Update test_4141.py

1. added pathlib.Path for cleaner path handling
2. Cleaner, more readable code.
3. added more necessary comments

Author: Mohataseem89

tests/test_4141.py

@@ -1,19 +1,27 @@
 import pymupdf
-
-import os.path
+from pathlib import Path
 
 
 def test_4141():
-    """survive missing /Resources object in a number of cases."""
-    path = os.path.abspath(f"{__file__}/../../tests/resources/test_4141.pdf")
-    doc = pymupdf.open(path)
-    page = doc[0]
-    # make sure the right test file
-    assert doc.xref_get_key(page.xref, "Resources") == ("null", "null")
-    page.insert_htmlbox((100, 100, 200, 200), "Hallo")  # will fail without the fix
-    doc.close()
-    doc = pymupdf.open(doc.name)
-    page = doc[0]
-    tw = pymupdf.TextWriter(page.rect)
-    tw.append((100, 100), "Hallo")
-    tw.write_text(page)  # will fail without the fix
+    """Survive missing /Resources object in multiple situations."""
+
+    # Resolve the test file path
+    test_pdf = Path(__file__).resolve().parent.parent / "tests" / "resources" / "test_4141.pdf"
+    assert test_pdf.exists(), f"Missing test file: {test_pdf}"
+
+    # Case 1: Insert HTML box
+    with pymupdf.open(test_pdf) as doc:
+        page = doc[0]
+
+        # Ensure we are using the correct test file
+        assert doc.xref_get_key(page.xref, "Resources") == ("null", "null")
+
+        # Should not fail after the fix
+        page.insert_htmlbox((100, 100, 200, 200), "Hallo")
+
+    # Case 2: TextWriter operations after reopen
+    with pymupdf.open(test_pdf) as doc:
+        page = doc[0]
+        tw = pymupdf.TextWriter(page.rect)
+        tw.append((100, 100), "Hallo")
+        tw.write_text(page)  # Should also not fail