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import unittest, cPickle as pickle
from cStringIO import StringIO
from scrapy.item import Item, Field
from scrapy.utils.python import str_to_unicode
from scrapy.utils.py26 import json
from scrapy.contrib.exporter import BaseItemExporter, PprintItemExporter, \
PickleItemExporter, CsvItemExporter, XmlItemExporter, JsonLinesItemExporter, \
JsonItemExporter
class TestItem(Item):
name = Field()
age = Field()
class BaseItemExporterTest(unittest.TestCase):
def setUp(self):
self.i = TestItem(name=u'John\xa3', age='22')
self.output = StringIO()
self.ie = self._get_exporter()
def _get_exporter(self, **kwargs):
return BaseItemExporter(**kwargs)
def _check_output(self):
pass
def _assert_expected_item(self, exported_dict):
for k, v in exported_dict.items():
exported_dict[k] = str_to_unicode(v)
self.assertEqual(self.i, exported_dict)
def test_export_item(self):
self.ie.start_exporting()
try:
self.ie.export_item(self.i)
except NotImplementedError:
if self.ie.__class__ is not BaseItemExporter:
raise
self.ie.finish_exporting()
self._check_output()
def test_serialize_field(self):
self.assertEqual(self.ie.serialize_field( \
self.i.fields['name'], 'name', self.i['name']), 'John\xc2\xa3')
self.assertEqual( \
self.ie.serialize_field(self.i.fields['age'], 'age', self.i['age']), '22')
def test_fields_to_export(self):
ie = self._get_exporter(fields_to_export=['name'])
self.assertEqual(list(ie._get_serialized_fields(self.i)), [('name', 'John\xc2\xa3')])
ie = self._get_exporter(fields_to_export=['name'], encoding='latin-1')
name = list(ie._get_serialized_fields(self.i))[0][1]
assert isinstance(name, str)
self.assertEqual(name, 'John\xa3')
def test_field_custom_serializer(self):
def custom_serializer(value):
return str(int(value) + 2)
class CustomFieldItem(Item):
name = Field()
age = Field(serializer=custom_serializer)
i = CustomFieldItem(name=u'John\xa3', age='22')
ie = self._get_exporter()
self.assertEqual(ie.serialize_field(i.fields['name'], 'name', i['name']), 'John\xc2\xa3')
self.assertEqual(ie.serialize_field(i.fields['age'], 'age', i['age']), '24')
class PprintItemExporterTest(BaseItemExporterTest):
def _get_exporter(self, **kwargs):
return PprintItemExporter(self.output, **kwargs)
def _check_output(self):
self._assert_expected_item(eval(self.output.getvalue()))
class PickleItemExporterTest(BaseItemExporterTest):
def _get_exporter(self, **kwargs):
return PickleItemExporter(self.output, **kwargs)
def _check_output(self):
self._assert_expected_item(pickle.loads(self.output.getvalue()))
def test_export_multiple_items(self):
i1 = TestItem(name='hello', age='world')
i2 = TestItem(name='bye', age='world')
f = StringIO()
ie = PickleItemExporter(f)
ie.start_exporting()
ie.export_item(i1)
ie.export_item(i2)
ie.finish_exporting()
f.reset()
self.assertEqual(pickle.load(f), i1)
self.assertEqual(pickle.load(f), i2)
class CsvItemExporterTest(BaseItemExporterTest):
def _get_exporter(self, **kwargs):
return CsvItemExporter(self.output, **kwargs)
def _check_output(self):
self.assertEqual(self.output.getvalue(), 'age,name\r\n22,John\xc2\xa3\r\n')
def test_header(self):
output = StringIO()
ie = CsvItemExporter(output, fields_to_export=self.i.fields.keys())
ie.start_exporting()
ie.export_item(self.i)
ie.finish_exporting()
self.assertEqual(output.getvalue(), 'age,name\r\n22,John\xc2\xa3\r\n')
output = StringIO()
ie = CsvItemExporter(output, fields_to_export=['age'])
ie.start_exporting()
ie.export_item(self.i)
ie.finish_exporting()
self.assertEqual(output.getvalue(), 'age\r\n22\r\n')
output = StringIO()
ie = CsvItemExporter(output)
ie.start_exporting()
ie.export_item(self.i)
ie.export_item(self.i)
ie.finish_exporting()
self.assertEqual(output.getvalue(), 'age,name\r\n22,John\xc2\xa3\r\n22,John\xc2\xa3\r\n')
output = StringIO()
ie = CsvItemExporter(output, include_headers_line=False)
ie.start_exporting()
ie.export_item(self.i)
ie.finish_exporting()
self.assertEqual(output.getvalue(), '22,John\xc2\xa3\r\n')
def test_join_multivalue(self):
class TestItem2(Item):
name = Field()
friends = Field()
i = TestItem2(name='John', friends=['Mary', 'Paul'])
output = StringIO()
ie = CsvItemExporter(output, include_headers_line=False)
ie.start_exporting()
ie.export_item(i)
ie.finish_exporting()
self.assertEqual(output.getvalue(), '"Mary,Paul",John\r\n')
class XmlItemExporterTest(BaseItemExporterTest):
def _get_exporter(self, **kwargs):
return XmlItemExporter(self.output, **kwargs)
def _check_output(self):
expected_value = '<?xml version="1.0" encoding="utf-8"?>\n<items><item><age>22</age><name>John\xc2\xa3</name></item></items>'
self.assertEqual(self.output.getvalue(), expected_value)
def test_multivalued_fields(self):
output = StringIO()
item = TestItem(name=[u'John\xa3', u'Doe'])
ie = XmlItemExporter(output)
ie.start_exporting()
ie.export_item(item)
ie.finish_exporting()
expected_value = '<?xml version="1.0" encoding="utf-8"?>\n<items><item><name><value>John\xc2\xa3</value><value>Doe</value></name></item></items>'
self.assertEqual(output.getvalue(), expected_value)
class JsonLinesItemExporterTest(BaseItemExporterTest):
def _get_exporter(self, **kwargs):
return JsonLinesItemExporter(self.output, **kwargs)
def _check_output(self):
exported = json.loads(self.output.getvalue().strip())
self.assertEqual(exported, dict(self.i))
class JsonItemExporterTest(JsonLinesItemExporterTest):
def _get_exporter(self, **kwargs):
return JsonItemExporter(self.output, **kwargs)
def _check_output(self):
exported = json.loads(self.output.getvalue().strip())
self.assertEqual(exported, [dict(self.i)])
def test_two_items(self):
self.ie.start_exporting()
self.ie.export_item(self.i)
self.ie.export_item(self.i)
self.ie.finish_exporting()
exported = json.loads(self.output.getvalue())
self.assertEqual(exported, [dict(self.i), dict(self.i)])
class CustomItemExporterTest(unittest.TestCase):
def test_exporter_custom_serializer(self):
class CustomItemExporter(BaseItemExporter):
def serialize_field(self, field, name, value):
if name == 'age':
return str(int(value) + 1)
else:
return super(CustomItemExporter, self).serialize_field(field, \
name, value)
i = TestItem(name=u'John', age='22')
ie = CustomItemExporter()
self.assertEqual( \
ie.serialize_field(i.fields['name'], 'name', i['name']), 'John')
self.assertEqual(
ie.serialize_field(i.fields['age'], 'age', i['age']), '23')
if __name__ == '__main__':
unittest.main()
|
