Struct diem_proptest_helpers::ValueGenerator

pub struct ValueGenerator { /* fields omitted */ }

Context for generating single values out of strategies.

Proptest is designed to be built around “value trees”, which represent a spectrum from complex values to simpler ones. But in some contexts, like benchmarking or generating corpuses, one just wants a single value. This is a convenience struct for that.

Implementations

impl ValueGenerator

pub fn new() -> Self

Creates a new value generator with the default RNG.

pub fn new_with_rng(rng: TestRng) -> Self

Creates a new value generator with provided RNG

pub fn deterministic() -> Self

Creates a new value generator with a deterministic RNG.

This generator has a hardcoded seed, so its results are predictable across test runs. However, a new proptest version may change the seed.

pub fn generate<S: Strategy>(&mut self, strategy: S) -> S::Value

Generates a single value for this strategy.

Panics if generating the new value fails. The only situation in which this can happen is if generating the value causes too many internal rejects.

Trait Implementations

impl Default for ValueGenerator

fn default() -> ValueGenerator

Returns the “default value” for a type.