add tests for interfaces view (#1768)

* add tests for interfaces view

* fix failing tests

* chore: update interfaces test

* fix python  lint

* fix failing test

* remove unused variable

requirements.txt

@@ -18,4 +18,4 @@ PyGithub==2.2.0
 black==24.3.0
 flake8==6.1.0
 Flask-Caching==2.1.0
-responses==0.22.0
+responses==0.22.0

tests/interfaces/test_single_interface.py

@@ -0,0 +1,87 @@
+import json
+from unittest.mock import patch
+from unittest import TestCase
+
+import responses
+from webapp.app import app
+from webapp.integrations.logic import Interfaces
+
+
+class TestSingleInterface(TestCase):
+
+    def setUp(self):
+        app.config["TESTING"] = True
+        app.config["DEBUG"] = True
+        self.client = app.test_client()
+        self.test_interfaces = Interfaces()
+        # mock_github_client = patch("webapp.integrations.logic.github_client")
+
+        self.github_interfaces_url = "".join(
+            [
+                "https://api.github.com/repos/canonical/",
+                "charm-relation-interfaces/contents/interfaces",
+            ]
+        )
+        self.charmhub_api_get_requirers = "".join(
+            [
+                "https://api.charmhub.io/v2/charms/find?",
+                "q=&category=&publisher=&requires=test_interface",
+            ]
+        )
+        self.charmhub_api_get_providers = "".join(
+            [
+                "https://api.charmhub.io/v2/charms/find?",
+                "q=&category=&publisher=&provides=test_interface",
+            ]
+        )
+
+    @responses.activate
+    def test_single_interface(self):
+        responses.add(
+            responses.Response(
+                method="GET",
+                url=f"{self.github_interfaces_url}/test_interface",
+                body="test_interface",
+                status=200,
+            )
+        )
+        responses.add(
+            responses.Response(
+                method="GET",
+                url=self.charmhub_api_get_requirers,
+                body=json.dumps({"results": ["test_interface1"]}),
+                status=200,
+            )
+        )
+        responses.add(
+            responses.Response(
+                method="GET",
+                url=self.charmhub_api_get_providers,
+                body=json.dumps({"results": ["test_interface2"]}),
+                status=200,
+            )
+        )
+        response = self.client.get("/integrations/test_interface.json")
+        self.assertEqual(response.status_code, 200)
+        self.assertDictEqual(
+            response.json,
+            {
+                "other_charms": {
+                    "providers": ["test_interface2"],
+                    "requirers": ["test_interface1"],
+                }
+            },
+        )
+
+    @patch("webapp.integrations.logic.Interfaces")
+    @patch("webapp.app.app.store_api.find")
+    def test_repo_has_no_interface(self, mock_find, mock_interfaces):
+        mock_find.return_value = {
+            "results": ["mock_providers", "mock_requirers"]
+        }
+
+        mock_interface_logic = mock_interfaces()
+        mock_interface_logic.get_interface_list.return_value = []
+        response = self.client.get("/integrations/test_interface.json")
+        self.assertEqual(response.status_code, 200)
+        self.assertIn(b"other_charms", response.data)