Add integration and unit tests for Notes API with PostgreSQL-based test hosting configuration

Freman.Sample.Web.IntegrationTests/Api/NotesApiTests.cs

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+using System.Net;
+using System.Net.Http.Json;
+using Freman.Sample.Web.Contracts;
+using Shouldly;
+using Freman.Sample.Web.IntegrationTests.TestHost;
+
+namespace Freman.Sample.Web.IntegrationTests.Api;
+
+[Collection(IntegrationTestCollection.Name)]
+public class NotesApiTests(IntegrationTestFixture fixture) : IAsyncLifetime
+{
+    private readonly HttpClient _client = fixture.Factory.CreateClient();
+
+    public async ValueTask InitializeAsync()
+    {
+        await fixture.ResetDatabaseAsync();
+    }
+
+    public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+
+    [Fact]
+    public async Task GetNotes_InitiallyEmpty_Returns200AndEmptyList()
+    {
+        var resp = await _client.GetAsync("/api/notes", TestContext.Current.CancellationToken);
+        resp.StatusCode.ShouldBe(HttpStatusCode.OK);
+
+        var notes = await resp.Content.ReadFromJsonAsync<List<NoteDto>>(cancellationToken: TestContext.Current.CancellationToken);
+        notes.ShouldNotBeNull();
+        notes!.Count.ShouldBe(0);
+    }
+
+    [Fact]
+    public async Task PostNote_ThenGetNotes_ReturnsTheNewNote()
+    {
+        var uniqueText = $"test note {Guid.NewGuid():N}";
+
+        var post = await _client.PostAsJsonAsync("/api/notes",
+            new CreateNoteRequest { Text = uniqueText },
+            cancellationToken: TestContext.Current.CancellationToken);
+
+        post.StatusCode.ShouldBe(HttpStatusCode.Created);
+
+        var notes = await _client.GetFromJsonAsync<List<NoteDto>>("/api/notes", cancellationToken: TestContext.Current.CancellationToken);
+        notes.ShouldNotBeNull();
+        notes!.Any(n => n.Text == uniqueText).ShouldBeTrue();
+    }
+
+    [Fact]
+    public async Task DeleteNote_RemovesIt()
+    {
+        var post = await _client.PostAsJsonAsync("/api/notes", new CreateNoteRequest { Text = "delete me" },
+            cancellationToken: TestContext.Current.CancellationToken);
+        var created = await post.Content.ReadFromJsonAsync<NoteDto>(cancellationToken: TestContext.Current.CancellationToken);
+        created.ShouldNotBeNull();
+
+        var del = await _client.DeleteAsync($"/api/notes/{created!.Id}", TestContext.Current.CancellationToken);
+        del.StatusCode.ShouldBe(HttpStatusCode.NoContent);
+
+        var notes = await _client.GetFromJsonAsync<List<NoteDto>>("/api/notes", cancellationToken: TestContext.Current.CancellationToken);
+        notes.ShouldNotBeNull();
+        notes!.Any(n => n.Id == created.Id).ShouldBeFalse();
+    }
+
+    [Fact]
+    public async Task DeleteMissingNote_Returns404()
+    {
+        var del = await _client.DeleteAsync("/api/notes/123456", TestContext.Current.CancellationToken);
+        del.StatusCode.ShouldBe(HttpStatusCode.NotFound);
+    }
+}