Raise an error with a useful message if the app is not setup.

flask_autodoc/autodoc.py

@@ -176,6 +176,8 @@ def html(self, groups='all', template=None, **context):
         By specifying the group or groups arguments, only routes belonging to
         those groups will be returned.
         """
+        if not self.app:
+            raise RuntimeError("Autodoc was not initialized with the Flask app.")
         context['autodoc'] = context['autodoc'] if 'autodoc' in context \
             else self.generate(groups=groups)
         context['defaults'] = context['defaults'] if 'defaults' in context \

setup.py

@@ -41,5 +41,5 @@ def readme():
         'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
         'Topic :: Software Development :: Libraries :: Python Modules'
     ],
-    test_suite='tests.test_autodoc',
+    test_suite='tests',
 )

tests/test_error_handling.py

@@ -0,0 +1,13 @@
+import unittest
+
+from flask import Flask
+from flask_autodoc import Autodoc
+
+
+class TestErrorHandling(unittest.TestCase):
+    def test_app_not_initialized(self):
+        app = Flask(__name__)
+        app.debug = True
+        autodoc = Autodoc()
+        with app.app_context():
+            self.assertRaises(RuntimeError, lambda: autodoc.html())