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98 lines
3.9 KiB
Python
98 lines
3.9 KiB
Python
# encoding: utf8
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from __future__ import unicode_literals
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import datetime
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from django.utils import six
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from django.test import TestCase
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from django.db.migrations.writer import MigrationWriter
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from django.db import models, migrations
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from django.utils.translation import ugettext_lazy as _
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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 assertSerializedIs(self, value):
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self.assertIs(self.serialize_round_trip(value), value)
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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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self.assertSerializedEqual("föobár")
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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.date.today())
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self.assertSerializedEqual(datetime.date.today)
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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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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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migration = type(str("Migration"), (migrations.Migration,), {
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"operations": [
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migrations.DeleteModel("MyModel"),
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migrations.AddField("OtherModel", "field_name", models.DateTimeField(default=datetime.datetime.utcnow))
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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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