Reorganized comparison db function tests.

tests/db_functions/test_cast.py

@@ -1,81 +0,0 @@
-import datetime
-import decimal
-import unittest
-
-from django.db import connection, models
-from django.db.models import Avg
-from django.db.models.expressions import Value
-from django.db.models.functions import Cast
-from django.test import (
-    TestCase, ignore_warnings, override_settings, skipUnlessDBFeature,
-)
-
-from .models import Author
-
-
-class CastTests(TestCase):
-    @classmethod
-    def setUpTestData(self):
-        Author.objects.create(name='Bob', age=1, alias='1')
-
-    def test_cast_from_value(self):
-        numbers = Author.objects.annotate(cast_integer=Cast(Value('0'), models.IntegerField()))
-        self.assertEqual(numbers.get().cast_integer, 0)
-
-    def test_cast_from_field(self):
-        numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField(max_length=255)),)
-        self.assertEqual(numbers.get().cast_string, '1')
-
-    def test_cast_to_char_field_without_max_length(self):
-        numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField()))
-        self.assertEqual(numbers.get().cast_string, '1')
-
-    # Silence "Truncated incorrect CHAR(1) value: 'Bob'".
-    @ignore_warnings(module='django.db.backends.mysql.base')
-    @skipUnlessDBFeature('supports_cast_with_precision')
-    def test_cast_to_char_field_with_max_length(self):
-        names = Author.objects.annotate(cast_string=Cast('name', models.CharField(max_length=1)))
-        self.assertEqual(names.get().cast_string, 'B')
-
-    def test_cast_to_integer(self):
-        for field_class in (
-            models.AutoField,
-            models.BigAutoField,
-            models.IntegerField,
-            models.BigIntegerField,
-            models.SmallIntegerField,
-            models.PositiveIntegerField,
-            models.PositiveSmallIntegerField,
-        ):
-            with self.subTest(field_class=field_class):
-                numbers = Author.objects.annotate(cast_int=Cast('alias', field_class()))
-                self.assertEqual(numbers.get().cast_int, 1)
-
-    def test_cast_from_python_to_date(self):
-        today = datetime.date.today()
-        dates = Author.objects.annotate(cast_date=Cast(today, models.DateField()))
-        self.assertEqual(dates.get().cast_date, today)
-
-    def test_cast_from_python_to_datetime(self):
-        now = datetime.datetime.now()
-        dates = Author.objects.annotate(cast_datetime=Cast(now, models.DateTimeField()))
-        self.assertEqual(dates.get().cast_datetime, now)
-
-    def test_cast_from_python(self):
-        numbers = Author.objects.annotate(cast_float=Cast(decimal.Decimal(0.125), models.FloatField()))
-        cast_float = numbers.get().cast_float
-        self.assertIsInstance(cast_float, float)
-        self.assertEqual(cast_float, 0.125)
-
-    @unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL test')
-    @override_settings(DEBUG=True)
-    def test_expression_wrapped_with_parentheses_on_postgresql(self):
-        """
-        The SQL for the Cast expression is wrapped with parentheses in case
-        it's a complex expression.
-        """
-        list(Author.objects.annotate(cast_float=Cast(Avg('age'), models.FloatField())))
-        self.assertIn('(AVG("db_functions_author"."age"))::double precision', connection.queries[-1]['sql'])
-
-    def test_cast_to_text_field(self):
-        self.assertEqual(Author.objects.values_list(Cast('age', models.TextField()), flat=True).get(), '1')