src/EditorFeatures/CSharpTest/EventHookup/EventHookupCommandHandlerTests.cs - main - githubmirror/roslyn

src/EditorFeatures/CSharpTest/EventHookup/EventHookupCommandHandlerTests.cs
1 227 строк35 KB
Amadeusz Wieczorek
fix tests and add one test
05 дек 2025, 02:25
05 дек 2025, 02:2555451a8
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#nullable disable

using System.Threading.Tasks;
using System.Xml.Linq;
using Microsoft.CodeAnalysis.CodeStyle;
using Microsoft.CodeAnalysis.Editor.UnitTests.CodeActions;
using Microsoft.CodeAnalysis.Editor.UnitTests.Diagnostics.NamingStyles;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;

namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.EventHookup;

[UseExportProvider]
[Trait(Traits.Feature, Traits.Features.EventHookup)]
public sealed class EventHookupCommandHandlerTests
{
    private readonly NamingStylesTestOptionSets _namingOptions = new(LanguageNames.CSharp);

    [WpfFact]
    public async Task HandlerName_EventInThisClass()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");
    }

    [WpfFact]
    public async Task Handler_DismissSuggestionService()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");
        testState.AssertSuggestionServiceWasDismissed();
    }

    [WpfFact, WorkItem("https://github.com/dotnet/roslyn/issues/20999")]
    public async Task HandlerName_EventInThisClass_CamelCaseRule()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = new EventHookupTestState(
            EventHookupTestState.GetWorkspaceXml(markup), _namingOptions.MethodNamesAreCamelCase);

        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("c_MyEvent");
    }

    [WpfFact]
    public async Task HandlerName_EventOnLocal()
    {
        var markup = """
            class C
            {
                public event System.Action MyEvent;
            }

            class D
            {
                void M()
                {
                    C local = new C();
                    local.MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("Local_MyEvent");
    }

    [WpfFact]
    public async Task HandlerName_EventOnFieldOfObject()
    {
        var markup = """
            class C
            {
                public event System.Action MyEvent;
            }

            class D
            {
                public C cfield = new C();
            }

            class E
            {
                void Goo()
                {
                    D local = new D();
                    local.cfield.MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("Cfield_MyEvent");
    }

    [WpfFact]
    public async Task NoHookupOnIntegerPlusEquals()
    {
        var markup = """
            class C
            {
                void Goo()
                {
                    int x = 7;
                    x +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();

        // Make sure that sending the tab works correctly. Note the 4 spaces after the +=
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                void Goo()
                {
                    int x = 7;
                    x +=    
                }
            }
            """);
    }

    [WpfFact]
    public async Task HandlerName_DefaultHandlerNameAlreadyExistsWithSameNonStaticState()
    {
        var markup = """
            class C
            {
                public event System.Action MyEvent;

                void Goo()
                {
                    MyEvent +$$
                }

                private void C_MyEvent()
                {
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent1");
    }

    [WpfFact]
    public async Task HandlerName_DefaultHandlerNameAlreadyExistsWithDifferentStaticState()
    {
        var markup = """
            class C
            {
                public event System.Action MyEvent;

                void Goo()
                {
                    MyEvent +$$
                }

                private static void C_MyEvent()
                {
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent1");
    }

    [WpfFact]
    public async Task HandlerName_DefaultHandlerNameAlreadyExistsAsField()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                int C_MyEvent;

                void M(string[] args)
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent1");
    }

    [WpfFact]
    public async Task HookupInLambdaInLocalDeclaration()
    {
        var markup = """
            class C
            {
                public event System.Action MyEvent;

                void Goo()
                {
                    Action a = () => MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");
    }

    [WpfFact]
    public async Task TypingSpacesDoesNotDismiss()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendTypeChar(' ');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");
    }

    [WpfFact]
    public async Task TypingLettersDismisses()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendTypeChar('d');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
    }

    [WpfFact]
    public async Task TypingEqualsInSessionDismisses()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
    }

    [WpfFact]
    public async Task CancelViaLeftKey()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendTypeChar(' ');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendLeftKey();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendLeftKey();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
    }

    [WpfFact]
    public async Task CancelViaBackspace()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);

        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendTypeChar(' ');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");

        testState.SendBackspace();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
    }

    [WpfFact]
    public async Task EventHookupBeforeEventHookup()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent += C_MyEvent1;
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent1()
                {
                    throw new System.NotImplementedException();
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupBeforeComment()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$ // Awesome Comment!
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent += C_MyEvent1; // Awesome Comment!
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent1()
                {
                    throw new System.NotImplementedException();
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupInArgument()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    Goo(() => MyEvent +$$)
                }

                private void Goo(Action a)
                {
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    Goo(() => MyEvent += C_MyEvent;)
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }

                private void Goo(Action a)
                {
                }
            }
            """);
    }

    [WpfFact]
    public async Task HookupInFieldDeclarationSingleLineLambda()
    {
        var markup = """
            class C
            {
                static event System.Action MyEvent;
                System.Action A = () => MyEvent +$$
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                static event System.Action MyEvent;
                System.Action A = () => MyEvent += C_MyEvent;

                private static void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task HookupInFieldDeclarationMultiLineLambda()
    {
        var markup = """
            class C
            {
                static event System.Action MyEvent;
                System.Action A = () =>
                {
                    MyEvent +$$
                };
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                static event System.Action MyEvent;
                System.Action A = () =>
                {
                    MyEvent += C_MyEvent;
                };

                private static void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupInUnformattedPosition1()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupInUnformattedPosition2()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {MyEvent                     +$$
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');

        for (var i = 0; i < 20; i++)
        {
            testState.SendTypeChar(' ');
        }

        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent += C_MyEvent1;
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent1()
                {
                    throw new System.NotImplementedException();
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task SessionCancelledByCharacterBeforeEventHookupDeterminationCompleted()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SetEventHookupCheckMutex();

        testState.SendTypeChar('=');
        testState.SendTypeChar('z');

        testState.ReleaseEventHookupCheckMutex();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
    }

    [WpfFact]
    public async Task TabBeforeEventHookupDeterminationCompleted()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SetEventHookupCheckMutex();

        testState.SendTypeChar('=');

        // tab releases the mutex
        testState.SendTab();

        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent += C_MyEvent;
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task MoveCaretOutOfSpanBeforeEventHookupDeterminationCompleted()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SetEventHookupCheckMutex();

        testState.SendTypeChar('=');
        testState.SendLeftKey();
        testState.ReleaseEventHookupCheckMutex();

        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
    }

    [WpfFact]
    public async Task EnsureNameUniquenessInPartialClasses()
    {
        var markup = """
            public partial class C
            {
                event System.Action MyEvent;
                public async Task Test()
                {
                    MyEvent +$$
                }
            }

            public partial class C
            {
                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent1");
    }

    [WpfFact]
    public async Task EnsureNameUniquenessAgainstBaseClasses()
    {
        var markup = """
            class Base
            {
                protected int Console_CancelKeyPress;
            }
            class Program : Base
            {
                void Main(string[] args)
                {
                    var goo = Console_CancelKeyPress + 23;
                    System.Console.CancelKeyPress +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("Console_CancelKeyPress1");
    }

    [WpfFact]
    public async Task EnsureNameUniquenessAgainstParameters()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;

                void M(int C_MyEvent)
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent1");
    }

    [WpfFact]
    public async Task DelegateInvokeMethodReturnsNonVoid()
    {
        var markup = """
            class C
            {
                delegate int D(double d);
                event D MyEvent;

                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                delegate int D(double d);
                event D MyEvent;

                void M()
                {
                    MyEvent += C_MyEvent;
                }

                private int C_MyEvent(double d)
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/553660")]
    public async Task PlusEqualsInsideComment()
    {
        var markup = """
            class C
            {
                void M()
                {
                    // +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertNotShowing();
    }

    [WpfFact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/951664")]
    public async Task UseInvocationLocationTypeNameWhenEventIsMemberOfBaseType()
    {
        var markup = """
            namespace Scenarios
            {
                public class DelegateTest_Generics_NonGenericClass
                {
                    public delegate void D1&lt;T&gt;();
                    public event D1&lt;string&gt; E1;
                }
            }

            class TestClass_T1_S1_4 : Scenarios.DelegateTest_Generics_NonGenericClass
            {
                void Method()
                {
                    E1 +$$
                }
            }
            """;

        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            namespace Scenarios
            {
                public class DelegateTest_Generics_NonGenericClass
                {
                    public delegate void D1<T>();
                    public event D1<string> E1;
                }
            }

            class TestClass_T1_S1_4 : Scenarios.DelegateTest_Generics_NonGenericClass
            {
                void Method()
                {
                    E1 += TestClass_T1_S1_4_E1;
                }

                private void TestClass_T1_S1_4_E1()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupWithQualifiedMethodAccess()
    {
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup, QualifyMethodAccessWithNotification(NotificationOption2.Error));
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent += this.C_MyEvent;
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupRemovesInaccessibleAttributes()
    {
        var workspaceXml = """
            <Workspace>
                <Project Language="C#" AssemblyName="A" CommonReferences="true">
                    <Document>using System;

            public static class C
            {
                public static event DelegateType E;

                public delegate void DelegateType([ShouldBeRemovedInternalAttribute] object o);
            }

            internal class ShouldBeRemovedInternalAttribute : Attribute { }</Document>
                </Project>
                <Project Language="C#" CommonReferences="true">
                    <ProjectReference>A</ProjectReference>
                    <Document>class D
            {
                void M()
                {
                    C.E +$$
                }
            }</Document>
                </Project>
            </Workspace>
            """;

        using var testState = new EventHookupTestState(XElement.Parse(workspaceXml), options: null);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class D
            {
                void M()
                {
                    C.E += C_E;
                }

                private void C_E(object o)
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupWithQualifiedMethodAccessAndNotificationOptionSilent()
    {
        // This validates the scenario where the user has stated that they prefer `this.` qualification but the
        // notification level is `Silent`, which means existing violations of the rule won't be flagged but newly
        // generated code will conform appropriately.
        var markup = """
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup, QualifyMethodAccessWithNotification(NotificationOption2.Silent));
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            class C
            {
                event System.Action MyEvent;
                void M()
                {
                    MyEvent += this.C_MyEvent;
                }

                private void C_MyEvent()
                {
                    throw new System.NotImplementedException();
                }
            }
            """);
    }

    [WpfFact, WorkItem("https://github.com/dotnet/roslyn/issues/58474")]
    public async Task EventHookupInTopLevelCode()
    {
        var markup = """
            System.AppDomain.CurrentDomain.UnhandledException +$$
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertCodeIs("""
            System.AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;

            void CurrentDomain_UnhandledException(object sender, System.UnhandledExceptionEventArgs e)
            {
                throw new System.NotImplementedException();
            }
            """);
    }

    [WpfFact]
    public async Task EventHookupAtEndOfDocument()
    {
        var markup = """
            System.AppDomain.CurrentDomain.UnhandledException +$$
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');

        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("CurrentDomain_UnhandledException");

        var expectedCode = """
            System.AppDomain.CurrentDomain.UnhandledException +=
            """;
        testState.AssertCodeIs(expectedCode);

        testState.SendTab();
        await testState.WaitForAsynchronousOperationsAsync();

        expectedCode = """
            System.AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;

            void CurrentDomain_UnhandledException(object sender, System.UnhandledExceptionEventArgs e)
            {
                throw new System.NotImplementedException();
            }
            """;
        testState.AssertCodeIs(expectedCode);
    }

    [WpfFact, WorkItem("https://github.com/dotnet/roslyn/issues/59935")]
    public async Task HandlerName_EventInGenericClass()
    {
        var markup = """
            using System;

            class C
            {
                void M()
                {
                    Generic&lt;int&gt;.MyEvent +$$
                }
            }

            class Generic&lt;T&gt;
            {
                public static event EventHandler MyEvent;
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("Generic_MyEvent");
    }

    [WpfFact]
    public async Task HandlerName_GlobalAlias01()
    {
        var markup = """
            using System;

            class C
            {
                void M()
                {
                    global::D.MyEvent +$$
                }
            }

            class D
            {
                public static event EventHandler MyEvent;
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("D_MyEvent");
    }

    [WpfFact]
    public async Task HandlerName_GlobalAlias02()
    {
        var markup = """
            using System;

            class C
            {
                void M()
                {
                    global::Generic&lt;int&gt;.MyEvent +$$
                }
            }

            class Generic&lt;T&gt;
            {
                public static event EventHandler MyEvent;
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("Generic_MyEvent");
    }

    [WpfFact]
    public async Task HandlerName_GlobalAlias03()
    {
        var markup = """
            class Program
            {
                void Main(string[] args)
                {
                    global::System.Console.CancelKeyPress +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("Console_CancelKeyPress");
    }

    [WpfFact]
    public async Task HandlerName_InvocationExpression()
    {
        var markup = """
            using System;

            class C
            {
                public event EventHandler MyEvent;

                public static C CreateC()
                {
                    return new C();
                }

                public void M2()
                {
                    CreateC().MyEvent +$$
                }
            }
            """;
        using var testState = EventHookupTestState.CreateTestState(markup);
        testState.SendTypeChar('=');
        await testState.WaitForAsynchronousOperationsAsync();
        testState.AssertShowing("C_MyEvent");
    }

    private static OptionsCollection QualifyMethodAccessWithNotification(NotificationOption2 notification)
        => new(LanguageNames.CSharp) { { CodeStyleOptions2.QualifyMethodAccess, true, notification } };
}