Unit test case fixed

Author: Amit-CloudSufi

src/main/java/io/cdap/plugin/http/common/BaseHttpConfig.java

@@ -457,12 +457,8 @@ private void validateOAuth2Fields(FailureCollector failureCollector) {
             assertIsSetWithFailureCollector(getOauth2ClientAuthentication(),
                 PROPERTY_OAUTH2_CLIENT_AUTHENTICATION, reasonOauth2GrantType, failureCollector);
         }
-        // in case of refresh token grant type, also check 2 additional fields
+        // in case of refresh token grant type, also check additional fields
         if (OAuthGrantType.REFRESH_TOKEN.equals(getOauth2GrantType())) {
-            if (!containsMacro(PROPERTY_AUTH_URL)) {
-                assertIsSetWithFailureCollector(getAuthUrl(), PROPERTY_AUTH_URL,
-                    reasonOauth2GrantType, failureCollector);
-            }
             if (!containsMacro(PROPERTY_REFRESH_TOKEN)) {
                 assertIsSetWithFailureCollector(getRefreshToken(), PROPERTY_REFRESH_TOKEN,
                     reasonOauth2GrantType, failureCollector);