Added test, fixed dkim management command

Thank you test

modoboa/admin/management/commands/subcommands/_manage_dkim_keys.py

@@ -65,6 +65,9 @@ class ManageDKIMKeys(BaseCommand):
 
     def handle(self, *args, **options):
         """Entry point."""
+        self.default_key_length = param_tools.get_global_parameter(
+            "dkim_default_key_length")
+
         if options["domain"] != "":
             domain = models.Domain.objects.filter(name=options["domain"],
                                                   enable_dkim=True,
@@ -75,8 +78,6 @@ class ManageDKIMKeys(BaseCommand):
                                            domains=domain)
             return
 
-        self.default_key_length = param_tools.get_global_parameter(
-            "dkim_default_key_length")
         qset = models.Domain.objects.filter(
             enable_dkim=True, dkim_private_key_path="")
         for domain in qset:

modoboa/admin/tests/test_domain.py

@@ -470,12 +470,21 @@ class DKIMTestCase(ModoTestCase):
             constants.ALARM_CLOSED)
         key_path = os.path.join(self.workdir, "{}.pem".format(values["name"]))
         self.assertTrue(os.path.exists(key_path))
-        domain = Domain.objects.get(name=values["name"])
+
+        domain.refresh_from_db()
         url = reverse("admin:domain_detail", args=[domain.pk])
         response = self.client.get(url)
         self.assertContains(
             response, escape(domain.bind_format_dkim_public_key))
 
+        # Try generating DKIM key for a targetted domain
+        domain.dkim_private_key_path = ""
+        domain.save()
+
+        call_command("modo", "manage_dkim_keys", f"--domain={domain.name}")
+        domain.refresh_from_db()
+        self.assertNotEqual(domain.dkim_private_key_path, "")
+
     def test_dkim_key_length_modification(self):
         """ """
         self.set_global_parameter("dkim_keys_storage_dir", self.workdir)