Add Token Unit Test

src/PDNDClientAssertionGenerator.Tests/TokenUtilsTests.cs

@@ -0,0 +1,62 @@
+// (c) 2024 Francesco Del Re <francesco.delre.87@gmail.com>
+// This code is licensed under MIT license (see LICENSE.txt for details)
+using PDNDClientAssertionGenerator.Utils;
+
+namespace PDNDClientAssertionGenerator.Tests
+{
+    public class TokenUtilsTests
+    {
+        [Fact]
+        public void ExtractAccessToken_ShouldReturnAccessToken_WhenValidJsonResponseIsProvided()
+        {
+            // Arrange
+            string jsonResponse = "{\"access_token\": \"abc123\", \"expires_in\": 3600}";
+            string expectedAccessToken = "abc123";
+
+            // Act
+            string actualAccessToken = TokenUtils.ExtractAccessToken(jsonResponse);
+
+            // Assert
+            Assert.Equal(expectedAccessToken, actualAccessToken);
+        }
+
+        [Fact]
+        public void ExtractAccessToken_ShouldReturnEmptyString_WhenAccessTokenIsMissing()
+        {
+            // Arrange
+            string jsonResponse = "{\"expires_in\": 3600}";
+
+            // Act
+            string actualAccessToken = TokenUtils.ExtractAccessToken(jsonResponse);
+
+            // Assert
+            Assert.Equal(string.Empty, actualAccessToken);
+        }
+
+        [Fact]
+        public void ExtractAccessToken_ShouldReturnEmptyString_WhenJsonIsInvalid()
+        {
+            // Arrange
+            string invalidJsonResponse = "{\"access_token\": \"abc123\", \"expires_in\": }"; // Invalid JSON
+
+            // Act
+            string actualAccessToken = TokenUtils.ExtractAccessToken(invalidJsonResponse);
+
+            // Assert
+            Assert.Equal(string.Empty, actualAccessToken);
+        }
+
+        [Fact]
+        public void ExtractAccessToken_ShouldReturnEmptyString_WhenAccessTokenIsNull()
+        {
+            // Arrange
+            string jsonResponse = "{\"access_token\": null}";
+
+            // Act
+            string actualAccessToken = TokenUtils.ExtractAccessToken(jsonResponse);
+
+            // Assert
+            Assert.Equal(string.Empty, actualAccessToken);
+        }
+    }
+}