proptest::array

Struct UniformArrayStrategy

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pub struct UniformArrayStrategy<S, T> { /* private fields */ }
Expand description

A Strategy which generates fixed-size arrays containing values drawn from an inner strategy.

T must be an array type of length 1 to 32 whose values are produced by strategy S. Instances of this type are normally created by the various uniformXX functions in this module.

This is mainly useful when the inner strategy is not Copy, precluding expressing the strategy as [myStrategy; 32], for example.

§Example

use proptest::prelude::*;

proptest! {
  #[test]
  fn test_something(a in prop::array::uniform32(1u32..)) {
    let unexpected = [0u32;32];
    // `a` is also a [u32;32], so we can compare them directly
    assert_ne!(unexpected, a);
  }
}

Implementations§

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impl<S, T> UniformArrayStrategy<S, T>

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pub fn new(strategy: S) -> Self

Directly create a UniformArrayStrategy.

This is only intended for advanced use, since the only way to specify the array size is with the turbofish operator and explicitly naming the type of the values in the array and the strategy itself.

Prefer the uniformXX functions at module-level unless something precludes their use.

Trait Implementations§

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impl<S: Clone, T: Clone> Clone for UniformArrayStrategy<S, T>

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fn clone(&self) -> UniformArrayStrategy<S, 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<S: Debug, T: Debug> Debug for UniformArrayStrategy<S, 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<S: Strategy, const N: usize> Strategy for UniformArrayStrategy<S, [S::Value; N]>

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type Tree = ArrayValueTree<[<S as Strategy>::Tree; N]>

The value tree generated by this Strategy.
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type Value = [<S as Strategy>::Value; N]

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 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 no_shrink(self) -> NoShrink<Self>
where Self: Sized,

Wraps this strategy to prevent values from being subject to shrinking. Read more
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impl<S: Copy, T: Copy> Copy for UniformArrayStrategy<S, T>

Auto Trait Implementations§

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impl<S, T> Freeze for UniformArrayStrategy<S, T>
where S: Freeze,

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impl<S, T> RefUnwindSafe for UniformArrayStrategy<S, T>

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impl<S, T> Send for UniformArrayStrategy<S, T>
where S: Send, T: Send,

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impl<S, T> Sync for UniformArrayStrategy<S, T>
where S: Sync, T: Sync,

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impl<S, T> Unpin for UniformArrayStrategy<S, T>
where S: Unpin, T: Unpin,

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impl<S, T> UnwindSafe for UniformArrayStrategy<S, T>
where S: UnwindSafe, T: UnwindSafe,

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 T)

🔬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