ConfigFileNotFound exception + run-test script

Signed-off-by: Václav Valíček <valicek1994@gmail.com>

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"