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Add LINQ Append/Prepend mutation #3199

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Add LINQ Append/Prepend mutation #3199

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4 changes: 3 additions & 1 deletion src/Stryker.Abstractions/LinqExpression.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,5 +38,7 @@ public enum LinqExpression
OrderDescending,
SkipLast,
TakeLast,
UnionBy
UnionBy,
Append,
Prepend
}
4 changes: 3 additions & 1 deletion src/Stryker.Core/Stryker.Core.UnitTest/Mutators/LinqMutatorTest.cs
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Expand Up @@ -16,7 +16,7 @@ public class LinqMutatorTest : TestBase
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
private ExpressionSyntax GenerateExpressions(string expression)
private static MemberAccessExpressionSyntax GenerateExpressions(string expression)
{
var tree = CSharpSyntaxTree.ParseText($@"
using System;
Expand Down Expand Up @@ -91,6 +91,8 @@ public void ShouldBeMutationLevelStandard()
[DataRow(LinqExpression.OrderDescending, LinqExpression.Order)]
[DataRow(LinqExpression.UnionBy, LinqExpression.IntersectBy)]
[DataRow(LinqExpression.IntersectBy, LinqExpression.UnionBy)]
[DataRow(LinqExpression.Append, LinqExpression.Prepend)]
[DataRow(LinqExpression.Prepend, LinqExpression.Append)]
public void ShouldMutate(LinqExpression original, LinqExpression expected)
{
var target = new LinqMutator();
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8 changes: 6 additions & 2 deletions src/Stryker.Core/Stryker.Core/Mutators/LinqMutator.cs
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Expand Up @@ -55,7 +55,9 @@ static LinqMutator()
{ LinqExpression.Order, LinqExpression.OrderDescending },
{ LinqExpression.OrderDescending, LinqExpression.Order },
{ LinqExpression.UnionBy, LinqExpression.IntersectBy },
{ LinqExpression.IntersectBy, LinqExpression.UnionBy }
{ LinqExpression.IntersectBy, LinqExpression.UnionBy },
{ LinqExpression.Append, LinqExpression.Prepend },
{ LinqExpression.Prepend, LinqExpression.Append }
};
RequireArguments = new HashSet<LinqExpression>
{
Expand All @@ -73,7 +75,9 @@ static LinqMutator()
LinqExpression.MaxBy,
LinqExpression.MinBy,
LinqExpression.IntersectBy,
LinqExpression.UnionBy
LinqExpression.UnionBy,
LinqExpression.Append,
LinqExpression.Prepend
};
}
/// <summary> Apply mutations to an <see cref="InvocationExpressionSyntax"/> </summary>
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