Add case for detecing invalid input

tests/test_register.py

@@ -19,7 +19,7 @@ def test_request_unauth(client):
     assert response.json['error'] == 'Access Denied'
 
 
-def test_request_example(client, mocker):
+def test_request_valid(client, mocker):
     def noop():
         pass
     run_res = SimpleNamespace()
@@ -38,3 +38,24 @@ def test_request_example(client, mocker):
                           headers={"Authorization": "Basic " + valid_credentials})
 
     assert response.json['remote_user'] == 'test.example.com'
+
+
+def test_request_invalid(client, mocker):
+    def noop():
+        pass
+    run_res = SimpleNamespace()
+    run_res.stdout = pfctl_stdout_lines
+    run_res.check_returncode = noop
+
+    mocker.patch('jail2ban.pfctl.run', return_value=run_res)
+
+    valid_credentials = base64.b64encode(b"test.example.com:testpassword").decode("utf-8")
+    json_payload = {"port":
+                    "not a pf statement",
+                    "name": "dovecot", "protocol": "tcp"}
+
+    response = client.put("/register",
+                          json=json_payload,
+                          headers={"Authorization": "Basic " + valid_credentials})
+
+    assert response.json['error'] == '"not a pf statement" is tainted'