any_instance behaves like at_least_one_instance for expectations and like every_instance for stubs in mocha

any_instance_mocha.rb

require "spec_helper"

describe "any_instance in mocha" do
  it "should bar" do
    Array.any_instance.stubs(:foo).returns(1)
    [].foo.should eq(1) # Every instance of Array seems to be
    [].foo.should eq(1) # stubbed (as one would expect)
  end

  it "should foo" do
    Array.any_instance.expects(:foo)
    [].foo
    [] # In contrast, this line doesn't fail while I would expect it to
  end
end

# Long story short I see two distinct approaches for stubs and mocks conflated under the 'any_instance' banner
# Perhaps the approach used with stubs is better named 'every_instance' and the one used for expectations
# 'at_least_one_instance'?