TST: Unittest for config timeout option support of tuples and None

unittests/test_configs/pylinkahead-timeout1.ini

+[Connection]
+url=https://localhost:10443/
+password_method = unauthenticated
+timeout = None

unittests/test_configs/pylinkahead-timeout2.ini

+[Connection]
+url=https://localhost:10443/
+password_method = unauthenticated
+timeout = (1,20)

unittests/test_configuration.py

@@ -24,6 +24,7 @@
 
 from os import environ, getcwd, remove
 from os.path import expanduser, isfile, join
+from pathlib import Path
 
 import linkahead as db
 import pytest
@@ -66,3 +67,18 @@ def test_config_ini_via_envvar(temp_ini_files):
     assert expanduser("~/.pylinkahead.ini") in db.configuration._read_config_files()
     # test configuration file in cwd
     assert join(getcwd(), "pylinkahead.ini") in db.configuration._read_config_files()
+
+
+def test_config_timeout_option():
+    expected_results = [None, (1, 20)]
+    # Iterate through timeout test configs
+    test_configs = Path(__file__).parent/'test_configs'
+    for test_config in test_configs.rglob('pylinkahead-timeout*.ini'):
+        # Test that test configs can be parsed
+        db.configure(str(test_config))
+        dct = db.configuration.config_to_yaml(db.get_config())
+        # Test that resulting dict has correct content for timeout
+        assert 'Connection' in dct
+        assert 'timeout' in dct['Connection']
+        assert dct['Connection']['timeout'] in expected_results
+        expected_results.remove(dct['Connection']['timeout'])