diff --git a/.gitignore b/.gitignore
index 917675d..908095e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,8 +23,10 @@ pip-log.txt
 
 # Unit test / coverage reports
 .coverage
+htmlcov
 .tox
 nosetests.xml
+.cache
 
 # Translations
 *.mo
diff --git a/gooey/tests/argparse_to_json_unittest.py b/gooey/tests/argparse_to_json_unittest.py
index 71be3b6..9c6332d 100644
--- a/gooey/tests/argparse_to_json_unittest.py
+++ b/gooey/tests/argparse_to_json_unittest.py
@@ -158,6 +158,15 @@ def test_mutually(exclusive_group):
   assert target_arg.dest == data['display_name']
 
 
+def test_empty_mutex_group():
+  assert not build_radio_group(None)
+
+
+def test_as_json_invalid_widget():
+  with pytest.raises(UnknownWidgetType):
+    as_json(None, 'InvalidWidget', None)
+
+
 def get_action(parser, dest):
   for action in parser._actions:
     if action.dest == dest:
@@ -168,11 +177,3 @@ def find_arg_by_option(group, option_string):
   for arg in group:
     if option_string in arg.option_strings:
       return arg
-
-
-
-
-
-
-
-
diff --git a/gooey/tests/config_generator_unittest.py b/gooey/tests/config_generator_unittest.py
new file mode 100644
index 0000000..887de9f
--- /dev/null
+++ b/gooey/tests/config_generator_unittest.py
@@ -0,0 +1,20 @@
+import argparse
+import pytest
+from gooey.python_bindings.config_generator import *
+
+# TODO: duplicated from argparse_to_json_unittest, should go into conftest.py
+@pytest.fixture
+def empty_parser():
+  return argparse.ArgumentParser(description='description')
+
+
+def test_create_from_parser(empty_parser):
+  build_spec = create_from_parser(empty_parser,'.')
+  assert build_spec['manual_start'] == True
+
+
+def test_create_from_parser_show_config(empty_parser):
+  build_spec = create_from_parser(empty_parser,
+                                  '.',
+                                  show_config=True)
+  assert build_spec['program_description'] == 'description'