similar-asserts is a crate that enhances the default assertion experience by using similar for diffing. It supports comparing either Debug or Serialize representations of values. On failed assertions it renders out a colorized diff to the terminal.
fn main() {
let reference = vec![1, 2, 3, 4];
similar_asserts::assert_eq!(reference, (0..4).collect::<Vec<_>>());
}
I really like this tool but I don't want to use it for tests per-se. I want to actually use it for diffs! Can the functionality be exported in such a way that I don't have to get a panic when things fail? Diff could be an exposed, opaque type with the Display impl.
When diffing 2 big objects which have a small difference in the middle, it's very hard to know what exactly gone wrong. I have to either scroll the terminal, or to redirect cargo test to a file and then use less.
So it would be nice to only display the difference, like diff tool does.
If you don't want to have a breaking change, than you can add a dedicated macro assert_eq_diff to display only diff.
I'm noticing that if my data has a serde_json::Value in it and then I compare with this library, the diff it produces contains weird constructors like $serde_json::private::Number. This may not strictly be a bug, but it's surprising.
See https://github.com/colin-kiegel/rust-pretty-assertions for a reference of what this might look like. Note how only the non-matching characters are bolded and the use of background color.
This refactors the code internally so that even non Debug objects can be asserted on. This is not super useful for assert_eq! though it does help with error objects quite a bit.
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![[feature request] Highlights for character-level diffing](https://avatars.githubusercontent.com/u/840985?v=4)
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