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415 lines
17 KiB
Python
415 lines
17 KiB
Python
import warnings
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from datetime import datetime
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from django.core.paginator import (
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EmptyPage, InvalidPage, PageNotAnInteger, Paginator,
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UnorderedObjectListWarning,
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)
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from django.test import SimpleTestCase, TestCase
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from .custom import ValidAdjacentNumsPaginator
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from .models import Article
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class PaginationTests(SimpleTestCase):
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"""
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Tests for the Paginator and Page classes.
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"""
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def check_paginator(self, params, output):
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"""
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Helper method that instantiates a Paginator object from the passed
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params and then checks that its attributes match the passed output.
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"""
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count, num_pages, page_range = output
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paginator = Paginator(*params)
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self.check_attribute('count', paginator, count, params)
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self.check_attribute('num_pages', paginator, num_pages, params)
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self.check_attribute('page_range', paginator, page_range, params, coerce=list)
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def check_attribute(self, name, paginator, expected, params, coerce=None):
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"""
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Helper method that checks a single attribute and gives a nice error
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message upon test failure.
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"""
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got = getattr(paginator, name)
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if coerce is not None:
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got = coerce(got)
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self.assertEqual(
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expected, got,
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"For '%s', expected %s but got %s. Paginator parameters were: %s"
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% (name, expected, got, params)
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)
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def test_paginator(self):
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"""
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Tests the paginator attributes using varying inputs.
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"""
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nine = [1, 2, 3, 4, 5, 6, 7, 8, 9]
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ten = nine + [10]
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eleven = ten + [11]
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tests = (
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# Each item is two tuples:
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# First tuple is Paginator parameters - object_list, per_page,
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# orphans, and allow_empty_first_page.
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# Second tuple is resulting Paginator attributes - count,
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# num_pages, and page_range.
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# Ten items, varying orphans, no empty first page.
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((ten, 4, 0, False), (10, 3, [1, 2, 3])),
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((ten, 4, 1, False), (10, 3, [1, 2, 3])),
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((ten, 4, 2, False), (10, 2, [1, 2])),
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((ten, 4, 5, False), (10, 2, [1, 2])),
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((ten, 4, 6, False), (10, 1, [1])),
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# Ten items, varying orphans, allow empty first page.
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((ten, 4, 0, True), (10, 3, [1, 2, 3])),
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((ten, 4, 1, True), (10, 3, [1, 2, 3])),
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((ten, 4, 2, True), (10, 2, [1, 2])),
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((ten, 4, 5, True), (10, 2, [1, 2])),
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((ten, 4, 6, True), (10, 1, [1])),
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# One item, varying orphans, no empty first page.
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(([1], 4, 0, False), (1, 1, [1])),
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(([1], 4, 1, False), (1, 1, [1])),
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(([1], 4, 2, False), (1, 1, [1])),
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# One item, varying orphans, allow empty first page.
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(([1], 4, 0, True), (1, 1, [1])),
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(([1], 4, 1, True), (1, 1, [1])),
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(([1], 4, 2, True), (1, 1, [1])),
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# Zero items, varying orphans, no empty first page.
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(([], 4, 0, False), (0, 0, [])),
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(([], 4, 1, False), (0, 0, [])),
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(([], 4, 2, False), (0, 0, [])),
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# Zero items, varying orphans, allow empty first page.
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(([], 4, 0, True), (0, 1, [1])),
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(([], 4, 1, True), (0, 1, [1])),
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(([], 4, 2, True), (0, 1, [1])),
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# Number if items one less than per_page.
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(([], 1, 0, True), (0, 1, [1])),
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(([], 1, 0, False), (0, 0, [])),
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(([1], 2, 0, True), (1, 1, [1])),
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((nine, 10, 0, True), (9, 1, [1])),
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# Number if items equal to per_page.
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(([1], 1, 0, True), (1, 1, [1])),
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(([1, 2], 2, 0, True), (2, 1, [1])),
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((ten, 10, 0, True), (10, 1, [1])),
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# Number if items one more than per_page.
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(([1, 2], 1, 0, True), (2, 2, [1, 2])),
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(([1, 2, 3], 2, 0, True), (3, 2, [1, 2])),
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((eleven, 10, 0, True), (11, 2, [1, 2])),
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# Number if items one more than per_page with one orphan.
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(([1, 2], 1, 1, True), (2, 1, [1])),
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(([1, 2, 3], 2, 1, True), (3, 1, [1])),
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((eleven, 10, 1, True), (11, 1, [1])),
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# Non-integer inputs
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((ten, '4', 1, False), (10, 3, [1, 2, 3])),
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((ten, '4', 1, False), (10, 3, [1, 2, 3])),
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((ten, 4, '1', False), (10, 3, [1, 2, 3])),
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((ten, 4, '1', False), (10, 3, [1, 2, 3])),
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)
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for params, output in tests:
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self.check_paginator(params, output)
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def test_invalid_page_number(self):
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"""
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Invalid page numbers result in the correct exception being raised.
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"""
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paginator = Paginator([1, 2, 3], 2)
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with self.assertRaises(InvalidPage):
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paginator.page(3)
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with self.assertRaises(PageNotAnInteger):
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paginator.validate_number(None)
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with self.assertRaises(PageNotAnInteger):
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paginator.validate_number('x')
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with self.assertRaises(PageNotAnInteger):
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paginator.validate_number(1.2)
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def test_float_integer_page(self):
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paginator = Paginator([1, 2, 3], 2)
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self.assertEqual(paginator.validate_number(1.0), 1)
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def test_no_content_allow_empty_first_page(self):
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# With no content and allow_empty_first_page=True, 1 is a valid page number
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paginator = Paginator([], 2)
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self.assertEqual(paginator.validate_number(1), 1)
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def test_paginate_misc_classes(self):
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class CountContainer:
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def count(self):
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return 42
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# Paginator can be passed other objects with a count() method.
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paginator = Paginator(CountContainer(), 10)
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self.assertEqual(42, paginator.count)
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self.assertEqual(5, paginator.num_pages)
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self.assertEqual([1, 2, 3, 4, 5], list(paginator.page_range))
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# Paginator can be passed other objects that implement __len__.
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class LenContainer:
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def __len__(self):
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return 42
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paginator = Paginator(LenContainer(), 10)
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self.assertEqual(42, paginator.count)
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self.assertEqual(5, paginator.num_pages)
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self.assertEqual([1, 2, 3, 4, 5], list(paginator.page_range))
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def test_count_does_not_silence_attribute_error(self):
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class AttributeErrorContainer:
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def count(self):
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raise AttributeError('abc')
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with self.assertRaisesMessage(AttributeError, 'abc'):
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Paginator(AttributeErrorContainer(), 10).count
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def test_count_does_not_silence_type_error(self):
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class TypeErrorContainer:
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def count(self):
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raise TypeError('abc')
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with self.assertRaisesMessage(TypeError, 'abc'):
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Paginator(TypeErrorContainer(), 10).count
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def check_indexes(self, params, page_num, indexes):
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"""
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Helper method that instantiates a Paginator object from the passed
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params and then checks that the start and end indexes of the passed
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page_num match those given as a 2-tuple in indexes.
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"""
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paginator = Paginator(*params)
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if page_num == 'first':
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page_num = 1
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elif page_num == 'last':
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page_num = paginator.num_pages
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page = paginator.page(page_num)
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start, end = indexes
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msg = ("For %s of page %s, expected %s but got %s. Paginator parameters were: %s")
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self.assertEqual(start, page.start_index(), msg % ('start index', page_num, start, page.start_index(), params))
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self.assertEqual(end, page.end_index(), msg % ('end index', page_num, end, page.end_index(), params))
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def test_page_indexes(self):
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"""
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Paginator pages have the correct start and end indexes.
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"""
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ten = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
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tests = (
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# Each item is three tuples:
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# First tuple is Paginator parameters - object_list, per_page,
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# orphans, and allow_empty_first_page.
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# Second tuple is the start and end indexes of the first page.
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# Third tuple is the start and end indexes of the last page.
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# Ten items, varying per_page, no orphans.
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((ten, 1, 0, True), (1, 1), (10, 10)),
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((ten, 2, 0, True), (1, 2), (9, 10)),
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((ten, 3, 0, True), (1, 3), (10, 10)),
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((ten, 5, 0, True), (1, 5), (6, 10)),
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# Ten items, varying per_page, with orphans.
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((ten, 1, 1, True), (1, 1), (9, 10)),
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((ten, 1, 2, True), (1, 1), (8, 10)),
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((ten, 3, 1, True), (1, 3), (7, 10)),
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((ten, 3, 2, True), (1, 3), (7, 10)),
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((ten, 3, 4, True), (1, 3), (4, 10)),
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((ten, 5, 1, True), (1, 5), (6, 10)),
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((ten, 5, 2, True), (1, 5), (6, 10)),
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((ten, 5, 5, True), (1, 10), (1, 10)),
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# One item, varying orphans, no empty first page.
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(([1], 4, 0, False), (1, 1), (1, 1)),
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(([1], 4, 1, False), (1, 1), (1, 1)),
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(([1], 4, 2, False), (1, 1), (1, 1)),
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# One item, varying orphans, allow empty first page.
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(([1], 4, 0, True), (1, 1), (1, 1)),
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(([1], 4, 1, True), (1, 1), (1, 1)),
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(([1], 4, 2, True), (1, 1), (1, 1)),
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# Zero items, varying orphans, allow empty first page.
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(([], 4, 0, True), (0, 0), (0, 0)),
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(([], 4, 1, True), (0, 0), (0, 0)),
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(([], 4, 2, True), (0, 0), (0, 0)),
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)
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for params, first, last in tests:
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self.check_indexes(params, 'first', first)
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self.check_indexes(params, 'last', last)
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# When no items and no empty first page, we should get EmptyPage error.
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with self.assertRaises(EmptyPage):
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self.check_indexes(([], 4, 0, False), 1, None)
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with self.assertRaises(EmptyPage):
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self.check_indexes(([], 4, 1, False), 1, None)
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with self.assertRaises(EmptyPage):
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self.check_indexes(([], 4, 2, False), 1, None)
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def test_page_sequence(self):
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"""
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A paginator page acts like a standard sequence.
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"""
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eleven = 'abcdefghijk'
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page2 = Paginator(eleven, per_page=5, orphans=1).page(2)
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self.assertEqual(len(page2), 6)
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self.assertIn('k', page2)
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self.assertNotIn('a', page2)
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self.assertEqual(''.join(page2), 'fghijk')
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self.assertEqual(''.join(reversed(page2)), 'kjihgf')
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def test_get_page_hook(self):
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"""
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A Paginator subclass can use the ``_get_page`` hook to
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return an alternative to the standard Page class.
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"""
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eleven = 'abcdefghijk'
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paginator = ValidAdjacentNumsPaginator(eleven, per_page=6)
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page1 = paginator.page(1)
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page2 = paginator.page(2)
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self.assertIsNone(page1.previous_page_number())
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self.assertEqual(page1.next_page_number(), 2)
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self.assertEqual(page2.previous_page_number(), 1)
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self.assertIsNone(page2.next_page_number())
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def test_page_range_iterator(self):
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"""
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Paginator.page_range should be an iterator.
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"""
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self.assertIsInstance(Paginator([1, 2, 3], 2).page_range, type(range(0)))
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def test_get_page(self):
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"""
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Paginator.get_page() returns a valid page even with invalid page
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arguments.
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"""
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paginator = Paginator([1, 2, 3], 2)
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page = paginator.get_page(1)
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self.assertEqual(page.number, 1)
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self.assertEqual(page.object_list, [1, 2])
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# An empty page returns the last page.
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self.assertEqual(paginator.get_page(3).number, 2)
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# Non-integer page returns the first page.
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self.assertEqual(paginator.get_page(None).number, 1)
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def test_get_page_empty_object_list(self):
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"""Paginator.get_page() with an empty object_list."""
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paginator = Paginator([], 2)
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# An empty page returns the last page.
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self.assertEqual(paginator.get_page(1).number, 1)
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self.assertEqual(paginator.get_page(2).number, 1)
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# Non-integer page returns the first page.
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self.assertEqual(paginator.get_page(None).number, 1)
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def test_get_page_empty_object_list_and_allow_empty_first_page_false(self):
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"""
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Paginator.get_page() raises EmptyPage if allow_empty_first_page=False
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and object_list is empty.
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"""
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paginator = Paginator([], 2, allow_empty_first_page=False)
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with self.assertRaises(EmptyPage):
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paginator.get_page(1)
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def test_paginator_iteration(self):
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paginator = Paginator([1, 2, 3], 2)
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page_iterator = iter(paginator)
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for page, expected in enumerate(([1, 2], [3]), start=1):
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with self.subTest(page=page):
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self.assertEqual(expected, list(next(page_iterator)))
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class ModelPaginationTests(TestCase):
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"""
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Test pagination with Django model instances
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"""
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@classmethod
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def setUpTestData(cls):
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# Prepare a list of objects for pagination.
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for x in range(1, 10):
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a = Article(headline='Article %s' % x, pub_date=datetime(2005, 7, 29))
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a.save()
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def test_first_page(self):
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paginator = Paginator(Article.objects.order_by('id'), 5)
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p = paginator.page(1)
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self.assertEqual("<Page 1 of 2>", str(p))
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self.assertQuerysetEqual(p.object_list, [
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"<Article: Article 1>",
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"<Article: Article 2>",
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"<Article: Article 3>",
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"<Article: Article 4>",
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"<Article: Article 5>"
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])
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self.assertTrue(p.has_next())
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self.assertFalse(p.has_previous())
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self.assertTrue(p.has_other_pages())
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self.assertEqual(2, p.next_page_number())
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with self.assertRaises(InvalidPage):
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p.previous_page_number()
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self.assertEqual(1, p.start_index())
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self.assertEqual(5, p.end_index())
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def test_last_page(self):
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paginator = Paginator(Article.objects.order_by('id'), 5)
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p = paginator.page(2)
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self.assertEqual("<Page 2 of 2>", str(p))
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self.assertQuerysetEqual(p.object_list, [
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"<Article: Article 6>",
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"<Article: Article 7>",
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"<Article: Article 8>",
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"<Article: Article 9>"
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])
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self.assertFalse(p.has_next())
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self.assertTrue(p.has_previous())
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self.assertTrue(p.has_other_pages())
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with self.assertRaises(InvalidPage):
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p.next_page_number()
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self.assertEqual(1, p.previous_page_number())
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self.assertEqual(6, p.start_index())
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self.assertEqual(9, p.end_index())
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def test_page_getitem(self):
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"""
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Tests proper behavior of a paginator page __getitem__ (queryset
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evaluation, slicing, exception raised).
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"""
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paginator = Paginator(Article.objects.order_by('id'), 5)
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p = paginator.page(1)
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# Make sure object_list queryset is not evaluated by an invalid __getitem__ call.
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# (this happens from the template engine when using eg: {% page_obj.has_previous %})
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self.assertIsNone(p.object_list._result_cache)
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msg = 'Page indices must be integers or slices, not str.'
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with self.assertRaisesMessage(TypeError, msg):
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p['has_previous']
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self.assertIsNone(p.object_list._result_cache)
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self.assertNotIsInstance(p.object_list, list)
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# Make sure slicing the Page object with numbers and slice objects work.
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self.assertEqual(p[0], Article.objects.get(headline='Article 1'))
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self.assertQuerysetEqual(p[slice(2)], [
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"<Article: Article 1>",
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"<Article: Article 2>",
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]
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)
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# After __getitem__ is called, object_list is a list
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self.assertIsInstance(p.object_list, list)
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def test_paginating_unordered_queryset_raises_warning(self):
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msg = (
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"Pagination may yield inconsistent results with an unordered "
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"object_list: <class 'pagination.models.Article'> QuerySet."
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)
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with self.assertWarnsMessage(UnorderedObjectListWarning, msg) as cm:
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Paginator(Article.objects.all(), 5)
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# The warning points at the Paginator caller (i.e. the stacklevel
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# is appropriate).
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self.assertEqual(cm.filename, __file__)
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def test_paginating_empty_queryset_does_not_warn(self):
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with warnings.catch_warnings(record=True) as recorded:
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Paginator(Article.objects.none(), 5)
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self.assertEqual(len(recorded), 0)
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def test_paginating_unordered_object_list_raises_warning(self):
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"""
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Unordered object list warning with an object that has an ordered
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attribute but not a model attribute.
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"""
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class ObjectList:
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ordered = False
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object_list = ObjectList()
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msg = (
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"Pagination may yield inconsistent results with an unordered "
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"object_list: {!r}.".format(object_list)
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)
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with self.assertWarnsMessage(UnorderedObjectListWarning, msg):
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Paginator(object_list, 5)
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