Add tests for Flask views

tests/stub_api.py

@@ -0,0 +1,37 @@
+# -*- encoding: utf-8 -*-
+import httpretty
+import os
+import pytest
+
+from stw_potsdam import canteen_api
+
+
+@pytest.fixture
+def api_offline():
+    """Disallow all network requests."""
+    httpretty.enable(allow_net_connect=False)
+    yield
+    httpretty.disable()
+    httpretty.reset()
+
+
+@pytest.fixture
+def api_online_one_shot():
+    """Allow a single API request, returning the contents of 'input.json'.
+    Subsequent API invocations will return with HTTP status code 500."""
+
+    def canned_menu(request, uri, response_headers):
+        path = os.path.join(os.path.dirname(__file__), 'resources', 'input.json')
+        with open(path) as f:
+            return 200, response_headers, f.read()
+
+    responses = [
+        httpretty.Response(body=canned_menu),
+        httpretty.Response(body='invalid', status=500),
+    ]
+
+    httpretty.register_uri(httpretty.POST,  canteen_api.URL, responses=responses)
+    httpretty.enable(allow_net_connect=False)
+    yield httpretty
+    httpretty.disable()
+    httpretty.reset()