diff --git a/tests/test_config.py b/tests/test_config.py
index 8c20fc7..4bdb4e7 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -3,10 +3,14 @@ import unittest.mock as mock
 
 import pytest
 
+from heisskleber.config import BaseConf
 from heisskleber.config.parse import (
+    get_cmdline,
     get_config_dir,
     get_config_filepath,
+    load_config,
     read_yaml_config_file,
+    update_config,
 )
 
 
@@ -16,7 +20,7 @@ def test_get_config_dir():
 
 
 def test_get_config_filepath():
-    with mock.patch("os.path.isfile", return_value=True):
+    with mock.patch("os.path.isfile", return_value=True), mock.patch("os.path.isdir", return_value=True):
         assert get_config_filepath("test_config.yaml") == os.path.join(
             os.path.join(os.environ["HOME"], ".config"),
             "heisskleber",
@@ -37,10 +41,42 @@ def test_read_yaml_config_file():
 
 
 def test_update_config():
-    # TODO test update_config
-    pass
+    conf_obj = BaseConf()
+    conf_obj["verbose"] = False
+    conf_obj["print_stdout"] = False
+    conf_dict = {"verbose": True, "print_stdout": True}
+    conf_obj = update_config(conf_obj, conf_dict)
+
+    assert conf_obj.verbose is True
+    assert conf_obj.print_stdout is True
+
+
+def test_get_cmdline_patch_argv():
+    with mock.patch("sys.argv", ["test.py", "--verbose"]):
+        assert get_cmdline()["verbose"] is True
+
+
+def test_get_cmdline():
+    assert (
+        get_cmdline(
+            [
+                "--verbose",
+            ]
+        )["verbose"]
+        is True
+    )
+
+
+def test_load_config_from_file():
+    with mock.patch("heisskleber.config.parse.get_config_filepath", return_value="tests/config.yaml"):
+        conf = load_config(BaseConf(), "config", read_commandline=False)
+        assert conf.verbose is True
 
 
 def test_load_config():
-    # TODO test load_config
-    pass
+    with mock.patch("heisskleber.config.parse.get_config_filepath", return_value="tests/config.yaml"), mock.patch(
+        "sys.argv", ["test.py", "--print-stdout"]
+    ):
+        conf = load_config(BaseConf(), "config")
+        assert conf.verbose is True
+        assert conf.print_stdout is True