Stainless is a lightweight, flexible, unopinionated testing framework.

describe! stainless {
    before_each {
        // Start up a test.
        let mut stainless = true;
    }

    it "makes organizing tests easy" {
        // Do the test.
        assert!(stainless);
    }

    after_each {
        // End the test.
        stainless = false;
    }

    bench "something simple" (bencher) {
        bencher.iter(|| 2 * 2)
    }

    describe! nesting {
        it "makes it simple to categorize tests" {
            // It even generates submodules!
            assert_eq!(2, 2);
        }
    }
}

Expands to (roughly):

mod stainless {
    #[test]
    fn makes_organizing_tests_easy() {
        let mut stainless = true;
        assert!(stainless);
        stainless = false;
    }

    #[bench]
    fn something_simple(bencher: &mut test::Bencher) {
        bencher.iter(|| 2 * 2)
    }

    mod nesting {
        #[test]
        fn makes_it_simple_to_categorize_tests() {
            assert_eq!(2, 2);
        }
    }
}

Stainless exports the describe! syntax extension, which allows you to quickly generate complex testing hierarchies and reduce boilerplate through before_each and after_each.

Stainless currently supports 4 types of subblocks:

• before_each and after_each,
• it and failing
• bench
• nested describe!

before_each and after_each allow you to group common initialization and teardown for a group of tests into a single block, shortening your tests.

it generates tests which use before_each and after_each. failing does the same, except the generated tests are marked with #[should_panic].

bench allows you to generate benchmarks in the same fashion, though before_each and after_each blocks do not affect bench blocks.

Nested describe! blocks allow you to better organize your tests into small units and gives you granular control over where before_each and after_each apply.

Together, these 4 types of subblocks give you more flexibility and control than the built in testing infrastructure.

MIT