Add test for context manager with stream

tests/test_reader.py

@@ -1556,3 +1556,38 @@ def test_looping_form(caplog):
     flds2 = writer.get_fields()
     assert "Text68.0 already parsed" in caplog.text
     assert list(flds.keys()) == list(flds2.keys())
+
+
+def test_context_manager_with_stream():
+    pdf_data = (
+        b"%%PDF-1.7\n"
+        b"1 0 obj << /Count 1 /Kids [4 0 R] /Type /Pages >> endobj\n"
+        b"2 0 obj << >> endobj\n"
+        b"3 0 obj << >> endobj\n"
+        b"4 0 obj << /Contents 3 0 R /CropBox [0.0 0.0 2550.0 3508.0]"
+        b" /MediaBox [0.0 0.0 2550.0 3508.0] /Parent 1 0 R"
+        b" /Resources << /Font << >> >>"
+        b" /Rotate 0 /Type /Page >> endobj\n"
+        b"5 0 obj << /Pages 1 0 R /Type /Catalog >> endobj\n"
+        b"xref 1 5\n"
+        b"%010d 00000 n\n"
+        b"%010d 00000 n\n"
+        b"%010d 00000 n\n"
+        b"%010d 00000 n\n"
+        b"%010d 00000 n\n"
+        b"trailer << /Root 5 0 R /Size 6 >>\n"
+        b"startxref %d\n"
+        b"%%%%EOF"
+    )
+    pdf_data = pdf_data % (
+        pdf_data.find(b"1 0 obj"),
+        pdf_data.find(b"2 0 obj"),
+        pdf_data.find(b"3 0 obj"),
+        pdf_data.find(b"4 0 obj"),
+        pdf_data.find(b"5 0 obj"),
+        pdf_data.find(b"xref") - 1,
+    )
+    pdf_stream = io.BytesIO(pdf_data)
+    with PdfReader(pdf_stream) as reader:
+        assert not reader.stream.closed
+    assert not pdf_stream.closed