Test That! lets you write test assertions which precisely specify your intent:

let vec = vec![5, 123, -4];
assert_that!(vec, each(gt(0)));

and get informative, meaningful diagnostics when the tests fail:

Value of: vec
Expected: only contains elements that is greater than 0
Actual: [5, 123, -4],
  whose element #2 is -4, which is less than or equal to 0

I've recently published this new crate as a fork of GoogleTest Rust, which I had spearheaded a few years ago while I was at Google. Test That! has a much improved developer experience compared with the original. See my blog post (linked below) for more details.

I'm really keen on getting feedback on this crate. Please give it a try and let me know your experiences!

• Crate: crates.io: Rust Package Registry
• GitHub: GitHub - hovinen/test-that: Test assertion library for Rust based on the crate GoogleTest · GitHub
• Blog post announcement: Blog -- Bradford Hovinen

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