| commit | a104e3f62eb490d05376de0ed020b89007d11bab | [log] [tgz] |
|---|---|---|
| author | Android Build Coastguard Worker <[email protected]> | Tue May 10 07:04:13 2022 +0000 |
| committer | Android Build Coastguard Worker <[email protected]> | Tue May 10 07:04:13 2022 +0000 |
| tree | 252a378bfaad1976f5f9ecf366574d7e62e75985 | |
| parent | 5cfc303e713cca1503bdff268f126fe96311ddba [diff] | |
| parent | bfdb5445fef5c573fd123d15b36af1b5c24eacce [diff] |
Snap for 8564071 from bfdb5445fef5c573fd123d15b36af1b5c24eacce to mainline-adbd-release Change-Id: I030ad112f013739d14288e8b35aac12900b0c69f
The Arbitrary crate lets you construct arbitrary instances of a type.
This crate is primarily intended to be combined with a fuzzer like libFuzzer and cargo-fuzz or AFL, and to help you turn the raw, untyped byte buffers that they produce into well-typed, valid, structured values. This allows you to combine structure-aware test case generation with coverage-guided, mutation-based fuzzers.
Read the API documentation on docs.rs!
Say you're writing a color conversion library, and you have an Rgb struct to represent RGB colors. You might want to implement Arbitrary for Rgb so that you could take arbitrary Rgb instances in a test function that asserts some property (for example, asserting that RGB converted to HSL and converted back to RGB always ends up exactly where we started).
ArbitraryAutomatically deriving the Arbitrary trait is the recommended way to implement Arbitrary for your types.
Automatically deriving Arbitrary requires you to enable the "derive" cargo feature:
# Cargo.toml [dependencies] arbitrary = { version = "1", features = ["derive"] }
And then you can simply add #[derive(Arbitrary)] annotations to your types:
// rgb.rs use arbitrary::Arbitrary; #[derive(Arbitrary)] pub struct Rgb { pub r: u8, pub g: u8, pub b: u8, }
Arbitrary By HandAlternatively, you can write an Arbitrary implementation by hand:
// rgb.rs use arbitrary::{Arbitrary, Result, Unstructured}; #[derive(Copy, Clone, Debug)] pub struct Rgb { pub r: u8, pub g: u8, pub b: u8, } impl<'a> Arbitrary<'a> for Rgb { fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> { let r = u8::arbitrary(u)?; let g = u8::arbitrary(u)?; let b = u8::arbitrary(u)?; Ok(Rgb { r, g, b }) } }
Licensed under dual MIT or Apache-2.0 at your choice.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this project by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.