#type #generic #parameters #macro #test

macro typed_test_gen

Macros to help generate tests from functions with a generic type parameter

1 unstable release

0.1.0 Sep 1, 2023

#204 in #parameters

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Used in twibint

GPL-3.0-only

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test_gen

Rust crate for defining a macro that automatically specializes generic tests on provided types. This is useful when we want to write identical tests with different underlying types. This crate provide the syntax #[test_with(Type1, Type2)] which will instantiate 2 tests: one on Type1, the other on Type2. Those types could be any path to any generic type like module::something::Type<Gen>.

An example is better than words:

#[test_with(u32, u64, char)]
fn test_vec<T>() {
    let vec = Vec::<T>::with_capacity(10);
    assert_eq!(vec.len(), 0);
    assert!(vec.capacity() >= 10);
}

This code will generate 3 tests function: _specialized__test_vec__u32_, _specialized__test_vec__u64_, and _specialized__test_vec__char_.

This support adding the attribute #[should_panic] to the definition.

#[test_with(u32, u64, char)]
#[should_panic]
fn test_vec_fail<T>() {
    let vec = Vec::<T>::with_capacity(10);
    assert_eq!(vec.len(), 0);
    assert!(vec.capacity() < 10);
}

Dependencies

~295–750KB
~18K SLoC