diff --git a/old/checker/run-checker b/old/checker/run-checker
index dc236dd..cb41281 100755
--- a/old/checker/run-checker
+++ b/old/checker/run-checker
@@ -5,7 +5,7 @@ IFS=$'\n\t'
 # source libs
 mydir=$(dirname $(realpath $0))
 source $mydir/cloner-lib-general
-source $mydir/cloner-lib-auth
+
 source $mydir/cloner-lib-cfg
 source $mydir/detector-lib-cfg
 
diff --git a/repo_cloner/lib/config_file_not_found_error.py b/repo_cloner/lib/config_file_not_found_error.py
new file mode 100644
index 0000000..f0bbb8d
--- /dev/null
+++ b/repo_cloner/lib/config_file_not_found_error.py
@@ -0,0 +1,20 @@
+from pathlib import PosixPath
+import os
+
+
+class ConfigFileNotFoundError(OSError):
+
+	def __str__(self):
+		if len(self.args) == 2:
+			path: str = ""
+			filename: str = ""
+			if isinstance(self.args[0], PosixPath):
+				path = str(PosixPath(self.args[0]))
+			else:
+				path = str(self.args[0])
+
+			filename = str(self.args[1])
+			path = os.path.join(path, filename)
+			return f"Config file does not exist: {path}"
+		else:
+			return super.__str__(self)
diff --git a/run-test b/run-test
new file mode 100755
index 0000000..39e10d8
--- /dev/null
+++ b/run-test
@@ -0,0 +1,19 @@
+#!/bin/bash
+set -euo pipefail
+
+if [ $# -eq 0 ]
+then
+	python3 -m pytest . \
+	 -v \
+	-n auto \
+	--ignore=tests/_support_data \
+	--color=yes \
+	--cov . \
+	--cov-config .coveragerc \
+	--cov-report term-missing \
+	--cov-report html \
+	--capture=no
+else
+	python3 -m pytest --capture=no $1
+fi
+
diff --git a/tests/lib/test_config_file_not_found.py b/tests/lib/test_config_file_not_found.py
new file mode 100644
index 0000000..fab505b
--- /dev/null
+++ b/tests/lib/test_config_file_not_found.py
@@ -0,0 +1,31 @@
+from repo_cloner.lib.config_file_not_found_error import ConfigFileNotFoundError
+from pathlib import PosixPath
+
+
+def test_type():
+	x = ConfigFileNotFoundError()
+	assert isinstance(x, ConfigFileNotFoundError)
+
+
+def test_return():
+	x = ConfigFileNotFoundError("/tmp", "cloner.cfg")
+	s = x.__str__()
+	assert s == "Config file does not exist: /tmp/cloner.cfg"
+
+
+def test_str_single_arg():
+	x = ConfigFileNotFoundError("/tmp")
+	s = x.__str__()
+	assert s == "ConfigFileNotFoundError('/tmp')"
+
+
+def test_return_empty():
+	x = ConfigFileNotFoundError()
+	s = x.__str__()
+	assert s == "ConfigFileNotFoundError()"
+
+
+def test_posix_path():
+	d = PosixPath("/nonexistent")
+	x = ConfigFileNotFoundError(d, "config.cfg")
+	assert x.__str__() == "Config file does not exist: /nonexistent/config.cfg"