Background and motivation

Sometimes you want to ensure a particular exception is thrown, but where the message does not contain a particular wildcard phrase.

API Proposal

Affects ExceptionAssertions and ExceptionAssertionsExtensions

API Usage

Instead of

act.Should().Throw<XunitException>().WithMessage("*existingProperty*wrongvalue*")
            .Which.Message.Should().NotContain("missingProperty");

it would allow

act.Should().Throw<XunitException>()
      .WithMessage("*existingProperty*wrongvalue*")
      .WithoutMessage("*missingProperty*");

Alternative Designs

No response

Risks

No response

Are you willing to help with a proof-of-concept (as PR in that or a separate repo) first and as pull-request later on?

No