Refactor photo metadata workflow

unit_tests/test_exiftool.py

@@ -5,7 +5,9 @@ import unittest
 from pathlib import Path
 from unittest.mock import patch
 
-from tools.exiftool import run_exiftool_command
+from tools.exiftool import run_exiftool_command, run_exiftool_write
+from tools.media_metadata import parse_exif_datetime
+from tools.metadata_copy import copy_meaningful_metadata
 
 
 class ExiftoolInvocationTests(unittest.TestCase):
@@ -34,6 +36,36 @@ class ExiftoolInvocationTests(unittest.TestCase):
         )
         self.assertEqual(captured["contents"], "-j\nC:\\Photos\\M\u00e4rchen.jpg\n")
 
+    def test_write_captures_success_output(self) -> None:
+        with patch(
+            "tools.exiftool.subprocess.run",
+            return_value=subprocess.CompletedProcess([], 0, "1 image files updated\n", ""),
+        ) as run:
+            run_exiftool_write("exiftool", Path("photo.jpg"), ["-Artist=Test"])
+
+        self.assertTrue(run.call_args.kwargs["capture_output"])
+        self.assertTrue(run.call_args.kwargs["text"])
+
+    def test_write_includes_exiftool_failure_output(self) -> None:
+        with patch(
+            "tools.exiftool.subprocess.run",
+            return_value=subprocess.CompletedProcess([], 1, "", "Error renaming temporary file"),
+        ):
+            with self.assertRaisesRegex(RuntimeError, "Error renaming temporary file"):
+                run_exiftool_write("exiftool", Path("photo.jpg"), ["-Artist=Test"])
+
+    def test_metadata_copy_uses_exiftool_for_photos(self) -> None:
+        with patch("tools.metadata_copy.run_exiftool_command") as run:
+            copy_meaningful_metadata("exiftool", Path("source.jpg"), Path("target.jpg"))
+
+        args = run.call_args.args[1]
+        self.assertEqual(args[:4], ["-overwrite_original", "-TagsFromFile", "source.jpg", "-all:all"])
+        self.assertEqual(args[-1], "target.jpg")
+
+    def test_metadata_datetime_can_assume_utc(self) -> None:
+        parsed = parse_exif_datetime("2026:07:04 14:13:36", assume_utc=True)
+        self.assertEqual(str(parsed.tzinfo), "UTC")
+
 
 if __name__ == "__main__":
     unittest.main()