Added basic WhatsApp implementation

test/LinkMobility.Tests/WhatsApp/Contents/AudioMessageContentTest.cs

@@ -0,0 +1,43 @@
+using AMWD.Net.Api.LinkMobility.WhatsApp;
+
+namespace LinkMobility.Tests.WhatsApp.Contents
+{
+	[TestClass]
+	public class AudioMessageContentTest
+	{
+		[TestMethod]
+		[DataRow(null)]
+		[DataRow("")]
+		[DataRow("Caption")]
+		public void ShouldValidateSuccessful(string caption)
+		{
+			// Arrange
+			var content = new AudioMessageContent("https://example.com/audio.mp3");
+			content.Body.Caption = caption;
+
+			// Act
+			bool isValid = content.IsValid();
+
+			// Assert
+			Assert.IsTrue(isValid);
+		}
+
+		[TestMethod]
+		[DataRow(null)]
+		[DataRow("")]
+		[DataRow("   ")]
+		[DataRow("ftp://example.com/audio.mp3")]
+		[DataRow("www.example.org/audio.mp3")]
+		public void ShouldValidateNotSuccessful(string url)
+		{
+			// Arrange
+			var content = new AudioMessageContent(url);
+
+			// Act
+			bool isValid = content.IsValid();
+
+			// Assert
+			Assert.IsFalse(isValid);
+		}
+	}
+}