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/ : i # Pretty Assertions L When writing tests in Rust, you'll probably use `assert_eq!(a, b)` _a lot_. O l F If such a test fails, it will present all the details of `a` and `b`. pI T But you have to spot the differences yourself, which is not always straightforward, W like here:  : Wouldn't that task be _much_ easier with a colorful diff? =  B Yep — and you only need **one line of code** to make it happen: E ```rust / use pretty_assertions::{assert_eq, assert_ne}; 2 ```
B Show the example behind the screenshots above.
E ```rust,should_panic > // 1. add the `pretty_assertions` dependency to `Cargo.toml`. A < // 2. insert this line at the top of each module, as needed ? 2 #[derive(Debug, PartialEq)]
struct Foo { lorem: &'static str, ipsum: u32, # dolor: Result, & }
U let x = Some(Foo { lorem: "Hello World!", ipsum: 42, dolor: Ok("hey".to_string())});
X Y let y = Some(Foo { lorem: "Hello Wrold!", ipsum: 42, dolor: Ok("hey ho!".to_string())});
\ assert_eq!(x, y); ## Tip
q Specify it as [`[dev-dependencies]`](http://doc.crates.io/specifying-dependencies.html#development-dependencies) t H and it will only be used for compiling tests, examples, and benchmarks.
K > This way the compile time of `cargo build` won't be affected!
A = Also add `#[cfg(test)]` to your `use` statements, like this: @
#[cfg(test)] 2 ## Note 1 * Since `Rust 2018` edition, you need to declare 4 ? `use pretty_assertions::{assert_eq, assert_ne};` per module. B I Before you would write `#[macro_use] extern crate pretty_assertions;`. L N * The replacement is only effective in your own crate, not in other libraries Q you include. O * `assert_ne` is also switched to multi-line presentation, but does _not_ show R
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. C C ( A comparison of two values. W Where both values implement `Debug`, the comparison can be displayed as a pretty diff. Z # use pretty_assertions::Comparison; & + print!("{}", Comparison::new(&123, &134)); . U The values may have different types, although in practice they are usually the same. X
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7 5 6 7 M M 8 M M M 4 Q7 R7 S7 Q7 R7MM M2JM2JMJM3JM3JM3J Ҡ᷷ S74 4 4 8 5 # L Asserts that two expressions are equal to each other (using [`PartialEq`]). O P On panic, this macro will print a diff derived from [`Debug`] representation of S each value. 7 This is a drop in replacement for [`std::assert_eq!`]. : 3 You can provide a custom panic message if desired. 6 ! # Examples ! ! ! " use pretty_assertions::assert_eq; !% ! let a = 3; ! let b = 1 + 2; " assert_eq!(a, b); " " B assert_eq!(a, b, "we are testing addition with {} and {}", a, b); "E " # U # # + # #
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* * + + [ + + [ + + / P Asserts that two expressions are not equal to each other (using [`PartialEq`]). +S , I On panic, this macro will print the values of the expressions with their ,L [`Debug`] representations. , - 7 This is a drop in replacement for [`std::assert_ne!`]. -: R -6 . R . . . " use pretty_assertions::assert_ne; .% . S . let b = 2; . assert_ne!(a, b); . / B assert_ne!(a, b, "we are testing that the values are not equal"); /E / / m / / ? 0 0 0
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