minitest-mock-bug.rb

class A
  def self.foo
  end
end

class B < A
end

mock_a = MiniTest::Mock.new
mock_b = MiniTest::Mock.new

A.stub(:foo, mock_a) do
  B.stub(:foo, mock_b) { }
end

A.method(:foo).source # => "  def self.foo\n  end\n"
B.method(:foo).source # => "    metaclass.send :define_method, name do |*args, &blk|\n      if val_or_callable.respond_to? :call then\n        val_or_callable.call(*args, &blk)\n      else\n        blk.call(*block_args) if blk\n        val_or_callable\n      end\n    end\n"