dyn-eq 0.1.3

Test equality between trait objects
Documentation 
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// Copyright (c) 2023 Zacharie Dubrulle
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

use core::fmt::Debug;
use dyn_eq::DynEq;

trait MyTrait: DynEq + Debug {}
dyn_eq::eq_trait_object!(MyTrait);

// This works
#[cfg(feature = "alloc")]
#[derive(PartialEq, Eq)]
struct Container {
	field: Box<dyn MyTrait>,
}

#[derive(Debug, PartialEq, Eq)]
struct A {
	value: u32,
}
impl MyTrait for A {}

#[derive(Debug, PartialEq, Eq)]
struct B {
	value: u32,
}
impl MyTrait for B {}

#[cfg(feature = "alloc")]
mod with_box {
	use super::*;

	#[test]
	fn a_and_a_same_value_equal() {
		let a1: Box<dyn MyTrait> = Box::new(A { value: 5 });
		let a2: Box<dyn MyTrait> = Box::new(A { value: 5 });

		assert!(a1 == a2);
	}

	#[test]
	fn a_and_a_different_value_not_equal() {
		let a1: Box<dyn MyTrait> = Box::new(A { value: 5 });
		let a2: Box<dyn MyTrait> = Box::new(A { value: 6 });

		assert!(a1 != a2);
	}

	#[test]
	fn b_and_b_same_value_equal() {
		let b1: Box<dyn MyTrait> = Box::new(B { value: 5 });
		let b2: Box<dyn MyTrait> = Box::new(B { value: 5 });

		assert!(b1 == b2);
	}

	#[test]
	fn b_and_b_different_value_not_equal() {
		let b1: Box<dyn MyTrait> = Box::new(B { value: 5 });
		let b2: Box<dyn MyTrait> = Box::new(B { value: 6 });

		assert!(b1 != b2);
	}

	#[test]
	fn a_and_b_same_value_not_equal() {
		let a: Box<dyn MyTrait> = Box::new(A { value: 5 });
		let b: Box<dyn MyTrait> = Box::new(B { value: 5 });

		assert!(a != b);
	}

	#[test]
	fn a_and_b_different_value_not_equal() {
		let a: Box<dyn MyTrait> = Box::new(A { value: 5 });
		let b: Box<dyn MyTrait> = Box::new(B { value: 6 });

		assert!(a != b);
	}

	#[test]
	fn comparaison_dont_move_box() {
		let a: Box<dyn MyTrait> = Box::new(A { value: 5 });
		let b: Box<dyn MyTrait> = Box::new(B { value: 6 });

		assert!(!(a == b));
		println!("{:?}", b);
	}
}

mod with_ref {
	use super::*;

	#[test]
	fn a_and_a_same_value_equal() {
		let a1: &dyn MyTrait = &A { value: 5 };
		let a2: &dyn MyTrait = &A { value: 5 };

		assert!(a1 == a2);
	}

	#[test]
	fn a_and_a_different_value_not_equal() {
		let a1: &dyn MyTrait = &A { value: 5 };
		let a2: &dyn MyTrait = &A { value: 6 };

		assert!(a1 != a2);
	}

	#[test]
	fn b_and_b_same_value_equal() {
		let b1: &dyn MyTrait = &B { value: 5 };
		let b2: &dyn MyTrait = &B { value: 5 };

		assert!(b1 == b2);
	}

	#[test]
	fn b_and_b_different_value_not_equal() {
		let b1: &dyn MyTrait = &B { value: 5 };
		let b2: &dyn MyTrait = &B { value: 6 };

		assert!(b1 != b2);
	}

	#[test]
	fn a_and_b_same_value_not_equal() {
		let a: &dyn MyTrait = &A { value: 5 };
		let b: &dyn MyTrait = &B { value: 5 };

		assert!(a != b);
	}

	#[test]
	fn a_and_b_different_value_not_equal() {
		let a: &dyn MyTrait = &A { value: 5 };
		let b: &dyn MyTrait = &B { value: 6 };

		assert!(a != b);
	}
}