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Mutators.md

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Stryker supports a variety of mutators, which are listed below. Do you have a suggestion for a (new) mutator? Feel free to create an issue!

Arithmetic Operators

Original Mutated
+ -
- +
* /
/ *
% *

Equality Operators

Original Mutated
> <
> >=
>= <
>= >
< >
< <=
<= >
<= <
== !=
!= ==

Logical Operators

Original Mutated
&& ||
|| &&
^ ==

Boolean Literals

Original Mutated
true false
false true
!person.IsAdult() person.IsAdult()
if(person.IsAdult()) if(!person.IsAdult())
while(person.IsAdult()) while(!person.IsAdult())

Assignment Statements

Original Mutated
+= -=
-= +=
*= /=
/= *=
%= *=
<<= >>=
>>= <<=
&= |=
&= ^=
|= &=
|= ^=
^= |=
^= &=

Collection initialization

Original Mutated
new int[] { 1, 2 }; new int[] { };
int[] numbers = { 1, 2 }; int[] numbers = { };
new List<int> { 1, 2 }; new List<int> { };
new Collection<int> { 1, 2 }; new Collection<int> { };
new Dictionary<int, int> { { 1, 1 } }; new Dictionary<int, int> { };

Unary Operators

Original Mutated
-variable +variable
+variable -variable
~variable variable

Update Operators

Original Mutated
variable++ variable--
variable-- variable++
++variable --variable
--variable ++variable

Checked Statements

Original Mutated
checked(2 + 4) 2 + 4

Linq Methods

Original Mutated
SingleOrDefault() Single()
Single() SingleOrDefault()
FirstOrDefault() First()
First() FirstOrDefault()
Last() First()
All() Any()
Any() All()
Skip() Take()
Take() Skip()
SkipWhile() TakeWhile()
TakeWhile() SkipWhile()
Min() Max()
Max() Min()
Sum() Max()*
Count() Sum()
Average() Min()
OrderBy() OrderByDescending()
OrderByDescending() OrderBy()
ThenBy() ThenByDescending()
ThenByDescending() ThenBy()
Reverse() AsEnumerable()
AsEnumerable() Reverse()
Union() Intersect()
Intersect() Union()
Concat() Except()
Except() Concat()

* Sum() was mutated to Count() in previous versions; this change reduces compilation errors.

String Literals and Constants

Original Mutated
"foo" ""
"" "Stryker was here!"
$"foo {bar}" $""
@"foo" @""
string.Empty "Stryker was here!"

Bitwise Operators

Original Mutated
<< >>
>> <<
& |
| &
a^b ~(a^b)

Regular Expressions

For the full list of all available regex mutations, see the regex mutator docs.