Tests a property and prints the results to stdout.

Args specifies arguments to the QuickCheck driver

Result represents the test result

stdArgs are the default test arguments used

Tests a property, using test arguments, and prints the results to stdout.

Tests a property, using test arguments, produces a test result, and prints the results to stdout.

Tests a property, produces a test result, and prints the results to stdout.

Tests a property and prints the results and all test cases generated to stdout. This is just a convenience function that means the same as quickCheck . verbose.

Tests a property, using test arguments, and prints the results and all test cases generated to stdout. This is just a convenience function that combines quickCheckWith and verbose.

Tests a property, using test arguments, produces a test result, and prints the results and all test cases generated to stdout. This is just a convenience function that combines quickCheckWithResult and verbose.

Tests a property, produces a test result, and prints the results and all test cases generated to stdout. This is just a convenience function that combines quickCheckResult and verbose.

Prints out the generated testcase every time the property is tested, like verboseCheck from QuickCheck 1. Only variables quantified over inside the verbose are printed.

Used to construct generators that depend on the size parameter.

Overrides the size parameter. Returns a generator which uses the given size instead of the runtime-size parameter.

Generates a random element in the given inclusive range.

Promotes a monadic generator to a generator of monadic values.

Generates a value that satisfies a predicate.

Tries to generate a value that satisfies a predicate.

Randomly uses one of the given generators. The input list must be non-empty.

Chooses one of the given generators, with a weighted random distribution. The input list must be non-empty.

Generates one of the given values. The input list must be non-empty.

Takes a list of elements of increasing size, and chooses among an initial segment of the list. The size of this initial segment increases with the size parameter. The input list must be non-empty.

Generates a list of random length. The maximum length depends on the size parameter.

Generates a non-empty list of random length. The maximum length depends on the size parameter.

Generates a list of the given length.

Generates a list of a given length.

Generates an ordered list of a given length.

Generates some example values and prints them to stdout.

Generates some example values.

Random generation and shrinking of values.

Used for random generation of functions.

Generates an integral number. The number can be positive or negative and its maximum absolute value depends on the size parameter.

Generates a fractional number. The number can be positive or negative and its maximum absolute value depends on the size parameter.

Generates an integral number from a bounded domain. The number is chosen from the entire range of the type, but small numbers are generated more often than big numbers. Inspired by demands from Phil Wadler.

Generates an integral number. The number is chosen uniformly from the entire range of the type. You may want to use arbitrarySizedBoundedIntegral instead.

Generates an element of a bounded type. The element is chosen from the entire range of the type.

Returns no shrinking alternatives.

Shrink an integral number.

Shrink a fraction.

Modifies a generator using an integer seed.

Combine two generator perturbing functions, for example the results of calls to variant or coarbitrary.

A coarbitrary implementation for integral numbers.

A coarbitrary implementation for real numbers.

coarbitrary helper for lazy people :-).

Blind x: as x, but x does not have to be in the Show class.

Fixed x: as x, but will not be shrunk.

Ordered xs: guarantees that xs is ordered.

NonEmpty xs: guarantees that xs is non-empty.

Positive x: guarantees that x > 0.

NonZero x: guarantees that x /= 0.

NonNegative x: guarantees that x >= 0.

Smart _ x: tries a different order when shrinking.

Shrink2 x: allows 2 shrinking steps at the same time when shrinking x

Shrinking _ x: allows for maintaining a state during shrinking.

The class of things which can be tested, i.e. turned into a property.

Changes the maximum test case size for a property.

Shrinks the argument to property if it fails. Shrinking is done automatically for most types. This is only needed when you want to override the default behavior.

Implication for properties: The resulting property holds if the first argument is False, or if the given property holds.

Explicit universal quantification: uses an explicitly given test case generator.

Like forAll, but tries to shrink the argument for failing test cases.

Nondeterministic choice: p1 .&. p2 picks randomly one of p1 and p2 to test. If you test the property 100 times it makes 100 random choices.

Conjunction: p1 .&&. p2 passes if both p1 and p2 pass.

Take the conjunction of several properties.

Disjunction: p1 .||. p2 passes unless p1 and p2 simultaneously fail.

Take the disjunction of several properties.

Performs an IO action after the last failure of a property.

Prints a message to the terminal as part of the counterexample.

Performs an IO action every time a property fails. Thus, if shrinking is done, this can be used to keep track of the failures along the way.

Modifies a property so that it is expected to fail for some test cases.

Considers a property failed if it does not complete within the given number of microseconds.

Attaches a label to a property. This is used for reporting test case distribution.

Labels a property with a value:

 collect x = label (show x)

Conditionally labels test case.

Checks that at least the given proportion of the test cases belong to the given class.