Added exception handling for better tests.

BlazorApp/BlazorApp.csproj

@@ -21,6 +21,7 @@
 		  <PrivateAssets>all</PrivateAssets>
 		  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 		</PackageReference>
+		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
 		<PackageReference Include="Scrutor" Version="6.1.0" />
 	</ItemGroup>
 

BlazorApp/Middlewares/ErrorHandlingMiddleware.cs

@@ -0,0 +1,71 @@
+using System.Net;
+using BlazorApp.Models.Exceptions;
+using Newtonsoft.Json;
+
+namespace BlazorApp.Middlewares
+{
+    public class ErrorHandlingMiddleware
+    {
+        private readonly RequestDelegate next;
+        private readonly ILogger<ErrorHandlingMiddleware> _logger;
+
+        public ErrorHandlingMiddleware(
+            RequestDelegate next,
+            ILogger<ErrorHandlingMiddleware> logger)
+        {
+            this.next = next;
+            this._logger = logger;
+        }
+
+        public async Task Invoke(HttpContext context)
+        {
+            try
+            {
+                await next(context);
+            }
+            catch (System.Exception ex)
+            {
+                await this.HandleAsync(context, ex);
+            }
+        }
+
+        private async Task HandleAsync(HttpContext context, System.Exception exception)
+        {
+            HandledException handled = this.HandleException(exception);
+
+            this._logger.LogError(exception, $"returning code {handled.StatusCode} and payload {handled.Message}");
+
+            context.Response.ContentType = "application/json";
+            context.Response.StatusCode = (int)handled.StatusCode;
+            await context.Response.WriteAsync(handled.Message);
+        }
+
+        protected HandledException HandleException(System.Exception exception)
+        {
+            HttpStatusCode statusCode;
+
+            if (exception is NotFoundException)
+            {
+                statusCode = HttpStatusCode.NotFound;
+            }
+            else if (exception is ValidationException)
+            {
+                statusCode = HttpStatusCode.BadRequest;
+            }
+            else if (exception is BusinessException)
+            {
+                statusCode = HttpStatusCode.InternalServerError;
+            }
+            else
+            {
+                statusCode = HttpStatusCode.InternalServerError;
+            }
+
+            return new HandledException() 
+            { 
+                StatusCode = statusCode, 
+                Message = JsonConvert.SerializeObject(new { error = exception.Message })
+            };
+        }
+    }
+}

BlazorApp/Models/Exceptions/BusinessException.cs

@@ -0,0 +1,9 @@
+namespace BlazorApp.Models.Exceptions
+{
+    public class BusinessException : System.Exception
+    {
+        public BusinessException() : base() { }
+        public BusinessException(String message) : base(message) { }
+        public BusinessException(String message, System.Exception innerException) : base(message, innerException) { }
+    }
+}

BlazorApp/Models/Exceptions/HandledException.cs

@@ -0,0 +1,10 @@
+using System.Net;
+
+namespace BlazorApp.Models.Exceptions
+{
+    public class HandledException
+    {
+        public HttpStatusCode StatusCode { get; set; }
+        public string Message { get; set; }
+    }
+}

BlazorApp/Models/Exceptions/NotFoundException.cs

@@ -0,0 +1,9 @@
+namespace BlazorApp.Models.Exceptions
+{
+    public class NotFoundException : System.Exception
+    {
+        public NotFoundException() : base() { }
+        public NotFoundException(String message) : base(message) { }
+        public NotFoundException(String message, System.Exception innerException) : base(message, innerException) { }
+    }
+}

BlazorApp/Models/Exceptions/ValidationException.cs

@@ -0,0 +1,9 @@
+namespace BlazorApp.Models.Exceptions
+{
+    public class ValidationException : System.Exception
+    {
+        public ValidationException() : base() { }
+        public ValidationException(String message) : base(message) { }
+        public ValidationException(String message, System.Exception innerException) : base(message, innerException) { }
+    }
+}

BlazorApp/Program.cs

@@ -4,6 +4,7 @@ using BlazorApp.Components;
 using BlazorApp.Data.Context;
 using BlazorApp.Interfaces.Repositories;
 using BlazorApp.Interfaces.Services;
+using BlazorApp.Middlewares;
 using BlazorApp.Models.Config;
 using BlazorApp.Repositories.Database;
 using BlazorApp.Repositories.InMemory;
@@ -40,6 +41,7 @@ builder.Services.AddClientServices();
 
 var app = builder.Build();
 
+app.UseMiddleware(typeof(ErrorHandlingMiddleware));
 app.ExecuteDbMigration();
 
 if (app.Environment.IsDevelopment())

BlazorApp/Repositories/Database/CustomerDatabaseRepository.cs

@@ -1,9 +1,9 @@
 using BlazorApp.Data;
 using BlazorApp.Data.Context;
 using BlazorApp.Interfaces.Repositories;
+using BlazorApp.Models.Exceptions;
 using BlazorApp.Shared.Queries;
 using Microsoft.EntityFrameworkCore;
-using System.ComponentModel.DataAnnotations;
 
 namespace BlazorApp.Repositories.Database
 {
@@ -27,7 +27,7 @@ namespace BlazorApp.Repositories.Database
             Customer data = await this._dbContext.Customers.FindAsync(id);
             if (data is null)
             {
-                throw new KeyNotFoundException($"Customer with id: {id} not found");
+                throw new NotFoundException($"Customer with id: {id} not found");
             }
             return data;
         }

BlazorApp/Services/BaseService.cs

@@ -0,0 +1,11 @@
+namespace BlazorApp.Services
+{
+    public class BaseService<T>
+    {
+        protected readonly ILogger<T> _logger;
+        public BaseService(ILogger<T> logger)
+        {
+            this._logger = logger;
+        }
+    }
+}

BlazorApp/Services/CustomerService.cs

@@ -1,32 +1,38 @@
 using BlazorApp.Interfaces.Repositories;
 using BlazorApp.Interfaces.Services;
+using BlazorApp.Models.Exceptions;
 using BlazorApp.Shared.Models;
 using BlazorApp.Shared.Models.Pagination;
 using BlazorApp.Shared.Queries;
 
 namespace BlazorApp.Services
 {
-    public class CustomerService : ICustomerService
+    public class CustomerService : BaseService<CustomerService>, ICustomerService
     {
         private readonly ICustomerRepository _customerRepository;
-        public CustomerService(ICustomerRepository customerRepository) 
+        public CustomerService(ICustomerRepository customerRepository, ILogger<CustomerService> logger) : base(logger)
         {
             this._customerRepository = customerRepository;
         }
 
         public async Task Delete(string id)
         {
+            this._logger.LogInformation($"Gonna delete customer with id: {id}");
             await this._customerRepository.Delete(id);
+            this._logger.LogInformation($"Deleted customer with id: {id}");
         }
 
         public async Task<Customer> Get(string id)
         {
+            this._logger.LogInformation($"Gonna get customer with id: {id}");
             Data.Customer data = await this._customerRepository.Get(id);
+            this._logger.LogInformation($"Got customer with id: {id}");
             return data.Convert();
         }
 
         public async Task<PaginatedResult<Customer>> Query(CustomerQuery query)
         {
+            this._logger.LogInformation($"Querying customers");
             IEnumerable<Data.Customer> datas = await this._customerRepository.Query(query);
             return new PaginatedResult<Customer>()
             {
@@ -37,12 +43,16 @@ namespace BlazorApp.Services
 
         public async Task Save(Customer customer)
         {
+            this._logger.LogInformation($"Gonna save new customer");
             await this._customerRepository.Save(customer);
+            this._logger.LogInformation($"New customer saved successfully");
         }
 
         public async Task Update(Customer customer)
         {
+            this._logger.LogInformation($"Gonna update customer with id: {customer.Id}");
             await this._customerRepository.Update(customer);
+            this._logger.LogInformation($"Customer  with id: {customer.Id} updated successfully");
         }
 
         public async Task<int> Count() => await this._customerRepository.Count();

BlazorApp/appsettings.Development.json

@@ -14,6 +14,6 @@
     "CustomerCacheKey": "customer",
     "CustomerCacheSeconds": 5
   },
-  "MockCustomers": true,
+  "MockCustomers": false,
   "MockCustomersCount": 238
 }