--- /dev/null
+#!/bin/sh
+
+[ "$1" = python3-pyasn1 ] || exit 0
+
+python3 - << 'EOF'
+
+from collections import OrderedDict
+
+from pyasn1.type import namedtype
+from pyasn1.type import tag
+from pyasn1.type import univ
+from pyasn1.codec.der.encoder import encode as derEncode
+from pyasn1.codec.der.decoder import decode as derDecode
+from pyasn1.codec.native.encoder import encode as nativeEncode
+from pyasn1.codec.native.decoder import decode as nativeDecode
+
+class Record(univ.Sequence):
+ componentType = namedtype.NamedTypes(
+ namedtype.NamedType('id', univ.Integer()),
+ namedtype.OptionalNamedType(
+ 'room', univ.Integer().subtype(
+ implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0)
+ )
+ ),
+ namedtype.DefaultedNamedType(
+ 'house', univ.Integer(0).subtype(
+ implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1)
+ )
+ )
+ )
+
+# encoding modifies the object (https://github.com/pyasn1/pyasn1/issues/53)
+# so test decoding before encoding
+
+record = Record()
+record['id'] = 123
+record['room'] = 321
+assert str(record) == 'Record:\n id=123\n room=321\n'
+
+substrate = b'0\x07\x02\x01{\x80\x02\x01A'
+
+received_record, _ = derDecode(substrate, asn1Spec=Record())
+assert received_record == record
+
+dict_record = nativeDecode({'id': 123, 'room': 321}, asn1Spec=Record())
+assert dict_record == record
+
+assert derEncode(record) == substrate
+assert nativeEncode(record) == OrderedDict([('id', 123), ('room', 321), ('house', 0)])
+
+EOF