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< Advanced Erlang/OTP ~ erlymock+eunit problems with file, ets |
| jwatte |
 Posted: Sat Oct 09, 2010 6:36 am |
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Joined: 10 Feb 2010
Posts: 34
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I've been using eunit and erlymock (the Jason Wagner version) for testing for a while, and overall, I think they work pretty well!
However, because erlymock uses temporary code replacement for named modules, you can't mock any module that erlymock in turn uses. And, because it uses the compiler to do its dirty work, this means you can't mock things like ets or file, or the internals will try to call the replaced version and badness ensues. (At least, that's what I think is happening)
Here are two cases:
Code: some_test() ->
erlymock:start(),
erlymock:strict(file, delete, ["somename"], [{return, ok}]),
erlymock:replay(),
ok = my_function_that_calls_delete("somename"),
ok = erlymock:verify().
another_test() ->
erlymock:start(),
erlymock:strict(ets, new, [some_table, '_'], [{return, some_table}]),
erlymock:replay(),
ok = my_function_that_calls_ets_new(),
ok = erlymock_verify().
These cases will cause internal errors in erlymock and the subsystems it uses, rather than actually provide mocking for the given modules while testing the functions in question.
Does anyone have any good ideas about what to do about this?
Worst case, I think I can let it call the 'real' ets, because it's fairly fast and non-destructive (except for named tables), but for the file system, that's a lot harder. I really don't want to wrap all file system access into my own module... |
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| jwatte |
| Posted: Tue Nov 09, 2010 5:56 am |
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Joined: 10 Feb 2010
Posts: 34
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What I ended up doing, for the functions I really must have tests for, is pass in the module name to use for file I/O as an argument.
Code: my_fun(Whatever) ->
file:somecall(...).
turns into
Code: my_fun(Whatever) ->
my_fun(Whatever, file).
my_fun(Whatever, File) ->
File:somecall(...).
This allows me to mock an arbitrary module name in erlymock, and pass that in as the "File" module to use:
Code: my_fun_test() ->
erlymock:start(),
erlymoc:strict(test_file, somecall, ...),
erlymock:replay(),
my_fun(whatever, test_file),
erlymock:verify().
Not particularly elegant, and probably less efficient for the compiler, too, but testing and correctness has to go before elegance and performance... |
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| wuji |
| Posted: Fri Sep 14, 2012 6:19 am |
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Joined: 10 Aug 2012
Posts: 654
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| mbtshoes88 |
| Posted: Wed Sep 19, 2012 8:46 am |
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Joined: 18 Sep 2012
Posts: 30
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