mirror of
https://github.com/django/django.git
synced 2024-12-26 19:16:11 +00:00
9fb61cb64a
Thanks to @treyhunner and Loïc for their suggestions and review.
Backport of 72d3889db4 from master
186 lines
8.3 KiB
Python
186 lines
8.3 KiB
Python
# encoding: utf8
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from __future__ import unicode_literals
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import datetime
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import os
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import tokenize
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from django.core.validators import RegexValidator, EmailValidator
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from django.db import models, migrations
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from django.db.migrations.writer import MigrationWriter, SettingsReference
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from django.test import TestCase
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from django.conf import settings
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from django.utils import datetime_safe, six
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from django.utils.deconstruct import deconstructible
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from django.utils.translation import ugettext_lazy as _
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from django.utils.timezone import get_default_timezone
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class WriterTests(TestCase):
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"""
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Tests the migration writer (makes migration files from Migration instances)
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"""
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def safe_exec(self, string, value=None):
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l = {}
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try:
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exec(string, globals(), l)
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except Exception as e:
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if value:
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self.fail("Could not exec %r (from value %r): %s" % (string.strip(), value, e))
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else:
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self.fail("Could not exec %r: %s" % (string.strip(), e))
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return l
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def serialize_round_trip(self, value):
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string, imports = MigrationWriter.serialize(value)
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return self.safe_exec("%s\ntest_value_result = %s" % ("\n".join(imports), string), value)['test_value_result']
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def assertSerializedEqual(self, value):
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self.assertEqual(self.serialize_round_trip(value), value)
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def assertSerializedResultEqual(self, value, target):
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self.assertEqual(MigrationWriter.serialize(value), target)
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def assertSerializedFieldEqual(self, value):
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new_value = self.serialize_round_trip(value)
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self.assertEqual(value.__class__, new_value.__class__)
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self.assertEqual(value.max_length, new_value.max_length)
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self.assertEqual(value.null, new_value.null)
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self.assertEqual(value.unique, new_value.unique)
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def test_serialize(self):
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"""
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Tests various different forms of the serializer.
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This does not care about formatting, just that the parsed result is
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correct, so we always exec() the result and check that.
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"""
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# Basic values
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self.assertSerializedEqual(1)
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self.assertSerializedEqual(None)
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self.assertSerializedEqual(b"foobar")
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string, imports = MigrationWriter.serialize(b"foobar")
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self.assertEqual(string, "b'foobar'")
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self.assertSerializedEqual("föobár")
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string, imports = MigrationWriter.serialize("foobar")
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self.assertEqual(string, "'foobar'")
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self.assertSerializedEqual({1: 2})
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self.assertSerializedEqual(["a", 2, True, None])
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self.assertSerializedEqual(set([2, 3, "eighty"]))
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self.assertSerializedEqual({"lalalala": ["yeah", "no", "maybe"]})
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self.assertSerializedEqual(_('Hello'))
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# Functions
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with six.assertRaisesRegex(self, ValueError, 'Cannot serialize function: lambda'):
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self.assertSerializedEqual(lambda x: 42)
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self.assertSerializedEqual(models.SET_NULL)
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string, imports = MigrationWriter.serialize(models.SET(42))
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self.assertEqual(string, 'models.SET(42)')
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self.serialize_round_trip(models.SET(42))
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# Datetime stuff
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self.assertSerializedEqual(datetime.datetime.utcnow())
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self.assertSerializedEqual(datetime.datetime.utcnow)
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self.assertSerializedEqual(datetime.datetime.today())
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self.assertSerializedEqual(datetime.datetime.today)
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self.assertSerializedEqual(datetime.date.today())
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self.assertSerializedEqual(datetime.date.today)
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with self.assertRaises(ValueError):
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self.assertSerializedEqual(datetime.datetime(2012, 1, 1, 1, 1, tzinfo=get_default_timezone()))
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safe_date = datetime_safe.date(2014, 3, 31)
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string, imports = MigrationWriter.serialize(safe_date)
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self.assertEqual(string, repr(datetime.date(2014, 3, 31)))
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self.assertEqual(imports, {'import datetime'})
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safe_datetime = datetime_safe.datetime(2014, 3, 31, 16, 4, 31)
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string, imports = MigrationWriter.serialize(safe_datetime)
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self.assertEqual(string, repr(datetime.datetime(2014, 3, 31, 16, 4, 31)))
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self.assertEqual(imports, {'import datetime'})
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# Classes
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validator = RegexValidator(message="hello")
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string, imports = MigrationWriter.serialize(validator)
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self.assertEqual(string, "django.core.validators.RegexValidator(message='hello')")
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self.serialize_round_trip(validator)
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validator = EmailValidator(message="hello") # Test with a subclass.
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string, imports = MigrationWriter.serialize(validator)
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self.assertEqual(string, "django.core.validators.EmailValidator(message='hello')")
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self.serialize_round_trip(validator)
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validator = deconstructible(path="custom.EmailValidator")(EmailValidator)(message="hello")
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string, imports = MigrationWriter.serialize(validator)
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self.assertEqual(string, "custom.EmailValidator(message='hello')")
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# Django fields
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self.assertSerializedFieldEqual(models.CharField(max_length=255))
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self.assertSerializedFieldEqual(models.TextField(null=True, blank=True))
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# Setting references
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self.assertSerializedEqual(SettingsReference(settings.AUTH_USER_MODEL, "AUTH_USER_MODEL"))
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self.assertSerializedResultEqual(
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SettingsReference("someapp.model", "AUTH_USER_MODEL"),
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(
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"settings.AUTH_USER_MODEL",
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set(["from django.conf import settings"]),
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)
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)
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self.assertSerializedResultEqual(
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((x, x * x) for x in range(3)),
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(
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"((0, 0), (1, 1), (2, 4))",
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set(),
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)
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)
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def test_simple_migration(self):
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"""
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Tests serializing a simple migration.
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"""
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fields = {
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'charfield': models.DateTimeField(default=datetime.datetime.utcnow),
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'datetimefield': models.DateTimeField(default=datetime.datetime.utcnow),
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}
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options = {
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'verbose_name': 'My model',
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'verbose_name_plural': 'My models',
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}
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migration = type(str("Migration"), (migrations.Migration,), {
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"operations": [
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migrations.CreateModel("MyModel", tuple(fields.items()), options, (models.Model,)),
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migrations.CreateModel("MyModel2", tuple(fields.items()), bases=(models.Model,)),
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migrations.CreateModel(name="MyModel3", fields=tuple(fields.items()), options=options, bases=(models.Model,)),
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migrations.DeleteModel("MyModel"),
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migrations.AddField("OtherModel", "datetimefield", fields["datetimefield"]),
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],
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"dependencies": [("testapp", "some_other_one")],
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})
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writer = MigrationWriter(migration)
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output = writer.as_string()
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# It should NOT be unicode.
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self.assertIsInstance(output, six.binary_type, "Migration as_string returned unicode")
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# We don't test the output formatting - that's too fragile.
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# Just make sure it runs for now, and that things look alright.
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result = self.safe_exec(output)
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self.assertIn("Migration", result)
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# In order to preserve compatibility with Python 3.2 unicode literals
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# prefix shouldn't be added to strings.
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tokens = tokenize.generate_tokens(six.StringIO(str(output)).readline)
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for token_type, token_source, (srow, scol), _, line in tokens:
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if token_type == tokenize.STRING:
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self.assertFalse(
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token_source.startswith('u'),
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"Unicode literal prefix found at %d:%d: %r" % (
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srow, scol, line.strip()
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)
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)
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def test_migration_path(self):
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test_apps = [
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'migrations.migrations_test_apps.normal',
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'migrations.migrations_test_apps.with_package_model',
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]
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base_dir = os.path.dirname(os.path.dirname(__file__))
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for app in test_apps:
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with self.modify_settings(INSTALLED_APPS={'append': app}):
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migration = migrations.Migration('0001_initial', app.split('.')[-1])
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expected_path = os.path.join(base_dir, *(app.split('.') + ['migrations', '0001_initial.py']))
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writer = MigrationWriter(migration)
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self.assertEqual(writer.path, expected_path)
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