diff --git a/hm_pyhelper/tests/test_miner_param.py b/hm_pyhelper/tests/test_miner_param.py
index 486c179..7b59a6e 100644
--- a/hm_pyhelper/tests/test_miner_param.py
+++ b/hm_pyhelper/tests/test_miner_param.py
@@ -315,6 +315,16 @@ def test_get_ecc_key_missing(self):
         with self.assertRaises(UnknownVariantAttributeException):
             get_ecc_location()
 
+    @patch.dict('os.environ', {"VARIANT": "MISSING"})
+    def test_get_onboarding_key_missing_variant(self):
+        with self.assertRaises(UnknownVariantException):
+            get_onboarding_location()
+
+    @patch.dict('os.environ', {"VARIANT": "MISSING"})
+    def test_get_ecc_key_missing_variant(self):
+        with self.assertRaises(UnknownVariantException):
+            get_ecc_location()
+
     @patch('hm_pyhelper.miner_param.get_gateway_mfr_command',
            return_value=['gateway_mfr', 'arg1', 'arg2'])
     @patch('subprocess.run', side_effect=FileNotFoundError())