python3Packages.salmon-mail: fix test_main exit code on click 8.2+ (#523372)

pkgs/development/python-modules/salmon-mail/default.nix

@@ -23,6 +23,11 @@ buildPythonPackage rec {
     hash = "sha256-ysBO/ridfy7YPoTsVwAxar9UvfM/qxrx2dp0EtDNLvE=";
   };
 
+  patches = [
+    # Fix test_main expecting exit code 0 from click group with no args (click 8.2 returns 2).
+    ./test-main-click-8.2-exit-code.patch
+  ];
+
   nativeCheckInputs = [
     jinja2
     unittestCheckHook

pkgs/development/python-modules/salmon-mail/test-main-click-8.2-exit-code.patch

@@ -0,0 +1,12 @@
+--- a/tests/test_command.py
++++ b/tests/test_command.py
+@@ -48,7 +48,8 @@
+     def test_main(self):
+         runner = CliRunner()
+         result = runner.invoke(commands.main)
+-        self.assertEqual(result.exit_code, 0)
++        # click 8.2 changed the exit code when no_args_is_help displays help: 0 -> 2.
++        self.assertEqual(result.exit_code, 2)
+
+     @patch('salmon.queue.Queue')
+     def test_queue_command(self, MockQueue):