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Why is "a"+"b" mutated to "a"-"b" and compiles?

See original GitHub issue

How comes that the mutation report has lines like this: [Survived] Binary expression mutation on line 26: '"" + toString(x)' ==> '"" - toString(x)'

Mutating "a"+"b" to "a"-"b" is not valid C# code if I am not totally wrong? So why is this a valid mutation that even passes the execution of my tests?

Issue Analytics

State:
Created 5 years ago
Comments:15 (8 by maintainers)

Top GitHub Comments

1reaction

richardwerkmancommented, Jan 27, 2019

@cs-util Did you by any chance already figure this out yourself? I now get the same output as you did: [Survived] Binary expression mutation on line 26: '"" + toString(x)' ==> '"" - toString(x)' But this is because of a wrong implementation of the fix I did. I’ll create a pull request hoping to fix your issue. If you could test this that would be great!

1reaction

richardwerkmancommented, Jan 12, 2019

Thanks for looking into this further! I was not aware that the target projects “target framework” had this impact. I assumed Stryker would be backwards compatible since .net also is.

Your suggestion to kill Stryker when a not supported target framework is found would not have my preference. I think Stryker should support netcoreapp1.1 and up. Also netstandard2.0 should be supported. We could start by creating an integration test for each target framework we want to support. All should give the same output. If this is not the case we should fix this.

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