[1.7.x] Simplified indexes tests.

from unittest import skipUnless

from django.core.management.color import no_style

from django.db import connections, DEFAULT_DB_ALIAS

from django.db import connection

from django.test import TestCase

from .models import Article, IndexTogetherSingleList

class IndexesTests(TestCase):

    def test_index_together(self):

        connection = connections[DEFAULT_DB_ALIAS]

        index_sql = connection.creation.sql_indexes_for_model(Article, no_style())

        self.assertEqual(len(index_sql), 1)

    def test_index_together_single_list(self):

        # Test for using index_together with a single list (#22172)

        connection = connections[DEFAULT_DB_ALIAS]

        index_sql = connection.creation.sql_indexes_for_model(IndexTogetherSingleList, no_style())

        self.assertEqual(len(index_sql), 1)

    @skipUnless(connections[DEFAULT_DB_ALIAS].vendor == 'postgresql',

    @skipUnless(connection.vendor == 'postgresql',

        "This is a postgresql-specific issue")

    def test_postgresql_text_indexes(self):

        """Test creation of PostgreSQL-specific text indexes (#12234)"""

        from .models import IndexedArticle

        connection = connections[DEFAULT_DB_ALIAS]

        index_sql = connection.creation.sql_indexes_for_model(IndexedArticle, no_style())

        self.assertEqual(len(index_sql), 5)

        self.assertIn('("headline" varchar_pattern_ops)', index_sql[1])