From a2128d3c6ab3655b3d032dc8e38c143c7d55b249 Mon Sep 17 00:00:00 2001
From: BonfaceKilz
Date: Tue, 4 Jan 2022 16:04:57 +0300
Subject: How to test decorators

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 api/testing-endpoints.md | 44 ++++++++++++++++++++++++++++++++++++++++++++
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 create mode 100644 api/testing-endpoints.md

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+# How to test endpoints with decorators
+
+Say we have an the following endpoint in
+"genenetwork2/wqflask/wqflask/metadata_edits.py": that interpolates 2
+strings:
+
+```
+@metadata_edit.route("/<a>/addition/<b>", methods=("POST",))
+@edit_admins_access_required
+@login_required
+def addition(a, b):
+    return a + b
+```
+
+
+To test it, see:
+
+```
+import unittest
+import mock
+import imp
+import wqflask
+
+class TestMetadataEdits(unittest.TestCase):
+    def setUp(self):
+        def kill_patches():
+            mock.patch.stopall()
+            imp.reload(wqflask.metadata_edits)
+        self.addCleanup(kill_patches)
+        mock.patch('wqflask.decorators.login_required',
+                   lambda x: x).start()
+        mock.patch('wqflask.decorators.edit_admins_access_required',
+                   lambda x: x).start()
+        imp.reload(wqflask.metadata_edits)
+        imp.reload(wqflask)
+        self.app = wqflask.app.test_client()
+
+    def test_addition(self):
+        resp = self.app.post("/datasets/3/addition/2")
+        self.assertEqual(resp.data, b'32')
+
+```
+
+For an in-depth explanation, read this [post](https://newbedev.com/can-i-patch-a-python-decorator-before-it-wraps-a-function "Can I patch a Python decorator before it wraps a function?")
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