diff --git a/src/tests/StevesBot.Webhook.Tests/Unit/PubSubClientTests.cs b/src/tests/StevesBot.Webhook.Tests/Unit/PubSubClientTests.cs
new file mode 100644
index 0000000..f00bac1
--- /dev/null
+++ b/src/tests/StevesBot.Webhook.Tests/Unit/PubSubClientTests.cs
@@ -0,0 +1,36 @@
+
+namespace StevesBot.Webhook.Tests.Unit;
+
+public sealed class PubSubClientTests : IDisposable
+{
+  private readonly MockHttpMessageHandler _mockHttpMessageHandler = new();
+  private readonly Mock<ILogger<PubSubClient>> _mockLogger = new();
+  private readonly PubSubClient _sut;
+
+  public PubSubClientTests()
+  {
+    var mockHttpClient = _mockHttpMessageHandler.ToHttpClient();
+    mockHttpClient.BaseAddress = new("https://test.com");
+
+    _sut = new(mockHttpClient, _mockLogger.Object);
+  }
+
+  [Theory]
+  [InlineData(HttpStatusCode.InternalServerError, false)]
+  [InlineData(HttpStatusCode.OK, true)]
+  public async Task SubscribeAsync_WhenCalled_ItShouldReturnExpectedResult(HttpStatusCode givenStatusCode, bool expectedResult)
+  {
+    _mockHttpMessageHandler
+      .When("*/subscribe")
+      .Respond(givenStatusCode);
+
+    var result = await _sut.SubscribeAsync("callbackUrl", "topicUrl");
+
+    result.Should().Be(expectedResult);
+  }
+
+  public void Dispose()
+  {
+    _mockHttpMessageHandler.Dispose();
+  }
+}
\ No newline at end of file
diff --git a/src/tests/StevesBot.Webhook.Tests/Unit/YouTubePageInfoTests.cs b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubePageInfoTests.cs
new file mode 100644
index 0000000..10ea56c
--- /dev/null
+++ b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubePageInfoTests.cs
@@ -0,0 +1,6 @@
+namespace StevesBot.Webhook.Tests.Unit;
+
+public class YouTubePageInfoTests
+{
+
+}
\ No newline at end of file
diff --git a/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeSnippetTests.cs b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeSnippetTests.cs
new file mode 100644
index 0000000..1e2a061
--- /dev/null
+++ b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeSnippetTests.cs
@@ -0,0 +1,25 @@
+namespace StevesBot.Webhook.Tests.Unit;
+
+public class YouTubeSnippetTests
+{
+  [Fact]
+  public void Constructor_WhenCalled_ItShouldReturnAnInstance()
+  {
+    var result = new YouTubeSnippet();
+
+    result.LiveBroadcastContent.Should().BeEmpty();
+  }
+
+  [Fact]
+  public void Constructor_WhenCalledWithValues_ItShouldReturnAnInstance()
+  {
+    var content = "live";
+
+    var result = new YouTubeSnippet()
+    {
+      LiveBroadcastContent = content,
+    };
+
+    result.LiveBroadcastContent.Should().Be(content);
+  }
+}
\ No newline at end of file
diff --git a/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeVideoListResponseTests.cs b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeVideoListResponseTests.cs
new file mode 100644
index 0000000..2bf7ea3
--- /dev/null
+++ b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeVideoListResponseTests.cs
@@ -0,0 +1,31 @@
+using StevesBot.Webhook.YouTube.Data;
+
+namespace StevesBot.Webhook.Tests.Unit;
+
+public class YouTubeVideoListResponseTests
+{
+  [Fact]
+  public void Constructor_WhenCalled_ItShouldReturnAnInstance()
+  {
+    var result = new YouTubeVideoListResponse();
+
+    result.Items.Should().BeEmpty();
+    result.PageInfo.Should().BeEquivalentTo(new YouTubePageInfo());
+  }
+
+  [Fact]
+  public void Constructor_WhenCalledWithValues_ItShouldReturnAnInstance()
+  {
+    var videos = new YouTubeVideo[] { new() };
+    var pageInfo = new YouTubePageInfo();
+
+    var result = new YouTubeVideoListResponse()
+    {
+      Items = videos,
+      PageInfo = pageInfo,
+    };
+
+    result.Items.Should().BeSameAs(videos);
+    result.PageInfo.Should().BeSameAs(pageInfo);
+  }
+}
\ No newline at end of file
diff --git a/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeVideoTests.cs b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeVideoTests.cs
new file mode 100644
index 0000000..128d5fd
--- /dev/null
+++ b/src/tests/StevesBot.Webhook.Tests/Unit/YouTubeVideoTests.cs
@@ -0,0 +1,68 @@
+namespace StevesBot.Webhook.Tests.Unit;
+
+public class YouTubeVideoTests
+{
+  [Fact]
+  public void Constructor_WhenCalled_ItShouldReturnAnInstance()
+  {
+    var result = new YouTubeVideo();
+
+    result.Id.Should().BeEmpty();
+    result.LiveStreamingDetails.Should().BeNull();
+    result.Snippet.Should().BeEquivalentTo(new YouTubeSnippet());
+  }
+
+  [Fact]
+  public void Constructor_WhenCalledWithValues_ItShouldReturnAnInstance()
+  {
+    var id = "id";
+    var details = new YouTubeLiveStreamingDetails();
+    var snippet = new YouTubeSnippet();
+
+    var result = new YouTubeVideo()
+    {
+      Id = id,
+      LiveStreamingDetails = details,
+      Snippet = snippet,
+    };
+
+    result.Id.Should().Be(id);
+    result.LiveStreamingDetails.Should().BeSameAs(details);
+    result.Snippet.Should().BeSameAs(snippet);
+  }
+
+  [Fact]
+  public void IsLiveStream_WhenLiveStreamingDetailsIsNull_ItShouldReturnFalse()
+  {
+    var video = new YouTubeVideo()
+    {
+      Snippet = new() { LiveBroadcastContent = "live" },
+    };
+
+    video.IsLiveStream.Should().BeFalse();
+  }
+
+  [Fact]
+  public void IsLiveStream_WhenSnippetLiveBroadcastContentIsNotLive_ItShouldReturnFalse()
+  {
+    var video = new YouTubeVideo()
+    {
+      LiveStreamingDetails = new(),
+      Snippet = new() { LiveBroadcastContent = "none" },
+    };
+
+    video.IsLiveStream.Should().BeFalse();
+  }
+
+  [Fact]
+  public void IsLiveStream_WhenDetailsIsNotNullAndContentIsLive_ItShouldReturnTrue()
+  {
+    var video = new YouTubeVideo()
+    {
+      LiveStreamingDetails = new(),
+      Snippet = new() { LiveBroadcastContent = "live" },
+    };
+
+    video.IsLiveStream.Should().BeTrue();
+  }
+}
\ No newline at end of file
diff --git a/src/tests/StevesBot.Webhook.Tests/Usings.cs b/src/tests/StevesBot.Webhook.Tests/Usings.cs
index 4617e08..aadd939 100644
--- a/src/tests/StevesBot.Webhook.Tests/Usings.cs
+++ b/src/tests/StevesBot.Webhook.Tests/Usings.cs
@@ -1,2 +1,11 @@
+global using System.Net;
+
+global using Microsoft.Extensions.Logging;
+
+global using Moq;
+
+global using RichardSzalay.MockHttp;
+
 global using StevesBot.Webhook.YouTube;
-global using StevesBot.Webhook.YouTube.Tasks;
\ No newline at end of file
+global using StevesBot.Webhook.YouTube.Data;
+global using StevesBot.Webhook.YouTube.Tasks;