Replace shared email commands with MediatR notifications (#280)

web/backend/Features/Features.Emails.Tests/Notifications/UserRegisteredNotificationHandlerTests.cs

@@ -0,0 +1,63 @@
+using Features.Auth.Notifications;
+using Features.Emails.Notifications;
+using Features.Emails.Services;
+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Moq;
+
+namespace Features.Emails.Tests.Notifications;
+
+public class UserRegisteredNotificationHandlerTests
+{
+    [Fact]
+    public async Task Handle_DelegatesToEmailDispatcher()
+    {
+        Mock<IEmailDispatcher> dispatcherMock = new();
+        UserRegisteredNotificationHandler handler = new(
+            dispatcherMock.Object,
+            Mock.Of<ILogger<UserRegisteredNotificationHandler>>()
+        );
+        UserRegisteredNotification notification = new(
+            Guid.NewGuid(),
+            "Aaron",
+            "aaron@example.com",
+            "token-123"
+        );
+
+        await handler.Handle(notification, CancellationToken.None);
+
+        dispatcherMock.Verify(
+            d => d.SendRegistrationEmailAsync("Aaron", "aaron@example.com", "token-123"),
+            Times.Once
+        );
+    }
+
+    [Fact]
+    public async Task Handle_SwallowsDispatcherFailure()
+    {
+        Mock<IEmailDispatcher> dispatcherMock = new();
+        dispatcherMock
+            .Setup(d =>
+                d.SendRegistrationEmailAsync(
+                    It.IsAny<string>(),
+                    It.IsAny<string>(),
+                    It.IsAny<string>()
+                )
+            )
+            .ThrowsAsync(new Exception("smtp down"));
+        UserRegisteredNotificationHandler handler = new(
+            dispatcherMock.Object,
+            Mock.Of<ILogger<UserRegisteredNotificationHandler>>()
+        );
+        UserRegisteredNotification notification = new(
+            Guid.NewGuid(),
+            "Aaron",
+            "aaron@example.com",
+            "token-123"
+        );
+
+        Func<Task> act = async () => await handler.Handle(notification, CancellationToken.None);
+
+        await act.Should().NotThrowAsync();
+    }
+}