ERLANG QUICKCHECK PDF

Tired of writing and maintaining thousands of automated tests? Let QuickCheck generate new tests for you daily, saving you effort and nailing your bugs earlier! QuickCheck takes you quickly from specification to identified bug. Three steps to QuickCheck Write a QuickCheck specification instead of test cases— general properties your system should always satisfy.

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Note that lists can and most likely will be of variable length. It takes a list of generators as input instead of a list of Erlang terms. Last but not least, eqc comes with the handy? SIZED macro, which can be used to generate elements of a certain type featuring different sizes e. Custom generators You are not limited to use QuickCheck built-in generators. QuickCheck features a set of functions and macros that you can combine to create your very own custom generators.

LET macro lets you bind values from a generator to a variable. It also lets you refine this values by applying functions and or filters onto them. LET L, list int , lists:usort L The above example generates random list of integers without duplicates.

First, random lists of integers which may contain duplicates are generated. Each one of these lists are bound to the variable L, one at a time. It allows you to specify a predicate that must hold true for the value drawn from the specified generator. Otherwise, that value is dropped. Properties QuickCheck properties are always defined by means of the?

This macro takes a variable name, a generator and a predicate and makes sure that the provided predicate holds true for the random sample drawn from the specified generator. Note that? This is useful when one has generators that depend on other generators.

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GONZALO HALFFTER PDF

QuickCheck

Note that lists can and most likely will be of variable length. It takes a list of generators as input instead of a list of Erlang terms. Last but not least, eqc comes with the handy? SIZED macro, which can be used to generate elements of a certain type featuring different sizes e. Custom generators You are not limited to use QuickCheck built-in generators. QuickCheck features a set of functions and macros that you can combine to create your very own custom generators. LET macro lets you bind values from a generator to a variable.

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