added unit tests and made keyword arguments more consistent

setup.py

@@ -30,6 +30,15 @@ setup(
     'requests >= 2.27.0',
     'beautifulsoup4 >= 4.10.0',
     'pandas >= 1.4.0'],
+  extras_require = {
+    'docs': [
+      'sphinx >= 3.3.1',
+      'sphinx_rtd_theme >= 0.5',],
+    'tests': [
+      'pytest >= 6.1.2',
+      'pytest-cov >= 2.10.1',
+      'pytest-html >= 3.0.0',
+      'pytest-metadata >= 1.10.0']},
   include_package_data = True,
   zip_safe = False )