raise exception when TypeError occurs in cashdraw (#268)

.mailmap

@@ -10,3 +10,4 @@ Ahmed Tahri <nyuubi.10@gmail.com>                    TAHRI Ahmed <nyuubi.10@gmai
 Michael Elsdörfer <michael@elsdoerfer.com>           Michael Elsdörfer <michael@elsdoerfer.info>
 csoft2k <csoft2k@hotmail.com>
 Sergio Pulgarin <sergio.pulgarin@gmail.com>
+reck31 <rakesh.gunduka@gmail.com>

AUTHORS

@@ -20,6 +20,7 @@ mrwunderbar666
 Nathan Bookham
 Patrick Kanzler
 Qian Linfeng
+reck31
 Renato Lorenzi
 Romain Porte
 Sam Cheng

src/escpos/escpos.py

@@ -697,8 +697,8 @@ class Escpos(object):
         else:
             try:
                 self._raw(CD_KICK_DEC_SEQUENCE(*pin))
-            except:
-                raise CashDrawerError()
+            except TypeError as err:
+                raise CashDrawerError(err)
 
     def linedisplay_select(self, select_display=False):
         """ Selects the line display or the printer

test/test_function_cashdraw.py

@@ -0,0 +1,19 @@
+#!/usr/bin/python
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import escpos.printer as printer
+from escpos.exceptions import CashDrawerError
+import pytest
+
+
+def test_raise_CashDrawerError():
+    """should raise an error if the sequence is invalid.
+    """
+    instance = printer.Dummy()
+    with pytest.raises(CashDrawerError):
+        # call with sequence that is too long
+        instance.cashdraw([1,1,1,1,1,1])
+