59 lines
2.2 KiB
Python
59 lines
2.2 KiB
Python
from django.db import connection
|
|
from django.db.models import Value
|
|
from django.db.models.functions import Length, LPad, RPad
|
|
from django.test import TestCase
|
|
|
|
from ..models import Author
|
|
|
|
|
|
class PadTests(TestCase):
|
|
def test_pad(self):
|
|
Author.objects.create(name="John", alias="j")
|
|
none_value = (
|
|
"" if connection.features.interprets_empty_strings_as_nulls else None
|
|
)
|
|
tests = (
|
|
(LPad("name", 7, Value("xy")), "xyxJohn"),
|
|
(RPad("name", 7, Value("xy")), "Johnxyx"),
|
|
(LPad("name", 6, Value("x")), "xxJohn"),
|
|
(RPad("name", 6, Value("x")), "Johnxx"),
|
|
# The default pad string is a space.
|
|
(LPad("name", 6), " John"),
|
|
(RPad("name", 6), "John "),
|
|
# If string is longer than length it is truncated.
|
|
(LPad("name", 2), "Jo"),
|
|
(RPad("name", 2), "Jo"),
|
|
(LPad("name", 0), ""),
|
|
(RPad("name", 0), ""),
|
|
(LPad("name", None), none_value),
|
|
(RPad("name", None), none_value),
|
|
(LPad(Value(None), 1), none_value),
|
|
(RPad(Value(None), 1), none_value),
|
|
(LPad("goes_by", 1), none_value),
|
|
(RPad("goes_by", 1), none_value),
|
|
)
|
|
for function, padded_name in tests:
|
|
with self.subTest(function=function):
|
|
authors = Author.objects.annotate(padded_name=function)
|
|
self.assertQuerysetEqual(
|
|
authors, [padded_name], lambda a: a.padded_name, ordered=False
|
|
)
|
|
|
|
def test_pad_negative_length(self):
|
|
for function in (LPad, RPad):
|
|
with self.subTest(function=function):
|
|
with self.assertRaisesMessage(
|
|
ValueError, "'length' must be greater or equal to 0."
|
|
):
|
|
function("name", -1)
|
|
|
|
def test_combined_with_length(self):
|
|
Author.objects.create(name="Rhonda", alias="john_smith")
|
|
Author.objects.create(name="♥♣♠", alias="bytes")
|
|
authors = Author.objects.annotate(filled=LPad("name", Length("alias")))
|
|
self.assertQuerysetEqual(
|
|
authors.order_by("alias"),
|
|
[" ♥♣♠", " Rhonda"],
|
|
lambda a: a.filled,
|
|
)
|