diff --git a/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/AuthenticationProviderFactorySuite.scala b/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/AuthenticationProviderFactorySuite.scala
index 197df02e6..fae185b38 100644
--- a/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/AuthenticationProviderFactorySuite.scala
+++ b/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/AuthenticationProviderFactorySuite.scala
@@ -31,6 +31,10 @@ class AuthenticationProviderFactorySuite extends SparkFunSuite {
     val ldap = AuthenticationProviderFactory.getAuthenticationProvider(AuthMethods.LDAP, conf)
     val exception = intercept[AuthenticationException](ldap.authenticate("test", "test"))
     assert(exception.getMessage.contains("Error validating LDAP user:"))
+
+    val e2 = intercept[AuthenticationException](
+      AuthenticationProviderFactory.getAuthenticationProvider(null, conf))
+    assert(e2.getMessage === "Not a valid authentication method")
   }
 
 }
diff --git a/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/KyuubiAuthFactorySuite.scala b/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/KyuubiAuthFactorySuite.scala
index f9c4b2c81..b128c171d 100644
--- a/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/KyuubiAuthFactorySuite.scala
+++ b/kyuubi-server/src/test/scala/yaooqinn/kyuubi/auth/KyuubiAuthFactorySuite.scala
@@ -25,7 +25,6 @@ import org.apache.hadoop.security.authorize.AuthorizationException
 import org.apache.spark.{KyuubiConf, KyuubiSparkUtil, SparkConf, SparkFunSuite}
 
 import yaooqinn.kyuubi.KyuubiSQLException
-import yaooqinn.kyuubi.server.KyuubiServer
 import yaooqinn.kyuubi.service.ServiceException
 import yaooqinn.kyuubi.utils.ReflectUtils
 
@@ -81,6 +80,13 @@ class KyuubiAuthFactorySuite extends SparkFunSuite {
     assert(e.getMessage === "Unsupported authentication method: OTHER")
   }
 
+  test("AuthType LDAP") {
+    val conf = new SparkConf(true).set(KyuubiConf.AUTHENTICATION_METHOD.key, "LDAP")
+    KyuubiSparkUtil.setupCommonConfig(conf)
+    val authFactory = new KyuubiAuthFactory(conf)
+    assert(authFactory.getIpAddress.isEmpty)
+  }
+
   test("AuthType KERBEROS without keytab/principal") {
     val conf = new SparkConf(true).set(KyuubiConf.AUTHENTICATION_METHOD.key, "KERBEROS")
     KyuubiSparkUtil.setupCommonConfig(conf)