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NOTE THIS POST IS OUTDATED! The project has evolved and can be found here: ErlyMock Some features Easy to use Design based on easymock Works together with otp: can be used even if the clut is called from another process, by invoking mock:verify_after_last_call(Mock,optional: timeout) custom return functions predefined return functions for returning values, receiving message, throwing exceptions, etc.. erlymock automatically purges all modules that were mocked, after verify() Custom argument matchers: %% Orderchecking types: in_order, out_of_order, stub; %% Answering: {return, ...}|{error, ...}|{throw, ...}|{exit, ...}|{rec_msg, Pid}|{function, Fun(Args) -> RetVal} expect(Mock, Type, Module, Function, Arguments, Answer = {AT, _}) when AT==return;AT==error;AT==throw;AT==exit;AT==rec_msg;AT==function -> call(Mock, {expect, Type, Module, Function, length(Arguments), {Arguments, Answer}}). %% this version of expect is suited for useing custom argument matchers expect(Mock, Type, ...