cat on a spaceship

TestGrpcClient/Program.cs

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+using Grpc.Core;
+using Grpc.Net.Client;
+using Svrnty.CQRS.Grpc.Sample.Grpc;
+
+Console.WriteLine("=== gRPC Client Validation Test ===");
+Console.WriteLine();
+
+// Create a gRPC channel
+using var channel = GrpcChannel.ForAddress("http://localhost:5000");
+
+// Create the gRPC client
+var client = new CommandService.CommandServiceClient(channel);
+
+// Test 1: Valid request
+Console.WriteLine("Test 1: Valid AddUser request...");
+var validRequest = new AddUserCommandRequest
+{
+    Name = "John Doe",
+    Email = "john.doe@example.com",
+    Age = 30
+};
+
+try
+{
+    var response = await client.AddUserAsync(validRequest);
+    Console.WriteLine($"✓ Success! User added with ID: {response.Result}");
+}
+catch (RpcException ex)
+{
+    Console.WriteLine($"✗ Unexpected error: {ex.Status.Detail}");
+}
+
+Console.WriteLine();
+
+// Test 2: Invalid email (empty)
+Console.WriteLine("Test 2: Invalid email (empty)...");
+var invalidEmailRequest = new AddUserCommandRequest
+{
+    Name = "Jane Doe",
+    Email = "",
+    Age = 25
+};
+
+try
+{
+    var response = await client.AddUserAsync(invalidEmailRequest);
+    Console.WriteLine($"✗ Unexpected success! Validation should have failed.");
+}
+catch (RpcException ex)
+{
+    Console.WriteLine($"✓ Validation caught! Status: {ex.StatusCode}");
+    Console.WriteLine($"  Message: {ex.Status.Detail}");
+}
+
+Console.WriteLine();
+
+// Test 3: Invalid email format
+Console.WriteLine("Test 3: Invalid email format...");
+var badEmailRequest = new AddUserCommandRequest
+{
+    Name = "Bob Smith",
+    Email = "not-an-email",
+    Age = 40
+};
+
+try
+{
+    var response = await client.AddUserAsync(badEmailRequest);
+    Console.WriteLine($"✗ Unexpected success! Validation should have failed.");
+}
+catch (RpcException ex)
+{
+    Console.WriteLine($"✓ Validation caught! Status: {ex.StatusCode}");
+    Console.WriteLine($"  Message: {ex.Status.Detail}");
+}
+
+Console.WriteLine();
+
+// Test 4: Invalid age (0)
+Console.WriteLine("Test 4: Invalid age (0)...");
+var invalidAgeRequest = new AddUserCommandRequest
+{
+    Name = "Alice Brown",
+    Email = "alice@example.com",
+    Age = 0
+};
+
+try
+{
+    var response = await client.AddUserAsync(invalidAgeRequest);
+    Console.WriteLine($"✗ Unexpected success! Validation should have failed.");
+}
+catch (RpcException ex)
+{
+    Console.WriteLine($"✓ Validation caught! Status: {ex.StatusCode}");
+    Console.WriteLine($"  Message: {ex.Status.Detail}");
+}
+
+Console.WriteLine();
+Console.WriteLine("All tests completed!");

TestGrpcClient/Protos/cqrs_services.proto

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+syntax = "proto3";
+
+option csharp_namespace = "Svrnty.CQRS.Grpc.Sample.Grpc";
+
+package cqrs;
+
+// Command service for CQRS operations
+service CommandService {
+  // Adds a new user and returns the user ID
+  rpc AddUser (AddUserCommandRequest) returns (AddUserCommandResponse);
+
+  // Removes a user
+  rpc RemoveUser (RemoveUserCommandRequest) returns (RemoveUserCommandResponse);
+}
+
+// Query service for CQRS operations
+service QueryService {
+  // Fetches a user by ID
+  rpc FetchUser (FetchUserQueryRequest) returns (FetchUserQueryResponse);
+}
+
+// Request message for adding a user
+message AddUserCommandRequest {
+  string name = 1;
+  string email = 2;
+  int32 age = 3;
+}
+
+// Response message containing the added user ID
+message AddUserCommandResponse {
+  int32 result = 1;
+}
+
+// Request message for removing a user
+message RemoveUserCommandRequest {
+  int32 user_id = 1;
+}
+
+// Response message for remove user (empty)
+message RemoveUserCommandResponse {
+}
+
+// Request message for fetching a user
+message FetchUserQueryRequest {
+  int32 user_id = 1;
+}
+
+// Response message containing the user
+message FetchUserQueryResponse {
+  User result = 1;
+}
+
+// User entity
+message User {
+  int32 id = 1;
+  string name = 2;
+  string email = 3;
+}

TestGrpcClient/TestGrpcClient.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Protobuf Include="Protos\*.proto" GrpcServices="Client" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Google.Protobuf" Version="3.33.0" />
+    <PackageReference Include="Grpc.Net.Client" Version="2.71.0" />
+    <PackageReference Include="Grpc.Tools" Version="2.76.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+</Project>