mirror of
https://github.com/barrucadu/dejafu.git
synced 2024-11-29 22:22:54 +03:00
3af7d4206d
This lets dejafu test CoCo-style properties, and introduces a
dependency on [leancheck][].
For example, consider this statement about MVars: "using readMVar is
better than a takeMVar followed by a putMVar because the former is
atomic but the latter is not."
This module can test properties like that:
```
sig e = Sig
{ initialise = maybe newEmptyMVar newMVar
, observe = \v _ -> tryReadMVar v
, interfere = \v s -> tryTakeMVar v >>
maybe (pure ()) (void . tryPutMVar v) s
, expr = e
}
> check $ sig (void . readMVar) `equivalentTo`
sig (\v -> takeMVar v >>= putMVar v)
*** Failure: (seed Just ())
left: [(Nothing,Just ())]
right: [(Nothing,Just ()),(Just Deadlock,Just ())]
```
The two expressions are not equivalent, and we get given the
counterexample!
In addition to "equivalentTo", there is also "refines" and
"strictlyRefines" (and negated variants)
[leancheck]: https://hackage.haskell.org/package/leancheck
27 lines
488 B
YAML
Executable File
27 lines
488 B
YAML
Executable File
flags: {}
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packages:
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- concurrency
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- dejafu
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- dejafu-tests
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- hunit-dejafu
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- tasty-dejafu
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# Until test-framework-hunit with HUnit 1.6 support is on Stackage:
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# https://github.com/haskell/test-framework/pull/27
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- location:
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git: https://github.com/haskell/test-framework.git
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commit: 7d9c1a67f41da960152657728da7813c533573f2
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subdirs:
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- hunit
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extra-dep: true
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extra-deps:
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- call-stack-0.1.0
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- HUnit-1.6.0.0
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- leancheck-0.6.2
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resolver: nightly-2016-06-20
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nix:
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packages: [git]
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