MakeLocalFunctionStaticTests.cs

// 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.
 
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CodeStyle;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.CodeStyle;
using Microsoft.CodeAnalysis.CSharp.MakeLocalFunctionStatic;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Diagnostics;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
using Xunit.Abstractions;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.MakeLocalFunctionStatic;
 
public partial class MakeLocalFunctionStaticTests : AbstractCSharpDiagnosticProviderBasedUserDiagnosticTest_NoEditor
{
    public MakeLocalFunctionStaticTests(ITestOutputHelper logger)
      : base(logger)
    {
    }
 
    internal override (DiagnosticAnalyzer, CodeFixProvider) CreateDiagnosticProviderAndFixer(Workspace workspace)
        => (new MakeLocalFunctionStaticDiagnosticAnalyzer(), new MakeLocalFunctionStaticCodeFixProvider());
 
    private static readonly ParseOptions CSharp72ParseOptions = CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.CSharp7_2);
    private static readonly ParseOptions CSharp8ParseOptions = CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.CSharp8);
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestAboveCSharp8()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    int [||]fibonacci(int n)
                    {
                        return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
                    }
                }
            }
            """,
            """
            using System;
 
            class C
            {
                void M()
                {
                    static int fibonacci(int n)
                    {
                        return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
                    }
                }
            }
            """,
parseOptions: CSharp8ParseOptions);
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsUseSimpleUsingStatement)]
    public async Task TestWithOptionOff()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    int [||]fibonacci(int n)
                    {
                        return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
                    }
                }
            }
            """,
new TestParameters(
parseOptions: CSharp8ParseOptions,
options: Option(CSharpCodeStyleOptions.PreferStaticLocalFunction, CodeStyleOption2.FalseWithSilentEnforcement)));
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestMissingIfAlreadyStatic()
    {
        await TestMissingAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    static int [||]fibonacci(int n)
                    {
                        return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
                    }
                }
            }
            """, parameters: new TestParameters(parseOptions: CSharp8ParseOptions));
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestMissingPriorToCSharp8()
    {
        await TestMissingAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    int [||]fibonacci(int n)
                    {
                        return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
                    }
                }
            }
            """, parameters: new TestParameters(parseOptions: CSharp72ParseOptions));
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestMissingIfCapturesValue()
    {
        await TestMissingAsync(
            """
            using System;
 
            class C
            {
                void M(int i)
                {
                    int [||]fibonacci(int n)
                    {
                        return i <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
                    }
                }
            }
            """, parameters: new TestParameters(parseOptions: CSharp8ParseOptions));
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestMissingIfCapturesThis()
    {
        await TestMissingAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    int [||]fibonacci(int n)
                    {
                        M();
                        return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
                    }
                }
            }
            """, parameters: new TestParameters(parseOptions: CSharp8ParseOptions));
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestAsyncFunction()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    async Task<int> [||]fibonacci(int n)
                    {
                        return n <= 1 ? n : await fibonacci(n - 1) + await fibonacci(n - 2);
                    }
                }
            }
            """,
            """
            using System;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    static async Task<int> fibonacci(int n)
                    {
                        return n <= 1 ? n : await fibonacci(n - 1) + await fibonacci(n - 2);
                    }
                }
            }
            """,
parseOptions: CSharp8ParseOptions);
    }
 
    [Theory, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [InlineData("")]
    [InlineData("\r\n")]
    [InlineData("\r\n\r\n")]
    public async Task TestLeadingTriviaAfterSemicolon(string leadingTrivia)
    {
        await TestInRegularAndScriptAsync(
$@"using System;
 
class C
{{
    void M()
    {{
        int x;{leadingTrivia}
        int [||]fibonacci(int n)
        {{
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }}
    }}
}}",
"""
using System;
 
class C
{
    void M()
    {
        int x;
 
        static int fibonacci(int n)
        {
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }
    }
}
""",
parseOptions: CSharp8ParseOptions);
    }
 
    [Theory, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [InlineData("")]
    [InlineData("\r\n")]
    [InlineData("\r\n\r\n")]
    public async Task TestLeadingTriviaAfterOpenBrace(string leadingTrivia)
    {
        await TestInRegularAndScriptAsync(
$@"using System;
 
class C
{{
    void M()
    {{{leadingTrivia}
        int [||]fibonacci(int n)
        {{
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }}
    }}
}}",
"""
using System;
 
class C
{
    void M()
    {
        static int fibonacci(int n)
        {
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }
    }
}
""",
parseOptions: CSharp8ParseOptions);
    }
 
    [Theory, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [InlineData("")]
    [InlineData("\r\n")]
    [InlineData("\r\n\r\n")]
    public async Task TestLeadingTriviaAfterLocalFunction(string leadingTrivia)
    {
        await TestInRegularAndScriptAsync(
$@"using System;
 
class C
{{
    void M()
    {{
        bool otherFunction()
        {{
            return true;
        }}{leadingTrivia}
        int [||]fibonacci(int n)
        {{
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }}
    }}
}}",
"""
using System;
 
class C
{
    void M()
    {
        bool otherFunction()
        {
            return true;
        }
 
        static int fibonacci(int n)
        {
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }
    }
}
""",
parseOptions: CSharp8ParseOptions);
    }
 
    [Theory, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [InlineData("")]
    [InlineData("\r\n")]
    [InlineData("\r\n\r\n")]
    public async Task TestLeadingTriviaAfterExpressionBodyLocalFunction(string leadingTrivia)
    {
        await TestInRegularAndScriptAsync(
$@"using System;
 
class C
{{
    void M()
    {{
        bool otherFunction() => true;{leadingTrivia}
        int [||]fibonacci(int n) => n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
    }}
}}",
"""
using System;
 
class C
{
    void M()
    {
        bool otherFunction() => true;
 
        static int fibonacci(int n) => n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
    }
}
""",
parseOptions: CSharp8ParseOptions);
    }
 
    [Theory, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [InlineData("")]
    [InlineData("\r\n")]
    [InlineData("\r\n\r\n")]
    public async Task TestLeadingTriviaAfterComment(string leadingTrivia)
    {
        await TestInRegularAndScriptAsync(
$@"using System;
 
class C
{{
    void M()
    {{
        //Local function comment{leadingTrivia}
        int [||]fibonacci(int n)
        {{
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }}
    }}
}}",
$@"using System;
 
class C
{{
    void M()
    {{
        //Local function comment{leadingTrivia}
        static int fibonacci(int n)
        {{
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }}
    }}
}}",
parseOptions: CSharp8ParseOptions);
    }
 
    [Theory, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [InlineData("\r\n")]
    [InlineData("\r\n\r\n")]
    public async Task TestLeadingTriviaBeforeComment(string leadingTrivia)
    {
        await TestInRegularAndScriptAsync(
$@"using System;
 
class C
{{
    void M()
    {{{leadingTrivia}
        //Local function comment
        int [||]fibonacci(int n)
        {{
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }}
    }}
}}",
$@"using System;
 
class C
{{
    void M()
    {{{leadingTrivia}
        //Local function comment
        static int fibonacci(int n)
        {{
            return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
        }}
    }}
}}",
parseOptions: CSharp8ParseOptions);
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [WorkItem("https://github.com/dotnet/roslyn/issues/46858")]
    public async Task TestMissingIfAnotherLocalFunctionCalled()
    {
        await TestMissingAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    void [||]A()
                    {
                        B();
                    }
 
                    void B()
                    {
                    }
                }
            }
            """, parameters: new TestParameters(parseOptions: CSharp8ParseOptions));
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestCallingStaticLocalFunction()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    void [||]A()
                    {
                        B();
                    }
 
                    static void B()
                    {
                    }
                }
            }
            """,
            """
            using System;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    static void A()
                    {
                        B();
                    }
 
                    static void B()
                    {
                    }
                }
            }
            """,
parseOptions: CSharp8ParseOptions);
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    public async Task TestCallingNestedLocalFunction()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    void [||]A()
                    {
                        B();
 
                        void B()
                        {
                        }
                    }
                }
            }
            """,
            """
            using System;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    static void A()
                    {
                        B();
 
                        void B()
                        {
                        }
                    }
                }
            }
            """,
parseOptions: CSharp8ParseOptions);
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [WorkItem("https://github.com/dotnet/roslyn/issues/53179")]
    public async Task TestLocalFunctionAsTopLevelStatement()
    {
        await TestAsync("""
            void [||]A()
            {
            }
            """, """
            static void A()
            {
            }
            """,
parseOptions: CSharp8ParseOptions);
    }
 
    [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeLocalFunctionStatic)]
    [WorkItem("https://github.com/dotnet/roslyn/issues/59286")]
    public async Task TestUnsafeLocalFunction()
    {
        await TestAsync("""
            unsafe void [||]A()
            {
            }
            """, """
            static unsafe void A()
            {
            }
            """,
parseOptions: CSharp8ParseOptions);
    }
}
File: src\Analyzers\CSharp\Tests\MakeLocalFunctionStatic\MakeLocalFunctionStaticTests.cs	Web Access
Project: src\src\Features\CSharpTest\Microsoft.CodeAnalysis.CSharp.Features.UnitTests.csproj (Microsoft.CodeAnalysis.CSharp.Features.UnitTests)