(:return_value)
  end
end

When

I run rspec example_spec.rb

Then

the examples should all pass

any_instance stub with a hash

Given

a file named "example_spec.rb" with:

describe "any_instance.stub" do
  context "with a hash" do
    it "returns the hash values on any instance of the class" do
      Object.any_instance.stub(:foo => 'foo', :bar => 'bar')

      o = Object.new
      o.foo.should eq('foo')
      o.bar.should eq('bar')
    end
  end
end

When

I run rspec example_spec.rb

Then

the examples should all pass

Last published almost 7 years ago by dchelimsky.

stub on any instance of a class

RSpec Mocks settings