Project: RSpec Mocks 3.12

Publisher: RSpec

Mixed responses

Use and_invoke to invoke a callable when a message is received. Pass and_invoke multiple
callables to have different behavior for consecutive calls. The final callable will continue to be
called if the message is received additional times.

Note: The invoked callable will be invoked with the calls arguments, so it is recommended to
use a lambda or similar with the same arity as your method but you can use a proc if you
do not care about arity (e.g. when raising).

Scenarios

Mixed responses

Given

a file named "raises_and_then_returns.rb" with:

RSpec.describe "when the method is called multiple times" do
  it "raises and then later returns a value" do
    dbl = double
    allow(dbl).to receive(:foo).and_invoke(lambda { raise "failure" }, lambda { true })

    expect { dbl.foo }.to raise_error("failure")
    expect(dbl.foo).to eq(true)
  end
end

When

I run rspec raises_and_then_returns.rb

Then

the examples should all pass

Last published 4 months ago by Jon Rowe.

Mixed responses

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