Added Support for OAuth

CHANGELOG.md

@@ -6,6 +6,9 @@
      - Automatic TOTP token generation from Base32-encoded MFA secrets using Otp.NET library
      - Comprehensive test coverage for MFA functionality including unit and integration tests
      - Supports both explicit token and MFA secret-based authentication flows
+   - Added Support for OAuth
+    - Added Comprehensive test coverage for OAuth Functionality in Unit Test cases.
+    - Supports both Login with and without OAuth Flows 
 
 ## [v0.3.2](https://github.com/contentstack/contentstack-management-dotnet/tree/v0.3.2)
  - Fix

Contentstack.Management.Core.Unit.Tests/OAuth/OAuthExceptionTest.cs

@@ -0,0 +1,212 @@
+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Contentstack.Management.Core.Exceptions;
+
+namespace Contentstack.Management.Core.Unit.Tests.OAuth
+{
+    [TestClass]
+    public class OAuthExceptionTest
+    {
+        [TestMethod]
+        public void OAuthException_DefaultConstructor_ShouldUseDefaultMessage()
+        {
+
+            var exception = new OAuthException();
+            Assert.AreEqual("OAuth operation failed.", exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthException_WithMessage_ShouldUseProvidedMessage()
+        {
+
+            var message = "Custom OAuth error message";
+            var exception = new OAuthException(message);
+            Assert.AreEqual(message, exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthException_WithMessageAndInnerException_ShouldUseBoth()
+        {
+
+            var message = "Custom OAuth error message";
+            var innerException = new InvalidOperationException("Inner exception");
+            var exception = new OAuthException(message, innerException);
+            Assert.AreEqual(message, exception.Message);
+            Assert.AreEqual(innerException, exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthConfigurationException_DefaultConstructor_ShouldUseDefaultMessage()
+        {
+
+            var exception = new OAuthConfigurationException();
+            Assert.AreEqual("OAuth configuration is invalid.", exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthConfigurationException_WithMessage_ShouldUseProvidedMessage()
+        {
+
+            var message = "Custom configuration error message";
+            var exception = new OAuthConfigurationException(message);
+            Assert.AreEqual(message, exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthConfigurationException_WithMessageAndInnerException_ShouldUseBoth()
+        {
+
+            var message = "Custom configuration error message";
+            var innerException = new ArgumentException("Inner exception");
+            var exception = new OAuthConfigurationException(message, innerException);
+            Assert.AreEqual(message, exception.Message);
+            Assert.AreEqual(innerException, exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthTokenException_DefaultConstructor_ShouldUseDefaultMessage()
+        {
+
+            var exception = new OAuthTokenException();
+            Assert.AreEqual("OAuth token operation failed.", exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthTokenException_WithMessage_ShouldUseProvidedMessage()
+        {
+
+            var message = "Custom token error message";
+            var exception = new OAuthTokenException(message);
+            Assert.AreEqual(message, exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthTokenException_WithMessageAndInnerException_ShouldUseBoth()
+        {
+
+            var message = "Custom token error message";
+            var innerException = new InvalidOperationException("Inner exception");
+            var exception = new OAuthTokenException(message, innerException);
+            Assert.AreEqual(message, exception.Message);
+            Assert.AreEqual(innerException, exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthAuthorizationException_DefaultConstructor_ShouldUseDefaultMessage()
+        {
+
+            var exception = new OAuthAuthorizationException();
+            Assert.AreEqual("OAuth authorization failed.", exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthAuthorizationException_WithMessage_ShouldUseProvidedMessage()
+        {
+
+            var message = "Custom authorization error message";
+            var exception = new OAuthAuthorizationException(message);
+            Assert.AreEqual(message, exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthAuthorizationException_WithMessageAndInnerException_ShouldUseBoth()
+        {
+
+            var message = "Custom authorization error message";
+            var innerException = new InvalidOperationException("Inner exception");
+            var exception = new OAuthAuthorizationException(message, innerException);
+            Assert.AreEqual(message, exception.Message);
+            Assert.AreEqual(innerException, exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthTokenRefreshException_DefaultConstructor_ShouldUseDefaultMessage()
+        {
+
+            var exception = new OAuthTokenRefreshException();
+            Assert.AreEqual("OAuth token refresh failed.", exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthTokenRefreshException_WithMessage_ShouldUseProvidedMessage()
+        {
+
+            var message = "Custom refresh error message";
+            var exception = new OAuthTokenRefreshException(message);
+            Assert.AreEqual(message, exception.Message);
+            Assert.IsNull(exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthTokenRefreshException_WithMessageAndInnerException_ShouldUseBoth()
+        {
+
+            var message = "Custom refresh error message";
+            var innerException = new InvalidOperationException("Inner exception");
+            var exception = new OAuthTokenRefreshException(message, innerException);
+            Assert.AreEqual(message, exception.Message);
+            Assert.AreEqual(innerException, exception.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthException_Inheritance_ShouldBeCorrect()
+        {
+
+            var oauthException = new OAuthException();
+            var configException = new OAuthConfigurationException();
+            var tokenException = new OAuthTokenException();
+            var authException = new OAuthAuthorizationException();
+            var refreshException = new OAuthTokenRefreshException();
+            Assert.IsInstanceOfType(oauthException, typeof(Exception));
+            Assert.IsInstanceOfType(configException, typeof(OAuthException));
+            Assert.IsInstanceOfType(tokenException, typeof(OAuthException));
+            Assert.IsInstanceOfType(authException, typeof(OAuthException));
+            Assert.IsInstanceOfType(refreshException, typeof(OAuthTokenException));
+        }
+
+        [TestMethod]
+        public void OAuthException_Serialization_ShouldWork()
+        {
+
+            var originalException = new OAuthException("Test message", new InvalidOperationException("Inner"));
+            Assert.IsNotNull(originalException);
+            Assert.AreEqual("Test message", originalException.Message);
+            Assert.IsNotNull(originalException.InnerException);
+        }
+
+        [TestMethod]
+        public void OAuthException_ToString_ShouldIncludeMessage()
+        {
+
+            var message = "Test OAuth error message";
+            var exception = new OAuthException(message);
+            var result = exception.ToString();
+            Assert.IsTrue(result.Contains(message));
+            Assert.IsTrue(result.Contains("OAuthException"));
+        }
+
+        [TestMethod]
+        public void OAuthException_WithInnerException_ToString_ShouldIncludeBoth()
+        {
+
+            var message = "Test OAuth error message";
+            var innerMessage = "Inner exception message";
+            var innerException = new InvalidOperationException(innerMessage);
+            var exception = new OAuthException(message, innerException);
+            var result = exception.ToString();
+            Assert.IsTrue(result.Contains(message));
+            Assert.IsTrue(result.Contains(innerMessage));
+            Assert.IsTrue(result.Contains("OAuthException"));
+            Assert.IsTrue(result.Contains("InvalidOperationException"));
+        }
+    }
+}