diff --git a/Tests/ScriptsTests/test_distribute_testflight_beta.py b/Tests/ScriptsTests/test_distribute_testflight_beta.py
index fc00e53..c0371fd 100644
--- a/Tests/ScriptsTests/test_distribute_testflight_beta.py
+++ b/Tests/ScriptsTests/test_distribute_testflight_beta.py
@@ -367,10 +367,52 @@ def test_parse_args_requires_platform(self):
                 "202606111944",
             ],
         ):
-            with mock.patch("sys.stderr", new_callable=io.StringIO):
-                with self.assertRaises(SystemExit):
+            with mock.patch("sys.stderr", new_callable=io.StringIO) as error_output:
+                with self.assertRaises(SystemExit) as context:
                     distribute_testflight_beta.parse_args()
 
+        self.assertEqual(context.exception.code, 2)
+        self.assertIn("the following arguments are required: --platform", error_output.getvalue())
+
+    def test_parse_args_accepts_each_supported_platform(self):
+        for platform in ("IOS", "MAC_OS", "TV_OS", "VISION_OS"):
+            with self.subTest(platform=platform):
+                with mock.patch(
+                    "sys.argv",
+                    [
+                        "distribute-testflight-beta.py",
+                        "--version",
+                        "1.0.22",
+                        "--build-number",
+                        "202606111944",
+                        "--platform",
+                        platform,
+                    ],
+                ):
+                    arguments = distribute_testflight_beta.parse_args()
+
+                self.assertEqual(arguments.platform, platform)
+
+    def test_parse_args_rejects_unsupported_platform(self):
+        with mock.patch(
+            "sys.argv",
+            [
+                "distribute-testflight-beta.py",
+                "--version",
+                "1.0.22",
+                "--build-number",
+                "202606111944",
+                "--platform",
+                "ANDROID",
+            ],
+        ):
+            with mock.patch("sys.stderr", new_callable=io.StringIO) as error_output:
+                with self.assertRaises(SystemExit) as context:
+                    distribute_testflight_beta.parse_args()
+
+        self.assertEqual(context.exception.code, 2)
+        self.assertIn("invalid choice: 'ANDROID'", error_output.getvalue())
+
     def test_request_retries_transient_http_failures(self):
         client = distribute_testflight_beta.ASCClient("token")
 
diff --git a/Tests/ScriptsTests/test_release_workflows.py b/Tests/ScriptsTests/test_release_workflows.py
index baa0727..8463274 100644
--- a/Tests/ScriptsTests/test_release_workflows.py
+++ b/Tests/ScriptsTests/test_release_workflows.py
@@ -901,7 +901,6 @@ def test_testflight_beta_distribution_workflow_uses_distribution_script(self):
         self.assertIn("- TV_OS", workflow)
         self.assertIn("/betaGroups/{group_id}/relationships/builds", script)
         self.assertIn("processingState", script)
-        self.assertIn('required=True,\n        choices=("IOS", "MAC_OS", "TV_OS", "VISION_OS")', script)
 
     def test_app_store_screenshot_upload_workflow_uses_safe_defaults(self):
         workflow = self.read(".github/workflows/upload-app-store-screenshots.yml")