diff --git a/src/img2pdf_test.py b/src/img2pdf_test.py
index 5d9ce85..3cfdebf 100755
--- a/src/img2pdf_test.py
+++ b/src/img2pdf_test.py
@@ -7146,6 +7146,17 @@ def test_general(general_input, engine):
         pass
 
 
+def test_return_engine_doc():
+    inputf = os.path.join(os.path.dirname(__file__), "tests", "input", "normal.jpg")
+    outputf = os.path.join(
+        os.path.dirname(__file__), "tests", "output", "engine_normal.jpg.pdf"
+    )
+    pdf, min_version = img2pdf.convert(inputf, return_engine_doc=True, engine=img2pdf.Engine.pikepdf)
+    assert isinstance(pdf, pikepdf.Pdf)
+    pdf.save(outputf, min_version=min_version, linearize=True)
+    assert os.path.isfile(outputf)
+
+
 def main():
     normal16 = alpha_value()[:, :, 0:3]
     pathlib.Path("test.icc").write_bytes(icc_profile())