proptest::strategy

Struct Union

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pub struct Union<T: Strategy> { /* private fields */ }
Expand description

A Strategy which picks from one of several delegate Stragegys.

See Strategy::prop_union().

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impl<T: Strategy> Union<T>

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pub fn new(options: impl IntoIterator<Item = T>) -> Self

Create a strategy which selects uniformly from the given delegate strategies.

When shrinking, after maximal simplification of the chosen element, the strategy will move to earlier options and continue simplification with those.

§Panics

Panics if options is empty.

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pub fn new_weighted(options: Vec<W<T>>) -> Self

Create a strategy which selects from the given delegate strategies.

Each strategy is assigned a non-zero weight which determines how frequently that strategy is chosen. For example, a strategy with a weight of 2 will be chosen twice as frequently as one with a weight of 1.

§Panics

Panics if options is empty or any element has a weight of 0.

Panics if the sum of the weights overflows a u32.

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pub fn or(self, other: T) -> Self

Add other as an additional alternate strategy with weight 1.

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impl<T: Clone + Strategy> Clone for Union<T>

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fn clone(&self) -> Union<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug + Strategy> Debug for Union<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: Strategy> Strategy for Union<T>

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type Tree = UnionValueTree<T>

The value tree generated by this Strategy.
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type Value = <T as Strategy>::Value

The type of value used by functions under test generated by this Strategy. Read more
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fn new_tree(&self, runner: &mut TestRunner) -> NewTree<Self>

Generate a new value tree from the given runner. Read more
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fn prop_map<O: Debug, F: Fn(Self::Value) -> O>(self, fun: F) -> Map<Self, F>
where Self: Sized,

Returns a strategy which produces values transformed by the function fun. Read more
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fn prop_map_into<O: Debug>(self) -> MapInto<Self, O>
where Self: Sized, Self::Value: Into<O>,

Returns a strategy which produces values of type O by transforming Self with Into<O>. Read more
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fn prop_perturb<O: Debug, F: Fn(Self::Value, TestRng) -> O>( self, fun: F, ) -> Perturb<Self, F>
where Self: Sized,

Returns a strategy which produces values transformed by the function fun, which is additionally given a random number generator. Read more
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fn prop_flat_map<S: Strategy, F: Fn(Self::Value) -> S>( self, fun: F, ) -> Flatten<Map<Self, F>>
where Self: Sized,

Maps values produced by this strategy into new strategies and picks values from those strategies. Read more
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fn prop_ind_flat_map<S: Strategy, F: Fn(Self::Value) -> S>( self, fun: F, ) -> IndFlatten<Map<Self, F>>
where Self: Sized,

Maps values produced by this strategy into new strategies and picks values from those strategies while considering the new strategies to be independent. Read more
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fn prop_ind_flat_map2<S: Strategy, F: Fn(Self::Value) -> S>( self, fun: F, ) -> IndFlattenMap<Self, F>
where Self: Sized,

Similar to prop_ind_flat_map(), but produces 2-tuples with the input generated from self in slot 0 and the derived strategy in slot 1. Read more
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fn prop_filter<R: Into<Reason>, F: Fn(&Self::Value) -> bool>( self, whence: R, fun: F, ) -> Filter<Self, F>
where Self: Sized,

Returns a strategy which only produces values accepted by fun. Read more
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fn prop_filter_map<F: Fn(Self::Value) -> Option<O>, O: Debug>( self, whence: impl Into<Reason>, fun: F, ) -> FilterMap<Self, F>
where Self: Sized,

Returns a strategy which only produces transformed values where fun returns Some(value) and rejects those where fun returns None. Read more
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fn prop_union(self, other: Self) -> Union<Self>
where Self: Sized,

Returns a strategy which picks uniformly from self and other. Read more
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fn prop_recursive<R: Strategy<Value = Self::Value> + 'static, F: Fn(BoxedStrategy<Self::Value>) -> R>( self, depth: u32, desired_size: u32, expected_branch_size: u32, recurse: F, ) -> Recursive<Self::Value, F>
where Self: Sized + 'static,

Generate a recursive structure with self items as leaves. Read more
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fn prop_shuffle(self) -> Shuffle<Self>
where Self: Sized, Self::Value: Shuffleable,

Shuffle the contents of the values produced by this strategy. Read more
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fn boxed(self) -> BoxedStrategy<Self::Value>
where Self: Sized + 'static,

Erases the type of this Strategy so it can be passed around as a simple trait object. Read more
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fn sboxed(self) -> SBoxedStrategy<Self::Value>
where Self: Sized + Send + Sync + 'static,

Erases the type of this Strategy so it can be passed around as a simple trait object. Read more
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fn no_shrink(self) -> NoShrink<Self>
where Self: Sized,

Wraps this strategy to prevent values from being subject to shrinking. Read more

Auto Trait Implementations§

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impl<T> Freeze for Union<T>

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impl<T> RefUnwindSafe for Union<T>
where T: RefUnwindSafe,

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impl<T> Send for Union<T>
where T: Sync + Send,

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impl<T> Sync for Union<T>
where T: Sync + Send,

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impl<T> Unpin for Union<T>

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impl<T> UnwindSafe for Union<T>
where T: RefUnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V