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test_writer.py
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test_writer.py
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# encoding: utf8
from __future__ import unicode_literals
import datetime
import os
from django.core.validators import RegexValidator, EmailValidator
from django.db import models, migrations
from django.db.migrations.writer import MigrationWriter, SettingsReference
from django.test import TestCase
from django.conf import settings
from django.utils import six
from django.utils.deconstruct import deconstructible
from django.utils.translation import ugettext_lazy as _
class WriterTests(TestCase):
"""
Tests the migration writer (makes migration files from Migration instances)
"""
def safe_exec(self, string, value=None):
l = {}
try:
exec(string, globals(), l)
except Exception as e:
if value:
self.fail("Could not exec %r (from value %r): %s" % (string.strip(), value, e))
else:
self.fail("Could not exec %r: %s" % (string.strip(), e))
return l
def serialize_round_trip(self, value):
string, imports = MigrationWriter.serialize(value)
return self.safe_exec("%s\ntest_value_result = %s" % ("\n".join(imports), string), value)['test_value_result']
def assertSerializedEqual(self, value):
self.assertEqual(self.serialize_round_trip(value), value)
def assertSerializedResultEqual(self, value, target):
self.assertEqual(MigrationWriter.serialize(value), target)
def assertSerializedFieldEqual(self, value):
new_value = self.serialize_round_trip(value)
self.assertEqual(value.__class__, new_value.__class__)
self.assertEqual(value.max_length, new_value.max_length)
self.assertEqual(value.null, new_value.null)
self.assertEqual(value.unique, new_value.unique)
def test_serialize(self):
"""
Tests various different forms of the serializer.
This does not care about formatting, just that the parsed result is
correct, so we always exec() the result and check that.
"""
# Basic values
self.assertSerializedEqual(1)
self.assertSerializedEqual(None)
self.assertSerializedEqual(b"foobar")
self.assertSerializedEqual("föobár")
self.assertSerializedEqual({1: 2})
self.assertSerializedEqual(["a", 2, True, None])
self.assertSerializedEqual(set([2, 3, "eighty"]))
self.assertSerializedEqual({"lalalala": ["yeah", "no", "maybe"]})
self.assertSerializedEqual(_('Hello'))
# Functions
with six.assertRaisesRegex(self, ValueError, 'Cannot serialize function: lambda'):
self.assertSerializedEqual(lambda x: 42)
self.assertSerializedEqual(models.SET_NULL)
string, imports = MigrationWriter.serialize(models.SET(42))
self.assertEqual(string, 'models.SET(42)')
self.serialize_round_trip(models.SET(42))
# Datetime stuff
self.assertSerializedEqual(datetime.datetime.utcnow())
self.assertSerializedEqual(datetime.datetime.utcnow)
self.assertSerializedEqual(datetime.datetime.today())
self.assertSerializedEqual(datetime.datetime.today)
self.assertSerializedEqual(datetime.date.today())
self.assertSerializedEqual(datetime.date.today)
# Classes
validator = RegexValidator(message="hello")
string, imports = MigrationWriter.serialize(validator)
self.assertEqual(string, "django.core.validators.RegexValidator(message=%s)" % repr("hello"))
self.serialize_round_trip(validator)
validator = EmailValidator(message="hello") # Test with a subclass.
string, imports = MigrationWriter.serialize(validator)
self.assertEqual(string, "django.core.validators.EmailValidator(message=%s)" % repr("hello"))
self.serialize_round_trip(validator)
validator = deconstructible(path="custom.EmailValidator")(EmailValidator)(message="hello")
string, imports = MigrationWriter.serialize(validator)
self.assertEqual(string, "custom.EmailValidator(message=%s)" % repr("hello"))
# Django fields
self.assertSerializedFieldEqual(models.CharField(max_length=255))
self.assertSerializedFieldEqual(models.TextField(null=True, blank=True))
# Setting references
self.assertSerializedEqual(SettingsReference(settings.AUTH_USER_MODEL, "AUTH_USER_MODEL"))
self.assertSerializedResultEqual(
SettingsReference("someapp.model", "AUTH_USER_MODEL"),
(
"settings.AUTH_USER_MODEL",
set(["from django.conf import settings"]),
)
)
self.assertSerializedResultEqual(
((x, x*x) for x in range(3)),
(
"((0, 0), (1, 1), (2, 4))",
set(),
)
)
def test_simple_migration(self):
"""
Tests serializing a simple migration.
"""
fields = {
'charfield': models.DateTimeField(default=datetime.datetime.utcnow),
'datetimefield': models.DateTimeField(default=datetime.datetime.utcnow),
}
options = {
'verbose_name': 'My model',
'verbose_name_plural': 'My models',
}
migration = type(str("Migration"), (migrations.Migration,), {
"operations": [
migrations.CreateModel("MyModel", tuple(fields.items()), options, (models.Model,)),
migrations.CreateModel("MyModel2", tuple(fields.items()), bases=(models.Model,)),
migrations.CreateModel(name="MyModel3", fields=tuple(fields.items()), options=options, bases=(models.Model,)),
migrations.DeleteModel("MyModel"),
migrations.AddField("OtherModel", "datetimefield", fields["datetimefield"]),
],
"dependencies": [("testapp", "some_other_one")],
})
writer = MigrationWriter(migration)
output = writer.as_string()
# It should NOT be unicode.
self.assertIsInstance(output, six.binary_type, "Migration as_string returned unicode")
# We don't test the output formatting - that's too fragile.
# Just make sure it runs for now, and that things look alright.
result = self.safe_exec(output)
self.assertIn("Migration", result)
def test_migration_path(self):
test_apps = [
'migrations.migrations_test_apps.normal',
'migrations.migrations_test_apps.with_package_model',
]
base_dir = os.path.dirname(os.path.dirname(__file__))
for app in test_apps:
with self.modify_settings(INSTALLED_APPS={'append': app}):
migration = migrations.Migration('0001_initial', app.split('.')[-1])
expected_path = os.path.join(base_dir, *(app.split('.') + ['migrations', '0001_initial.py']))
writer = MigrationWriter(migration)
self.assertEqual(writer.path, expected_path)