135 lines
5.3 KiB
Python
135 lines
5.3 KiB
Python
from __future__ import absolute_import, unicode_literals
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from datetime import datetime
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from django.core.paginator import Paginator, InvalidPage, EmptyPage
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from django.test import TestCase
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from django.utils import six
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from .models import Article
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class CountContainer(object):
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def count(self):
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return 42
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class LenContainer(object):
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def __len__(self):
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return 42
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class PaginationTests(TestCase):
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def setUp(self):
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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_paginator(self):
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paginator = Paginator(Article.objects.all(), 5)
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self.assertEqual(9, paginator.count)
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self.assertEqual(2, paginator.num_pages)
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self.assertEqual([1, 2], list(paginator.page_range))
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def test_first_page(self):
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paginator = Paginator(Article.objects.all(), 5)
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p = paginator.page(1)
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self.assertEqual("<Page 1 of 2>", six.text_type(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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)
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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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self.assertRaises(InvalidPage, 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.all(), 5)
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p = paginator.page(2)
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self.assertEqual("<Page 2 of 2>", six.text_type(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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)
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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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self.assertRaises(InvalidPage, 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_empty_page(self):
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paginator = Paginator(Article.objects.all(), 5)
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self.assertRaises(EmptyPage, paginator.page, 0)
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self.assertRaises(EmptyPage, paginator.page, 3)
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# Empty paginators with allow_empty_first_page=True.
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paginator = Paginator(Article.objects.filter(id=0), 5, allow_empty_first_page=True)
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self.assertEqual(0, paginator.count)
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self.assertEqual(1, paginator.num_pages)
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self.assertEqual([1], list(paginator.page_range))
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# Empty paginators with allow_empty_first_page=False.
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paginator = Paginator(Article.objects.filter(id=0), 5, allow_empty_first_page=False)
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self.assertEqual(0, paginator.count)
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self.assertEqual(0, paginator.num_pages)
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self.assertEqual([], list(paginator.page_range))
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def test_invalid_page(self):
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paginator = Paginator(Article.objects.all(), 5)
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self.assertRaises(InvalidPage, paginator.page, 7)
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def test_orphans(self):
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# Add a few more records to test out the orphans feature.
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for x in range(10, 13):
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Article(headline="Article %s" % x, pub_date=datetime(2006, 10, 6)).save()
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# With orphans set to 3 and 10 items per page, we should get all 12 items on a single page.
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paginator = Paginator(Article.objects.all(), 10, orphans=3)
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self.assertEqual(1, paginator.num_pages)
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# With orphans only set to 1, we should get two pages.
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paginator = Paginator(Article.objects.all(), 10, orphans=1)
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self.assertEqual(2, paginator.num_pages)
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def test_paginate_list(self):
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# Paginators work with regular lists/tuples, too -- not just with QuerySets.
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paginator = Paginator([1, 2, 3, 4, 5, 6, 7, 8, 9], 3)
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self.assertEqual(9, paginator.count)
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self.assertEqual(3, paginator.num_pages)
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self.assertEqual([1, 2, 3], list(paginator.page_range))
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p = paginator.page(2)
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self.assertEqual("<Page 2 of 3>", six.text_type(p))
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self.assertEqual([4, 5, 6], p.object_list)
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self.assertTrue(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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self.assertEqual(3, p.next_page_number())
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self.assertEqual(1, p.previous_page_number())
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self.assertEqual(4, p.start_index())
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self.assertEqual(6, p.end_index())
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def test_paginate_misc_classes(self):
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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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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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