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CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Services/CoreWebAPIMoqDemo.Services.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Services/IWeatherForecastService.cs

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+
+namespace CoreWebAPIMoqDemo.Services
+{
+    public interface IWeatherForecastService
+    {
+        Task<WeatherForecast[]> GetWeatherForecast();
+    }
+
+    public record WeatherForecast(DateTime Date, int TemperatureC, string? Summary)
+    {
+        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+    }
+}

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Services/WeatherForecastService.cs

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+
+namespace CoreWebAPIMoqDemo.Services
+{
+    public class WeatherForecastService : IWeatherForecastService
+    {
+        string[] summaries = new string[]
+        {
+            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+        };
+
+        public async Task<WeatherForecast[]> GetWeatherForecast()
+        {
+            var forecast = Enumerable.Range(1, 5).Select(index =>
+                new WeatherForecast
+                (
+                    DateTime.Now.AddDays(index),
+                    Random.Shared.Next(-20, 55),
+                    summaries[Random.Shared.Next(summaries.Length)]
+                )).ToArray();
+            return forecast;
+        }
+    }
+}

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Tests/CoreWebAPIMoqDemo.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.6" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+    <PackageReference Include="Moq" Version="4.18.1" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.1.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CoreWebAPIMoqDemo\CoreWebAPIMoqDemo.csproj" />
+  </ItemGroup>
+
+</Project>

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Tests/MockServices.cs

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+using Moq;
+using CoreWebAPIMoqDemo.Services;
+using System.Reflection;
+
+namespace CoreWebAPIMoqDemo.Tests
+{
+    internal class MockServices
+    {
+        public Mock<IWeatherForecastService> WeatherForecastServiceMock { get; init; } 
+
+        public MockServices()
+        {
+            WeatherForecastServiceMock = new Mock<IWeatherForecastService>();
+        }
+
+        /// <summary>
+        /// This returns the collection of all mock service's interface type and the mock object, defined here i.e. <see cref="WeatherForecastServiceMock"/>.
+        /// </summary>
+        /// <returns></returns>
+        public IEnumerable<(Type, object)> GetMocks()
+        {
+            return GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance)
+                .Select(x =>
+                {
+                    var interfaceType = x.PropertyType.GetGenericArguments()[0];
+                    var value = x.GetValue(this) as Mock;
+
+                    return (interfaceType, value.Object);
+                })
+                .ToArray();
+        }
+    }
+}

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Tests/TestMoqPOCApplication.cs

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+using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using CoreWebAPIMoqDemo.Services;
+
+namespace CoreWebAPIMoqDemo.Tests
+{
+    internal class TestMoqPOCApplication : WebApplicationFactory<Program>
+    {
+        private readonly MockServices _mockServices;
+        public TestMoqPOCApplication(MockServices mockServices)
+        {
+            _mockServices = mockServices;
+        }
+
+        protected override IHost CreateHost(IHostBuilder builder)
+        {
+            builder.ConfigureServices(services => {
+                foreach ((var interfaceType, var serviceMock) in _mockServices.GetMocks())
+                {
+                    services.Remove(services.SingleOrDefault(d => d.ServiceType == interfaceType));
+                    services.AddSingleton(typeof(IWeatherForecastService), serviceMock);
+                }
+            });
+            return base.CreateHost(builder);
+
+        }
+
+    }
+}

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Tests/Usings.cs

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+global using Xunit;

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.Tests/WeatherForecastTests.cs

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+using Moq;
+using CoreWebAPIMoqDemo.Services;
+using Newtonsoft.Json;
+
+namespace CoreWebAPIMoqDemo.Tests
+{
+    public class WeatherForecastTests
+    {
+        private readonly TestMoqPOCApplication _testMoqPOCApplication;
+        private readonly MockServices _mockServices;
+        public readonly HttpClient _client;
+
+        public WeatherForecastTests()
+        {
+            _mockServices = new MockServices();
+            _testMoqPOCApplication = new TestMoqPOCApplication(_mockServices);
+            _client = _testMoqPOCApplication.CreateClient();
+        }
+
+        [Fact]
+        public async void GetWeatherForecastTest()
+        {
+            var expResult = new WeatherForecast[]
+            {
+                new WeatherForecast(DateTime.Now, 26, "Bengaluru")
+            };
+            _mockServices.WeatherForecastServiceMock.Setup(m => m.GetWeatherForecast()).ReturnsAsync(expResult);
+
+            var response = await _client.GetAsync("/weatherforecast");
+            string jsonString = await response.Content.ReadAsStringAsync();
+            var result = JsonConvert.DeserializeObject<WeatherForecast[]>(jsonString);
+
+            Assert.Equal(response.StatusCode, System.Net.HttpStatusCode.OK);
+            Assert.Equal(expResult, result);
+
+        }
+    }
+}

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo/CoreWebAPIMoqDemo.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CoreWebAPIMoqDemo.Services\CoreWebAPIMoqDemo.Services.csproj" />
+  </ItemGroup>
+
+</Project>

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo/Program.cs

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+using CoreWebAPIMoqDemo.Services;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+builder.Services.AddSingleton<IWeatherForecastService, WeatherForecastService>();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+}
+
+app.UseHttpsRedirection();
+
+
+
+app.MapGet("/weatherforecast", async (IWeatherForecastService service) => 
+{
+    return await service.GetWeatherForecast();
+})
+.WithName("GetWeatherForecast");
+
+app.Run();
+
+public partial class Program { }

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:56324",
+      "sslPort": 44384
+    }
+  },
+  "profiles": {
+    "MoqPOC": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7257;http://localhost:5257",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

CoreWebAPIMoqDemo/CoreWebAPIMoqDemo/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

CoreWebAPIMoqDemo/MoqDemoSol.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.1.32421.90
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CoreWebAPIMoqDemo", "CoreWebAPIMoqDemo\CoreWebAPIMoqDemo.csproj", "{DC6D47D1-B105-45F2-A6EB-C8748DE5E594}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CoreWebAPIMoqDemo.Services", "CoreWebAPIMoqDemo.Services\CoreWebAPIMoqDemo.Services.csproj", "{5CBB1B82-444D-44D1-8A29-1CB38B47DA69}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CoreWebAPIMoqDemo.Tests", "CoreWebAPIMoqDemo.Tests\CoreWebAPIMoqDemo.Tests.csproj", "{182C832F-5A95-4E6B-A701-D216DF20EE1A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{DC6D47D1-B105-45F2-A6EB-C8748DE5E594}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DC6D47D1-B105-45F2-A6EB-C8748DE5E594}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DC6D47D1-B105-45F2-A6EB-C8748DE5E594}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DC6D47D1-B105-45F2-A6EB-C8748DE5E594}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5CBB1B82-444D-44D1-8A29-1CB38B47DA69}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5CBB1B82-444D-44D1-8A29-1CB38B47DA69}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5CBB1B82-444D-44D1-8A29-1CB38B47DA69}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5CBB1B82-444D-44D1-8A29-1CB38B47DA69}.Release|Any CPU.Build.0 = Release|Any CPU
+		{182C832F-5A95-4E6B-A701-D216DF20EE1A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{182C832F-5A95-4E6B-A701-D216DF20EE1A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{182C832F-5A95-4E6B-A701-D216DF20EE1A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{182C832F-5A95-4E6B-A701-D216DF20EE1A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8EA605B8-2B7B-4103-95F3-2076EFE612B4}
+	EndGlobalSection
+EndGlobal