idempotency tests for parsers for coverage

Author: bckohan

README.rst

@@ -47,7 +47,7 @@ preserved, so that TyperCommand can be a drop in replacement.
 
 **django-typer makes it easy to:**
 
-   * Define your command CLI interface in as clear, DRY, and safely as possible using type hints
+   * Define your command CLI interface in a clear, DRY and safe way using type hints
    * Create subcommand and group command hierarchies.
    * Use the full power of Typer's parameter types to validate and parse command line inputs.
    * Create beautiful and information dense help outputs.

django_typer/tests/tests.py

@@ -1783,6 +1783,10 @@ def test_poll_ex(self):
 class TestShellCompletersAndParsers(TestCase):
     def setUp(self):
         super().setUp()
+        self.q1 = Question.objects.create(
+            question_text="Is Putin a war criminal?",
+            pub_date=timezone.now(),
+        )
         for field, values in {
             "char_field": ["jon", "john", "jack", "jason"],
             "text_field": [
@@ -1819,6 +1823,19 @@ def tearDown(self) -> None:
         ShellCompleteTester.objects.all().delete()
         return super().tearDown()
 
+    def test_model_object_parser_idempotency(self):
+        from django_typer.parsers import ModelObjectParser
+        from django_typer.tests.polls.models import Question
+
+        parser = ModelObjectParser(Question)
+        self.assertEqual(parser.convert(self.q1, None, None), self.q1)
+
+    def test_app_label_parser_idempotency(self):
+        from django_typer.parsers import parse_app_label
+
+        poll_app = apps.get_app_config("django_typer_tests_polls")
+        self.assertEqual(parse_app_label(poll_app), poll_app)
+
     def test_app_label_parser_completers(self):
         from django.apps import apps
 

doc/source/index.rst

@@ -10,7 +10,7 @@ BaseCommand functionality is preserved, so that TyperCommand can be a drop in re
 
 **django-typer makes it easy to:**
 
-   * Define your command CLI interface in as clear, DRY, and safely as possible using type hints
+   * Define your command CLI interface in a clear, DRY and safe way using type hints
    * Create subcommand and group command hierarchies.
    * Use the full power of Typer's parameter types to validate and parse command line inputs.
    * Create beautiful and information dense help outputs.