added my test file and add some implementation of my analyzer

Author: Anh Thi Dao

src/Framework/AspNetCoreAnalyzers/test/WebApplicationBuilder/DisallowConfigureAppConfigureHostBuilderTest.cs

@@ -0,0 +1,127 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.Testing;
+using VerifyCS = Microsoft.AspNetCore.Analyzers.RouteHandlers.CSharpRouteHandlerCodeFixVerifier<
+    Microsoft.AspNetCore.Analyzers.RouteHandlers.RouteHandlerAnalyzer,
+    Microsoft.AspNetCore.Analyzers.RouteHandlers.Fixers.DetectMismatchedParameterOptionalityFixer>;
+
+namespace Microsoft.AspNetCore.Analyzers.WebApplicationBuilder;
+public partial class DisallowConfigureAppConfigureHostBuilderTest
+{
+    private TestDiagnosticAnalyzerRunner Runner { get; } = new(new WebApplicationBuilderAnalyzer());
+    /**
+     * Verify that the correct code produces no diagnostic
+     */ 
+    [Fact]
+    public async Task ConfigurationBuilderRunsWithoutDiagnostic()
+    {
+        // Arrange
+        var source = @"
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+var builder = WebApplication.CreateBuilder(args);
+builder.Configuration.AddJSonFile(fileName, optional: true);
+";
+        // Act
+        var diagnostic = await Runner.GetDiagnosticsAsync(source);
+
+        // Assert
+        Assert.Empty(diagnostic); 
+    }
+    /**
+     * Verify the fixed code and the diagnostic for builder.Host.ConfigureAppConfiguration
+     */
+    [Fact]
+    public async Task ConfigureAppHostBuilderProducesDiagnostic()
+    {
+        // Arrange
+        var source = @"
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+var builder = WebApplication.CreateBuilder(args);
+builder.Host.ConfigureAppConfiguration(builder =>
+{
+    builder.AddJsonFile(fileName, optional: true);
+});
+";
+        var fixedSource = @"
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+var builder = WebApplication.CreateBuilder(args);
+builder.Configuration.AddJsonFile(fileName, optional: true);
+";
+        // Act
+        var expectedDiagnostic = new DiagnosticResult(DiagnosticDescriptors.DisallowConfigureAppConfigureHostBuilder);
+
+        // Assert
+        await VerifyCS.VerifyCodeFixAsync(source, expectedDiagnostic, fixedSource); 
+    }
+
+    /**
+     * Verify the fixed code and the diagnostic for builder.Host.ConfigureHostConfiguration
+     */
+    [Fact]
+    public async Task ConfigureHostHostBuilderProducesDiagnostic()
+    {
+        // Arrange
+        var source = @"
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+var builder = WebApplication.CreateBuilder(args);
+builder.Host.ConfigureHostConfiguration(builder =>
+{
+    builder.AddJsonFile(fileName, optional: true);
+});
+";
+        var fixedSource = @"
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+var builder = WebApplication.CreateBuilder(args);
+builder.Configuration.AddJsonFile(fileName, optional: true);
+";
+        // Act
+        var expectedDiagnostic = new DiagnosticResult(DiagnosticDescriptors.DisallowConfigureAppConfigureHostBuilder);
+
+        // Assert
+        await VerifyCS.VerifyCodeFixAsync(source, expectedDiagnostic, fixedSource);
+    }
+
+    /**
+     * Verify the fixed code and the diagnostic for builder.WebHost.ConfigureAppConfiguration
+     */
+    [Fact]
+    public async Task ConfigureAppWebHostBuilderProducesDiagnostic()
+    {
+        // Arrange
+        var source = @"
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+var builder = WebApplication.CreateBuilder(args);
+builder.WebHost.ConfigureAppConfiguration(builder =>
+{
+    builder.AddJsonFile(fileName, optional: true);
+});
+";
+        var fixedSource = @"
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+var builder = WebApplication.CreateBuilder(args);
+builder.Configuration.AddJsonFile(fileName, optional: true);
+";
+        // Act
+        var expectedDiagnostic = new DiagnosticResult(DiagnosticDescriptors.DisallowConfigureAppConfigureHostBuilder);
+
+        // Assert
+        await VerifyCS.VerifyCodeFixAsync(source, expectedDiagnostic, fixedSource);
+    }
+}