Add user existence check to signup integration test (#221)

Author: hhvrc

API.IntegrationTests/AccountTests.cs

@@ -1,6 +1,9 @@
 using System.Net;
 using System.Text;
 using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using OpenShock.Common.OpenShockDb;
 
 namespace OpenShock.API.IntegrationTests;
 
@@ -25,5 +28,12 @@ public async Task CreateAccount_ShouldAdd_NewUserToDatabase()
         var content = await response.Content.ReadAsStringAsync();
 
         await Assert.That(response.StatusCode).IsEqualTo(HttpStatusCode.OK);
+
+        await using var scope = WebAppFactory.Services.CreateAsyncScope();
+        var db = scope.ServiceProvider.GetRequiredService<OpenShockContext>();
+
+        var user = await db.Users.FirstOrDefaultAsync(u => u.Email == "bob@example.com");
+
+        await Assert.That(user is not null).IsTrue();
     }
 }