Module strategy

Defines the core traits used by Proptest.

Modules

statics

Modified versions of the normal strategy combinators which take specialised traits instead of normal functions.

Structs

BoxedStrategy

A boxed Strategy trait object as produced by Strategy::boxed().

CheckStrategySanityOptions

Options passed to check_strategy_sanity().

Filter

Strategy and ValueTree filter adaptor.

FilterMap

Strategy and ValueTree filter_map adaptor.

FilterMapValueTree

ValueTree corresponding to FilterMap.

Flatten

Adaptor that flattens a Strategy which produces other Strategys into a Strategy that picks one of those strategies and then picks values from it.

FlattenValueTree

The ValueTree produced by Flatten.

Fuse

Adaptor for Strategy and ValueTree which guards simplify() and complicate() to avoid contract violations.

IndFlatten

Similar to Flatten, but does not shrink the input strategy.

IndFlattenMap

Similar to Map plus Flatten, but does not shrink the input strategy and passes the original input through.

Just

A Strategy which always produces a single value value and never simplifies.

LazyJust

A Strategy which always produces a single value value and never simplifies. If T is Clone, you should use Just instead.

LazyValueTree

Represents a value tree that is initialized on the first call to any methods.

Map

Strategy and ValueTree map adaptor.

MapInto

Strategy and ValueTree map into adaptor.

NoShrink

Wraps a Strategy or ValueTree to suppress shrinking of generated values.

Perturb

Strategy perturbation adaptor.

PerturbValueTree

ValueTree perturbation adaptor.

Recursive

Return type from Strategy::prop_recursive().

SBoxedStrategy

A boxed Strategy trait object which is also Sync and Send, as produced by Strategy::sboxed().

Shuffle

Strategy shuffle adaptor.

ShuffleValueTree

ValueTree shuffling adaptor.

TupleUnion

Similar to Union, but internally uses a tuple to hold the strategies.

TupleUnionValueTree

ValueTree type produced by TupleUnion.

Union

A Strategy which picks from one of several delegate Strategys.

UnionValueTree

ValueTree corresponding to Union.

Traits

Shuffleable

A value which can be used with the prop_shuffle combinator.

Strategy

A strategy for producing arbitrary values of a given type.

ValueTree

A generated value and its associated shrinker.

Functions

check_strategy_sanity

Run some tests on the given Strategy to ensure that it upholds the simplify/complicate contracts.

float_to_weight

Convert a floating-point weight in the range (0.0,1.0) to a pair of weights that can be used with Union and similar.

Type Aliases

LazyJustFn

Shorthand for LazyJust<T, fn () -> T>.

NewTree

A new ValueTree from a Strategy when Ok or otherwise Err when a new value-tree can not be produced for some reason such as in the case of filtering with a predicate which always returns false. You should pass in your strategy as the type parameter.

W

A relative weight of a particular Strategy corresponding to T coupled with T itself. The weight is currently given in u32.

WA

A relative weight of a particular Strategy corresponding to T coupled with Arc<T>. The weight is currently given in u32.