Struct TestRng

pub struct TestRng(/* private fields */);

A fast RNG used solely for testing and benchmarking, not for any real world purposes.

Implementations

impl TestRng

pub fn fixed(seed: u64) -> TestRng

pub fn from_seed(seed: u64) -> TestRng

pub fn next_string(&mut self, max_bytes: u32, is_fixed_size: bool) -> String

Returns a randomly-sampled String, given the maximum size in bytes and an RNG.

Some of the snarkVM internal tests involve the random generation of strings, which are parsed and tested against the original ones. However, since the string parser rejects certain characters, if those characters are randomly generated, the tests fail.

To prevent these failures, as we randomly generate the characters, we ensure that they are not among the ones rejected by the parser; if they are, we adjust them to be allowed characters.

Note that the randomness of the characters is strictly for testing purposes; also note that the disallowed characters are a small fraction of the total set of characters, and thus the adjustments rarely occur.

Trait Implementations

impl Default for TestRng

fn default() -> TestRng

Returns the “default value” for a type.

impl RngCore for TestRng

fn next_u32(&mut self) -> u32

Return the next random u32.

fn next_u64(&mut self) -> u64

Return the next random u64.

fn fill_bytes(&mut self, dest: &mut [u8])

Fill dest with random data.

fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>

Fill dest entirely with random data.

impl CryptoRng for TestRng