feat: create chat message

tests/AnthropicClient.Tests/EndToEnd/ClientTests.cs

@@ -0,0 +1,21 @@
+namespace AnthropicClient.Tests.EndToEnd;
+
+public class ClientTests(
+  HttpClientFixture httpClientFixture,
+  ConfigurationFixture configFixture
+) : EndToEndTest(httpClientFixture, configFixture)
+{
+  [Fact]
+  public async Task CreateChatMessage_WhenCalled_ShouldReturnChatResponse()
+  {
+    var request = new ChatMessageRequest(
+      model: AnthropicModels.Claude3Haiku,
+      messages: [new(MessageRole.User, [new TextContent("Hello!")])]
+    );
+
+    var result = await _client.CreateChatMessageAsync(request);
+
+    result.IsSuccess.Should().BeTrue();
+    result.Value.Should().BeOfType<ChatResponse>();
+  }
+}

tests/AnthropicClient.Tests/EndToEnd/ConfigurationFixture.cs

@@ -0,0 +1,23 @@
+namespace AnthropicClient.Tests.EndToEnd;
+
+public class ConfigurationFixture
+{
+  public string AnthropicApiKey { get; }
+
+  public ConfigurationFixture()
+  {
+    var configuration = new ConfigurationBuilder()
+      .AddJsonFile("appsettings.Test.json")
+      .AddEnvironmentVariables()
+      .Build();
+
+    var anthropicApiKey = configuration["AnthropicApiKey"];
+
+    if (string.IsNullOrEmpty(anthropicApiKey))
+    {
+      throw new InvalidOperationException("AnthropicApiKey is required");
+    }
+
+    AnthropicApiKey = anthropicApiKey;
+  }
+}

tests/AnthropicClient.Tests/EndToEnd/EndToEndTest.cs

@@ -0,0 +1,9 @@
+namespace AnthropicClient.Tests.EndToEnd;
+
+public class EndToEndTest(
+  HttpClientFixture httpClientFixture,
+  ConfigurationFixture configFixture
+) : IClassFixture<HttpClientFixture>, IClassFixture<ConfigurationFixture>
+{
+  protected readonly Client _client = new(configFixture.AnthropicApiKey, httpClientFixture.HttpClient);
+}

tests/AnthropicClient.Tests/EndToEnd/HttpClientFixture.cs

@@ -0,0 +1,11 @@
+namespace AnthropicClient.Tests.EndToEnd;
+
+public class HttpClientFixture
+{
+  public HttpClient HttpClient { get; }
+
+  public HttpClientFixture()
+  {
+    HttpClient = new HttpClient();
+  }
+}