Fix test for changed error message from newer Django (djmain) (#1486)

* fix djmain changes the error message text

* remove unnecceesary verbose assert message and avoid E501

* conditionalize error message test based on Django version

tests/test_commands.py

@@ -130,6 +130,8 @@ def test_application_created_with_algorithm(self):
         self.assertEqual(app.algorithm, "RS256")
 
     def test_validation_failed_message(self):
+        import django
+
         output = StringIO()
         call_command(
             "createapplication",
@@ -140,6 +142,10 @@ def test_validation_failed_message(self):
             stdout=output,
         )
 
-        self.assertIn("user", output.getvalue())
-        self.assertIn("783", output.getvalue())
-        self.assertIn("does not exist", output.getvalue())
+        output_str = output.getvalue()
+        self.assertIn("user", output_str)
+        self.assertIn("783", output_str)
+        if django.VERSION < (5, 2):
+            self.assertIn("does not exist", output_str)
+        else:
+            self.assertIn("is not a valid choice", output_str)