Provide assertions for IEquatable<T> #2972
Description
I have structs that implement multiple IEquatable<T> but there are no assertions that take advantage of this.
Example:
public readonly struct Wrapper
: IEquatable<Wrapper>,
IEquatable<long>
{
public long Value { get; init; }
public override bool Equals(object? obj)
=> obj is Wrapper other && Equals(other)
|| obj is long value && Equals(value);
public bool Equals(Wrapper other)
=> Value == other.Value;
public static bool operator ==(Wrapper left, Wrapper right) => left.Equals(right);
public static bool operator !=(Wrapper left, Wrapper right) => !left.Equals(right);
public bool Equals(long other)
=> Value == other;
public static bool operator ==(Wrapper left, long right) => left.Equals(right);
public static bool operator !=(Wrapper left, long right) => !left.Equals(right);
public static bool operator ==(long left, Wrapper right) => left.Equals(right);
public static bool operator !=(long left, Wrapper right) => !left.Equals(right);
}Ideally I should be able to write the assertions like:
Wrapper value = new() { Value = 1 };
await Assert.That(value).IsEqualTo(1L);but currently I need to be explicit
Wrapper wrapper = new() { Value = 1 };
await Assert.That(wrapper.Value).IsEqualTo(1);I would imagine the API would look something like this:
public static InvokableValueAssertionBuilder<TActual, TExpected> IsEqualTo<TActual, TExpected>
(
this IValueSource<TActual> valueSource,
TExpected expected,
[CallerArgumentExpression(nameof(expected))] string doNotPopulateThisValue1 = null!
)
where TActual : IEquatable<TExpected>
{
return valueSource.RegisterAssertion(new EqualsExpectedValueAssertCondition<TActual, TExpected>(expected), [doNotPopulateThisValue1]);
}