tests: add tests for data client

src/tests/StevesBot.Webhook.Tests/Unit/YouTubeDataApiClientTests.cs

@@ -0,0 +1,81 @@
+using System.Text.Json;
+
+using Microsoft.Extensions.Options;
+
+namespace StevesBot.Webhook.Tests.Unit;
+
+public sealed class YouTubeDataApiClientTests : IDisposable
+{
+  private readonly MockHttpMessageHandler _mockHttpMessageHandler = new();
+  private readonly Mock<ILogger<YouTubeDataApiClient>> _mockLogger = new();
+  private readonly Mock<IOptions<YouTubeClientOptions>> _mockOptions = new();
+  private readonly YouTubeDataApiClient _sut;
+
+  public YouTubeDataApiClientTests()
+  {
+    var httpClient = _mockHttpMessageHandler.ToHttpClient();
+    httpClient.BaseAddress = new Uri("https://test.com");
+
+    _mockOptions
+      .Setup(static x => x.Value)
+      .Returns(new YouTubeClientOptions());
+
+    _sut = new(httpClient, _mockLogger.Object, _mockOptions.Object);
+  }
+
+  [Fact]
+  public async Task GetVideoByIdAsync_WhenRequestFails_ItShouldReturnNull()
+  {
+    _mockHttpMessageHandler
+      .When("*/videos")
+      .Respond(HttpStatusCode.InternalServerError);
+
+    var result = await _sut.GetVideoByIdAsync("video_id");
+
+    result.Should().BeNull();
+  }
+
+  [Fact]
+  public async Task GetVideoByIdAsync_WhenRequestSucceedsButItemsEmpty_ItShouldReturnNull()
+  {
+    var videosResponse = new YouTubeVideoListResponse();
+
+    _mockHttpMessageHandler
+      .When("*/videos")
+      .Respond(
+        HttpStatusCode.OK,
+        "application/json",
+        JsonSerializer.Serialize(videosResponse)
+      );
+
+    var result = await _sut.GetVideoByIdAsync("video_id", ["snippet"]);
+
+    result.Should().BeNull();
+  }
+
+  [Fact]
+  public async Task GetVideoByIdAsync_WhenRequestSucceedsAndVideoFound_ItShouldReturnVideo()
+  {
+    var videoId = "video_id";
+    var video = new YouTubeVideo() { Id = videoId };
+    var videosResponse = new YouTubeVideoListResponse() { Items = [video] };
+
+    _mockHttpMessageHandler
+      .When("*/videos")
+      .Respond(
+        HttpStatusCode.OK,
+        "application/json",
+        JsonSerializer.Serialize(videosResponse)
+      );
+
+    var result = await _sut.GetVideoByIdAsync(videoId);
+
+    result.Should().BeEquivalentTo(video);
+
+  }
+
+  public void Dispose()
+  {
+    _mockHttpMessageHandler.Dispose();
+  }
+}