diff --git a/src/escpos/escpos.py b/src/escpos/escpos.py
index 8cab39f..31e0b9a 100644
--- a/src/escpos/escpos.py
+++ b/src/escpos/escpos.py
@@ -154,6 +154,10 @@ class Escpos(object, metaclass=ABCMeta):
         """Open a printer device/connection."""
         pass
 
+    def close(self):
+        """Close a printer device/connection."""
+        pass
+
     @abstractmethod
     def _raw(self, msg: bytes) -> None:
         """Send raw data to the printer.
diff --git a/test/test_printers/test_printer_cups.py b/test/test_printers/test_printer_cups.py
index 1b9cb43..eb4a6f5 100644
--- a/test/test_printers/test_printer_cups.py
+++ b/test/test_printers/test_printer_cups.py
@@ -173,4 +173,4 @@ def test_read_no_device(cupsprinter) -> None:
     THEN check the return value is b''
     """
     cupsprinter.device = None
-    assert cupsprinter._read() == b''
+    assert cupsprinter._read() == b""