Add test: AddParameters_NoLastWhitespaceTrivia

[Youssef1313]

Expecting this test to fail in debug due to an assertion failure deep in the compiler layer. The root cause here is that the given ConstructorDeclarationSyntax doesn't have a whitespace leading trivia. Causing the value of lastWhiteSpaceTrivia to remain the default literal:

roslyn/src/Features/Core/Portable/ChangeSignature/AbstractChangeSignatureService.cs

Line 937 in 89d820c

SyntaxTrivia lastWhiteSpaceTrivia = default;

When it's passed to SyntaxGenerator.DocumentationCommentTrivia:

roslyn/src/Features/Core/Portable/ChangeSignature/AbstractChangeSignatureService.cs

Lines 999 to 1003 in 89d820c

	var extraDocComments = Generator.DocumentationCommentTrivia(
	extraNodeList,
	node.GetTrailingTrivia(),
	lastWhiteSpaceTrivia,
	document.Project.Solution.Options.GetOption(FormattingOptions.NewLine, document.Project.Language));

The following assertion fails:

roslyn/src/Compilers/Core/Portable/Syntax/SyntaxTrivia.cs

Line 63 in bc98ed9

Debug.Assert(node is object);

Will see what also happens in Release.

[Youssef1313]

This causes a NRE on Release. I'll get that fixed in #53052

StackTrace for reference:

  Failed Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.ChangeSignature.ChangeSignatureTests.AddParameters_NoLastWhitespaceTrivia [15 ms]
  Error Message:
   System.NullReferenceException : Object reference not set to an instance of an object.
  Stack Trace:
     at Microsoft.CodeAnalysis.GreenNode.AdjustFlagsAndWidth(GreenNode node) in /_/src/Compilers/Core/Portable/Syntax/GreenNode.cs:line 109
   at Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxList.WithTwoChildren..ctor(GreenNode child0, GreenNode child1) in /_/src/Compilers/Core/Portable/Syntax/InternalSyntax/SyntaxList.WithTwoChildren.cs:line 28
   at Microsoft.CodeAnalysis.Syntax.InternalSyntax.SyntaxList.List(GreenNode child0, GreenNode child1) in /_/src/Compilers/Core/Portable/Syntax/InternalSyntax/SyntaxList.cs:line 42
   at Microsoft.CodeAnalysis.GreenNode.CreateList[TFrom](IReadOnlyList`1 list, Func`2 select) in /_/src/Compilers/Core/Portable/Syntax/GreenNode.cs:line 954
   at Microsoft.CodeAnalysis.GreenNode.CreateList[TFrom](IEnumerable`1 enumerable, Func`2 select) in /_/src/Compilers/Core/Portable/Syntax/GreenNode.cs:line 919
   at Microsoft.CodeAnalysis.SyntaxToken.WithTrailingTrivia(IEnumerable`1 trivia) in /_/src/Compilers/Core/Portable/Syntax/SyntaxToken.cs:line 507
   at Microsoft.CodeAnalysis.SyntaxNodeExtensions.WithTrailingTrivia[TSyntax](TSyntax node, IEnumerable`1 trivia) in /_/src/Compilers/Core/Portable/Syntax/SyntaxNodeExtensions.cs:line 406
   at Microsoft.CodeAnalysis.CSharp.CodeGeneration.CSharpSyntaxGenerator.DocumentationCommentTrivia(IEnumerable`1 nodes, SyntaxTriviaList trailingTrivia, SyntaxTrivia lastWhitespaceTrivia, String endOfLineString) in /_/src/Workspaces/CSharp/Portable/CodeGeneration/CSharpSyntaxGenerator.cs:line 85
   at Microsoft.CodeAnalysis.ChangeSignature.AbstractChangeSignatureService.GetPermutedDocCommentTrivia(Document document, SyntaxNode node, ImmutableArray`1 permutedParamNodes) in /_/src/Features/Core/Portable/ChangeSignature/AbstractChangeSignatureService.cs:line 999
   at Microsoft.CodeAnalysis.CSharp.ChangeSignature.CSharpChangeSignatureService.UpdateParamTagsInLeadingTrivia(Document document, CSharpSyntaxNode node, ISymbol declarationSymbol, SignatureChange updatedSignature) in /_/src/Features/CSharp/Portable/ChangeSignature/CSharpChangeSignatureService.cs:line 745
   at Microsoft.CodeAnalysis.CSharp.ChangeSignature.CSharpChangeSignatureService.<ChangeSignatureAsync>d__15.MoveNext() in /_/src/Features/CSharp/Portable/ChangeSignature/CSharpChangeSignatureService.cs:line 267
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Roslyn.Utilities.TaskExtensions.WaitAndGetResult_CanCallOnBackground[T](Task`1 task, CancellationToken cancellationToken) in /_/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Utilities/TaskExtensions.cs:line 56
   at Microsoft.CodeAnalysis.ChangeSignature.AbstractChangeSignatureService.<>c__DisplayClass20_1.<CreateUpdatedSolutionAsync>b__1(SyntaxNode originalNode, SyntaxNode potentiallyUpdatedNode) in /_/src/Features/Core/Portable/ChangeSignature/AbstractChangeSignatureService.cs:line 378
   at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.Replacer`1.Visit(SyntaxNode node) in /_/src/Compilers/CSharp/Portable/Syntax/SyntaxReplacer.cs:line 193
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitListElement[TNode](TNode node) in /_/src/Compilers/CSharp/Portable/Syntax/CSharpSyntaxRewriter.cs:line 168
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitList[TNode](SyntaxList`1 list) in /_/src/Compilers/CSharp/Portable/Syntax/CSharpSyntaxRewriter.cs:line 145
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitClassDeclaration(ClassDeclarationSyntax node) in /_/src/Compilers/CSharp/Portable/CSharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Main.Generated.cs:line 1873
   at Microsoft.CodeAnalysis.CSharp.Syntax.ClassDeclarationSyntax.Accept[TResult](CSharpSyntaxVisitor`1 visitor) in /_/src/Compilers/CSharp/Portable/CSharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Syntax.Generated.cs:line 9773
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(SyntaxNode node) in /_/src/Compilers/CSharp/Portable/Syntax/CSharpSyntaxRewriter.cs:line 41
   at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.Replacer`1.Visit(SyntaxNode node) in /_/src/Compilers/CSharp/Portable/Syntax/SyntaxReplacer.cs:line 184
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitListElement[TNode](TNode node) in /_/src/Compilers/CSharp/Portable/Syntax/CSharpSyntaxRewriter.cs:line 168
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitList[TNode](SyntaxList`1 list) in /_/src/Compilers/CSharp/Portable/Syntax/CSharpSyntaxRewriter.cs:line 145
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitCompilationUnit(CompilationUnitSyntax node) in /_/src/Compilers/CSharp/Portable/CSharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Main.Generated.cs:line 1837
   at Microsoft.CodeAnalysis.CSharp.Syntax.CompilationUnitSyntax.Accept[TResult](CSharpSyntaxVisitor`1 visitor) in /_/src/Compilers/CSharp/Portable/CSharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Syntax.Generated.cs:line 8853
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(SyntaxNode node) in /_/src/Compilers/CSharp/Portable/Syntax/CSharpSyntaxRewriter.cs:line 41
   at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.Replacer`1.Visit(SyntaxNode node) in /_/src/Compilers/CSharp/Portable/Syntax/SyntaxReplacer.cs:line 184
   at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.Replace[TNode](SyntaxNode root, IEnumerable`1 nodes, Func`3 computeReplacementNode, IEnumerable`1 tokens, Func`3 computeReplacementToken, IEnumerable`1 trivia, Func`3 computeReplacementTrivia) in /_/src/Compilers/CSharp/Portable/Syntax/SyntaxReplacer.cs:line 34
   at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxNode.ReplaceCore[TNode](IEnumerable`1 nodes, Func`3 computeReplacementNode, IEnumerable`1 tokens, Func`3 computeReplacementToken, IEnumerable`1 trivia, Func`3 computeReplacementTrivia) in /_/src/Compilers/CSharp/Portable/Syntax/CSharpSyntaxNode.cs:line 488
   at Microsoft.CodeAnalysis.SyntaxNodeExtensions.ReplaceNodes[TRoot,TNode](TRoot root, IEnumerable`1 nodes, Func`3 computeReplacementNode) in /_/src/Compilers/Core/Portable/Syntax/SyntaxNodeExtensions.cs:line 60
   at Microsoft.CodeAnalysis.ChangeSignature.AbstractChangeSignatureService.<CreateUpdatedSolutionAsync>d__20.MoveNext() in /_/src/Features/Core/Portable/ChangeSignature/AbstractChangeSignatureService.cs:line 368
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.ChangeSignature.AbstractChangeSignatureService.<<ChangeSignatureWithContextAsync>g__GetChangeSignatureResultAsync|17_0>d.MoveNext() in /_/src/Features/Core/Portable/ChangeSignature/AbstractChangeSignatureService.cs:line 190
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.ChangeSignature.AbstractChangeSignatureService.<ChangeSignatureWithContextAsync>d__17.MoveNext() in /_/src/Features/Core/Portable/ChangeSignature/AbstractChangeSignatureService.cs:line 176
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Editor.UnitTests.ChangeSignature.ChangeSignatureTestState.<ChangeSignatureAsync>d__16.MoveNext() in /_/src/EditorFeatures/DiagnosticsTestUtilities/ChangeSignature/ChangeSignatureTestState.cs:line 84
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Editor.UnitTests.ChangeSignature.AbstractChangeSignatureTests.<TestChangeSignatureViaCommandAsync>d__5.MoveNext() in /_/src/EditorFeatures/DiagnosticsTestUtilities/ChangeSignature/AbstractChangeSignatureTests.cs:line 109
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.ChangeSignature.ChangeSignatureTests.<AddParameters_NoLastWhitespaceTrivia>d__45.MoveNext() in /_/src/EditorFeatures/CSharpTest/ChangeSignature/AddParameterTests.cs:line 1303
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Results File: C:\h\w\A7B50967\w\AF10094D\e\Microsoft.CodeAnalysis.CSharp.EditorFeatures.UnitTests.dll.6_net472_x64_test_results.xml

Failed!  - Failed:     1, Passed:   912, Skipped:     0, Total:   913, Duration: 40 s - Microsoft.CodeAnalysis.CSharp.EditorFeatures.UnitTests.dll (net472)