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test/LinkMobility.Tests/Auth/AccessTokenAuthenticationTest.cs

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+using System.Net.Http;
+using AMWD.Net.Api.LinkMobility;
+
+namespace LinkMobility.Tests.Auth
+{
+	[TestClass]
+	public class AccessTokenAuthenticationTest
+	{
+		[TestMethod]
+		public void ShouldAddHeader()
+		{
+			// Arrange
+			string token = "test_token";
+			var auth = new AccessTokenAuthentication(token);
+
+			using var httpClient = new HttpClient();
+
+			// Act
+			auth.AddHeader(httpClient);
+
+			// Assert
+			Assert.IsTrue(httpClient.DefaultRequestHeaders.Contains("Authorization"));
+
+			Assert.AreEqual("Bearer", httpClient.DefaultRequestHeaders.Authorization.Scheme);
+			Assert.AreEqual(token, httpClient.DefaultRequestHeaders.Authorization.Parameter);
+		}
+
+		[TestMethod]
+		[DataRow(null)]
+		[DataRow("")]
+		[DataRow("   ")]
+		public void ShouldThrowArgumentNullExceptionForToken(string token)
+		{
+			// Arrange
+
+			// Act & Assert
+			Assert.ThrowsExactly<ArgumentNullException>(() => new AccessTokenAuthentication(token));
+		}
+	}
+}