Arithmetic assertions
Arithmetic assertions are those that compare two values together.
Equality
These assertions compare values that implement the PartialEq trait:
// Ensure that the values are equal
assert_eq!(x, y);
// Ensure that the values are inequal
assert_ne!(x, y);
Ordering
These assertions compare values that implement the PartialOrd trait:
// Ensure that x is less than y
assert_lt!(x, y);
// Ensure that x is less than or equal to y
assert_le!(x, y);
// Ensure that x is greater than y
assert_gt!(x, y);
// Ensure that x is greater than or equal to y
assert_ge!(x, y);
Details (advanced)
The two values do not have to be of the same type. If the first value is of type T and the second of type U, then the following traits must be implemented:
// for the equality assertions to work
impl PartialEq<U> for T { ... }
// for the order assertions to work
impl PartialOrd<U> for T { ... }
Both types, additionally, must implement the Debug trait.
| Assertion | Panic condition |
|---|---|
assert_eq |
!x.eq(y) |
assert_ne |
!x.ne(y) |
assert_lt |
!x.lt(y) |
assert_le |
!x.le(y) |
assert_gt |
!x.gt(y) |
assert_ge |
!x.ge(y) |