foo_spec.rb

def foo1 obj
  obj.bar(1)
  obj.bar(2)
end

def foo2 obj
  obj.bar(2)
end
 
describe "foo1" do
  it "calls bar on obj" do
    obj = mock
    
    obj.should_receive(:bar).with(2)
    obj.should_receive(:bar).with(anything()).any_number_of_times
    
    foo1 obj
  end
end

describe "foo2" do
  it "calls bar on obj" do
    obj = mock
    
    obj.should_receive(:bar).with(2)
    obj.should_receive(:bar).with(anything()).any_number_of_times
    
    foo2 obj
  end
end