Maybe Assertion Patterns

Maybe<T> assertions keep optional-value behavior explicit in tests.

Some Assertions

[Fact]
public void FindUser_ExistingUser_ReturnsSome()
{
    var maybe = FindUser("john@example.com");

    maybe.ShouldBe()
        .Some()
        .Where(user => user.Email == "john@example.com");
}

None Assertions

[Fact]
public void FindUser_UnknownUser_ReturnsNone()
{
    var maybe = FindUser("missing@example.com");

    maybe.ShouldBe().None();
}

Pattern Tips

• Use Some().Where(...) when validating projected fields.
• Use None() for absence without leaking implementation details.
• Pair with Result assertions when converting optional values to failures.

See Also

• Result Assertion Patterns
• Maybe