Add unit tests

Author: emmyzhou-db

databricks-sdk-java/src/test/java/com/databricks/sdk/core/oauth/IDTokenTest.java

@@ -0,0 +1,15 @@
+package com.databricks.sdk.core.oauth;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+
+public class IDTokenTest {
+
+    private static final String accessToken = "testIdToken";
+
+    @Test
+    void createIDToken() {
+        IDToken idToken = new IDToken(accessToken);
+        assertEquals(accessToken, idToken.getValue());
+    }
+}