--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_metadata.py	Mon Sep 15 11:37:51 2025 +0200
@@ -0,0 +1,43 @@
+"""
+1. Read metadata and compare with stored expected result.
+2. Erase metadata and assert object has indeed been deleted.
+"""
+import json
+import os
+import sys
+
+import pymupdf
+
+scriptdir = os.path.abspath(os.path.dirname(__file__))
+filename = os.path.join(scriptdir, "resources", "001003ED.pdf")
+metafile = os.path.join(scriptdir, "resources", "metadata.txt")
+doc = pymupdf.open(filename)
+
+
+def test_metadata():
+    assert json.dumps(doc.metadata) == open(metafile).read()
+
+
+def test_erase_meta():
+    doc.set_metadata({})
+    # Check PDF trailer and assert that there is no more /Info object
+    # or is set to "null".
+    statement1 = doc.xref_get_key(-1, "Info")[1] == "null"
+    statement2 = "Info" not in doc.xref_get_keys(-1)
+    assert statement2 or statement1
+
+
+def test_3237():
+    filename = os.path.abspath(f'{__file__}/../../tests/resources/001003ED.pdf')
+    with pymupdf.open(filename) as doc:
+        # We need to explicitly encode in utf8 on windows.
+        metadata1 = doc.metadata
+        metadata1 = repr(metadata1).encode('utf8')
+        doc.set_metadata({})
+
+        metadata2 = doc.metadata
+        metadata2 = repr(metadata2).encode('utf8')
+        print(f'{metadata1=}')
+        print(f'{metadata2=}')
+        assert metadata1 == b'{\'format\': \'PDF 1.6\', \'title\': \'RUBRIK_Editorial_01-06.indd\', \'author\': \'Natalie Schaefer\', \'subject\': \'\', \'keywords\': \'\', \'creator\': \'\', \'producer\': \'Acrobat Distiller 7.0.5 (Windows)\', \'creationDate\': "D:20070113191400+01\'00\'", \'modDate\': "D:20070120104154+01\'00\'", \'trapped\': \'\', \'encryption\': None}'
+        assert metadata2 == b"{'format': 'PDF 1.6', 'title': '', 'author': '', 'subject': '', 'keywords': '', 'creator': '', 'producer': '', 'creationDate': '', 'modDate': '', 'trapped': '', 'encryption': None}"