Implemented Core client

Cloudflare.Tests/Auth/ApiTokenAuthenticationTest.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Net.Http;
+using AMWD.Net.Api.Cloudflare.Auth;
+
+namespace Cloudflare.Core.Tests.Auth
+{
+	[TestClass]
+	public class ApiTokenAuthenticationTest
+	{
+		[TestMethod]
+		public void ShouldAddHeader()
+		{
+			// Arrange
+			string apiToken = "some-api-token";
+
+			var auth = new ApiTokenAuthentication(apiToken);
+			using var clt = new HttpClient();
+
+			// Act
+			auth.AddHeader(clt);
+
+			// Assert
+			Assert.IsTrue(clt.DefaultRequestHeaders.Contains("Authorization"));
+
+			Assert.AreEqual("Bearer", clt.DefaultRequestHeaders.Authorization.Scheme);
+			Assert.AreEqual(apiToken, clt.DefaultRequestHeaders.Authorization.Parameter);
+		}
+
+		[DataTestMethod]
+		[DataRow(null)]
+		[DataRow("")]
+		[DataRow("  ")]
+		[ExpectedException(typeof(ArgumentNullException))]
+		public void ShouldArgumentNullExceptionForEmailAddress(string apiToken)
+		{
+			// Arrange
+
+			// Act
+			new ApiTokenAuthentication(apiToken);
+
+			// Assert - ArgumentNullException
+		}
+	}
+}