feat(product-suite): add prompt template settings

tests/test_prompts.py

@@ -1,6 +1,7 @@
 import os
 import sys
 import unittest
+from unittest import mock
 
 sys.path.insert(0, os.path.dirname(__file__))
 
@@ -183,6 +184,85 @@ class PromptTests(TempDirMixin, unittest.TestCase):
             rendered,
         )
 
+    def test_product_suite_prompt_seed_save_and_restore_are_isolated(self):
+        with self.make_temp_dir() as temp_dir:
+            path = os.path.join(temp_dir, "prompts", "product_suite", "base.txt")
+            default_text = prompts.load_default_product_suite_prompt()
+
+            self.assertEqual(default_text, prompts.ensure_default_product_suite_prompt(path))
+            self.assertEqual(default_text, prompts.load_product_suite_prompt(path))
+
+            custom_text = "自定义说明\n" + default_text
+            prompts.save_product_suite_prompt(custom_text, path)
+            self.assertEqual(custom_text, prompts.ensure_default_product_suite_prompt(path))
+            self.assertEqual(custom_text, prompts.load_product_suite_prompt(path))
+
+            self.assertEqual(default_text, prompts.restore_default_product_suite_prompt(path))
+            self.assertEqual(default_text, prompts.load_product_suite_prompt(path))
+
+        self.assert_removed(temp_dir)
+
+    def test_product_suite_prompt_invalid_user_file_is_preserved(self):
+        with self.make_temp_dir() as temp_dir:
+            path = os.path.join(temp_dir, "prompts", "product_suite", "base.txt")
+            os.makedirs(os.path.dirname(path), exist_ok=True)
+            invalid = "坏模板{未知变量}"
+            with open(path, "w", encoding="utf-8") as handle:
+                handle.write(invalid)
+
+            with self.assertRaisesRegex(prompts.PromptError, "套图提示词模板无效"):
+                prompts.ensure_default_product_suite_prompt(path)
+            with open(path, "r", encoding="utf-8") as handle:
+                self.assertEqual(invalid, handle.read())
+
+        self.assert_removed(temp_dir)
+
+    def test_product_suite_prompt_unreadable_utf8_is_not_overwritten(self):
+        with self.make_temp_dir() as temp_dir:
+            path = os.path.join(temp_dir, "prompts", "product_suite", "base.txt")
+            os.makedirs(os.path.dirname(path), exist_ok=True)
+            raw = b"\xff\xfe\x00\x80"
+            with open(path, "wb") as handle:
+                handle.write(raw)
+
+            with self.assertRaisesRegex(prompts.PromptError, "读取失败"):
+                prompts.ensure_default_product_suite_prompt(path)
+            with open(path, "rb") as handle:
+                self.assertEqual(raw, handle.read())
+
+        self.assert_removed(temp_dir)
+
+    def test_product_suite_prompt_invalid_packaged_default_does_not_create_file(self):
+        with self.make_temp_dir() as temp_dir:
+            path = os.path.join(temp_dir, "prompts", "product_suite", "base.txt")
+            with mock.patch.object(
+                prompts,
+                "load_default_product_suite_prompt",
+                side_effect=prompts.PromptError(prompts.PRODUCT_SUITE_DEFAULT_ERROR),
+            ):
+                with self.assertRaisesRegex(prompts.PromptError, "内置套图提示词模板无效"):
+                    prompts.ensure_default_product_suite_prompt(path)
+            self.assertFalse(os.path.exists(path))
+
+        self.assert_removed(temp_dir)
+
+    def test_product_suite_prompt_atomic_save_failure_keeps_original(self):
+        with self.make_temp_dir() as temp_dir:
+            path = os.path.join(temp_dir, "prompts", "product_suite", "base.txt")
+            default_text = prompts.ensure_default_product_suite_prompt(path)
+            custom_text = "自定义说明\n" + default_text
+
+            with mock.patch("app.prompts.os.replace", side_effect=OSError("文件占用")):
+                with self.assertRaisesRegex(prompts.PromptError, "保存失败"):
+                    prompts.save_product_suite_prompt(custom_text, path)
+
+            self.assertEqual(default_text, prompts.load_product_suite_prompt(path))
+            self.assertFalse(
+                any(name.startswith(".prompt-") for name in os.listdir(os.path.dirname(path)))
+            )
+
+        self.assert_removed(temp_dir)
+
 
 if __name__ == "__main__":
     unittest.main()