Compare Tuples in Rust

I’m writing a test case for a function which returns a tuple including an enum. I want to verify that the returned tuple matches what I am expecting.

How I do compare tuples composed of enums in Rust? The following fails to compile:

enum Test {
  Foo,
  Bar
}
assert_eq!((1, Test::Foo), (1, Test::Foo));

(Of course, one of those tuples is generated at runtime by a method.)

>Solution :

Tuples already implement PartialEq and Debug if all their elements do, but you’re missing both a Debug and PartialEq implementation for your custom enum:

#[derive(Debug, PartialEq)]
enum Test {
  Foo,
  Bar
}

With that your expected assert_eq!((1, Test::Foo), (1, Test::Foo)); works.

If you can’t implement either trait you can use matches!(<value>, <pattern>):

let got = (1, Test::Foo); // calculate your result
assert!(matches!(got, (1, Test::Foo)))