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docs: Add new Stryker.NET mutations #3679

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Mar 28, 2025
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docs: Add new Stryker.NET mutations #3679

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Add new Stryker.NET mutations
martincostello Mar 14, 2025
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martincostello Mar 14, 2025
83d08a1
Revert left shift right shift negation change
rouke-broersma Mar 28, 2025
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31 changes: 19 additions & 12 deletions docs/supported-mutators.md
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Expand Up @@ -49,20 +49,25 @@ All Stryker versions support a variety of different mutators. We've aligned on a

## Assignment Expression

| Mutant operator | Original | Mutated |
| --------------------------------------------- | -------------------- | -------------------- |
| AdditionAssignmentNegation | `+=` | `-=` |
| SubtractionAssignmentNegation | `-=` | `+=` |
| MultiplicationAssignmentNegation | `*=` | `/=` |
| DivisionAssignmentNegation | `/=` | `*=` |
| RemainderAssignmentToMultiplicationAssignment | `%=` | `*=` |
| LeftShiftAssignmentNegation | `<<=` | `>>=` |
| RightShiftAssignmentNegation | `>>=` | `<<=` |
| BitwiseAndAssignmentNegation | `&=` | <code>&#124;=</code> |
| BitwiseOrAssignmentNegation | <code>&#124;=</code> | `&=` |
| NullCoalescingAssignmentToAndAssignment | `??=` | `&&=`¹ |
| Mutant operator | Original | Mutated |
| -------------------------------------------------- | -------------------- | -------------------- |
| AdditionAssignmentNegation | `+=` | `-=` |
| SubtractionAssignmentNegation | `-=` | `+=` |
| MultiplicationAssignmentNegation | `*=` | `/=` |
| DivisionAssignmentNegation | `/=` | `*=` |
| RemainderAssignmentToMultiplicationAssignment | `%=` | `*=` |
| LeftShiftAssignmentNegation | `<<=` | `>>=` |
| RightShiftAssignmentNegation | `>>=` | `<<=` |
| LeftShiftAssignmentToUnsignedRightShiftAssignment | `<<=` | `>>>=`² |
| RightShiftAssignmentToUnsignedRightShiftAssignment | `>>=` | `>>>=`² |
| UnsignedRightShiftAssignmentToLeftShiftAssignment | `>>>=` | `<<=`² |
| UnsignedRightShiftAssignmentToRightShiftAssignment | `>>>=` | `>>=`² |
| BitwiseAndAssignmentNegation | `&=` | <code>&#124;=</code> |
| BitwiseOrAssignmentNegation | <code>&#124;=</code> | `&=` |
| NullCoalescingAssignmentToAndAssignment | `??=` | `&&=`¹ |

- ¹: Only supported by Stryker-JS
- ²: Only supported by Stryker.NET

[🔝 Back to Top](#)

Expand Down Expand Up @@ -204,6 +209,8 @@ Due to differences in language syntax, method expressions are implemented differ
| MaxToMin | `Max()` | `Min()` |
| SumToCount | `Sum()` | `Count()` |
| CountToSum | `Count()` | `Sum()` |
| AppendToPrepend | `Append()` | `Prepend()` |
| PrependToAppend | `Prepend()` | `Append()` |

### Stryker4s

Expand Down