Add multiple strip saving test

Tests/test_file_libtiff.py

@@ -9,7 +9,7 @@
 import pytest
 
 from PIL import Image, ImageFilter, TiffImagePlugin, TiffTags, features
-from PIL.TiffImagePlugin import SUBIFD
+from PIL.TiffImagePlugin import SUBIFD, STRIPOFFSETS
 
 from .helper import (
     assert_image_equal,
@@ -967,3 +967,12 @@ def test_realloc_overflow(self):
             # Assert that the error code is IMAGING_CODEC_MEMORY
             assert str(e.value) == "-9"
         TiffImagePlugin.READ_LIBTIFF = False
+
+    def test_save_multistrip(self):
+        im = hopper("RGB").resize((256, 256))
+        out = str(tmp_path / "temp.tif")
+        im.save(out, compression="tiff_adobe_deflate")
+
+        with Image.open(out) as im:
+            # Assert that there are multiple strips
+            assert len(im.tag_v2[STRIPOFFSETS]) > 1