How to ignore bitwise or with RegexOptions

[AshleighAdams]

Hey, is it possible to ignore bitwise operations on RegexOptions?

I tried adding System.Text.Regex.RegexOptions.op_BitwiseOr to my ignore-methods options, but no dice.

[rouke-broersma]

Hi 👋

The ignore-methods option is used to ignore mutations on method invocations and not operators. You can use the [ExcludeFromCodeCoverageAttribute]. This ignores the scope it is placed on from mutation testing. Does that help you?

[AshleighAdams]

Surely an operator is just syntactic sugar for a method call?

For now, I can work around using [ExcludeFromCodeCoverage] by switching from a private field to a private property, but I still want to mutation test the regex pattern later on, which will break this.

[rouke-broersma]

We do AST (syntax tree) mutations and not bytecode/IL mutations so we see the syntactic sugar unfortunately. Conceptually perhaps it makes sense to allow ignore-methods to work on operators as well, but currently that is not supported. You could create a feature request for this.

[AshleighAdams]

Ah, yeah, I see the trouble then---you won't know the fully qualified function it is syntactic sugar for either, not without a lot of work anyway.

I'll mark the ExcludeFromCodeCoverage solution as the answer then for now.