diff --git a/PyPDF2/_writer.py b/PyPDF2/_writer.py
index a56d4a8fb..a8ee9232d 100644
--- a/PyPDF2/_writer.py
+++ b/PyPDF2/_writer.py
@@ -1259,7 +1259,7 @@ def add_bookmark(
         italic: bool = False,
         fit: FitType = "/Fit",
         *args: ZoomArgType,
-    ) -> IndirectObject:
+    ) -> IndirectObject:  # pragma: no cover
         """
         .. deprecated:: 2.9.0
 
diff --git a/tests/test_generic.py b/tests/test_generic.py
index 13a0c6b6c..6a82df22c 100644
--- a/tests/test_generic.py
+++ b/tests/test_generic.py
@@ -608,6 +608,18 @@ def test_issue_997(mock_logger_warning):
         "Overwriting cache for 0 4", "PyPDF2._reader"
     )
 
+    # Strict
+    merger = PdfMerger(strict=True)
+    merged_filename = "tmp-out.pdf"
+    with pytest.raises(PdfReadError) as exc:
+        merger.append(
+            BytesIO(get_pdf_from_url(url, name=name))
+        )  # here the error raises
+    assert exc.value.args[0] == "Could not find object."
+    with open(merged_filename, "wb") as f:
+        merger.write(f)
+    merger.close()
+
     # cleanup
     os.remove(merged_filename)
 
diff --git a/tests/test_writer.py b/tests/test_writer.py
index d90c8bd45..0b7fa8b89 100644
--- a/tests/test_writer.py
+++ b/tests/test_writer.py
@@ -91,8 +91,9 @@ def writer_operate(writer):
     with pytest.warns(PendingDeprecationWarning):
         writer.add_link(2, 1, RectangleObject([0, 0, 100, 100]))
     assert writer._get_page_layout() is None
-    writer._set_page_layout("broken")
-    writer._set_page_layout("/SinglePage")
+    writer.page_layout = "broken"
+    assert writer.page_layout == "broken"
+    writer.page_layout = NameObject("/SinglePage")
     assert writer._get_page_layout() == "/SinglePage"
     assert writer._get_page_mode() is None
     writer.set_page_mode("/UseNone")