RSpec: specifying multiple calls to a method with different argument each time

Question

In rspec (1.2.9), what is the correct way to specify that an object will receive multiple calls to a method with a different argument each time?

I ask because of this confusing result:

describe Object do    it "passes, as expected" do     foo = mock('foo')     foo.should_receive(:bar).once.ordered.with(1)     foo.should_receive(:bar).once.ordered.with(2)     foo.bar(1)     foo.bar(2)   end    it "fails, as expected" do     foo = mock('foo')     foo.should_receive(:bar).once.ordered.with(1) # => Mock "foo" expected :bar with (1) once, but received it twice     foo.should_receive(:bar).once.ordered.with(2)     foo.bar(1)     foo.bar(1)     foo.bar(2)   end    it "fails, as expected" do     foo = mock('foo')     foo.should_receive(:bar).once.ordered.with(1)     foo.should_receive(:bar).once.ordered.with(2)     foo.bar(2) # => Mock "foo" received :bar out of order     foo.bar(1)   end    it "fails, as expected, but with an unexpected message" do     foo = mock('foo')     foo.should_receive(:bar).once.ordered.with(1)     foo.should_receive(:bar).once.ordered.with(2)     foo.bar(1)     foo.bar(999) # => Mock "foo" received :bar with unexpected arguments                  # =>   expected: (1)                  # =>         got (999)   end  end 

I expected the last failure message to be "expected: (2)", not "expected (1)". Have I used rspec incorrectly?

Answer 1

Similar to this question. The recommended solution is to call as_null_object to avoid the confusion of messages. So:

describe Object do   it "fails, as expected, (using null object)" do     foo = mock('foo').as_null_object     foo.should_receive(:bar).once.ordered.with(1)     foo.should_receive(:bar).once.ordered.with(2)     foo.bar(1)     foo.bar(999) # => Mock "foo" expected :bar with (2) once, but received it 0 times   end end 

The output is not the same as your second case (i.e. "expected 2 but got 999"), but it does show that the expectation was not met.