Added tests for some sql_* management commands

from django.db import models

from django.utils.encoding import python_2_unicode_compatible

@python_2_unicode_compatible

class Book(models.Model):

    title = models.CharField(max_length=100, db_index=True)

from __future__ import unicode_literals

from django.core.management.color import no_style

from django.core.management.sql import (sql_create, sql_delete, sql_indexes,

    sql_all)

from django.db import connections, DEFAULT_DB_ALIAS, models

from django.test import TestCase

from django.utils import six

# See also regressiontests/initial_sql_regress for 'custom_sql_for_model' tests

class SQLCommandsTestCase(TestCase):

    """Tests for several functions in django/core/management/sql.py"""

    def test_sql_create(self):

        app = models.get_app('commands_sql')

        output = sql_create(app, no_style(), connections[DEFAULT_DB_ALIAS])

        six.assertRegex(self, output[0], r'^CREATE TABLE .commands_sql_book.*')

    def test_sql_delete(self):

        app = models.get_app('commands_sql')

        output = sql_delete(app, no_style(), connections[DEFAULT_DB_ALIAS])

        six.assertRegex(self, output[0], r'^DROP TABLE .commands_sql_book.*')

    def test_sql_indexes(self):

        app = models.get_app('commands_sql')

        output = sql_indexes(app, no_style(), connections[DEFAULT_DB_ALIAS])

        # PostgreSQL creates two indexes

        self.assertIn(len(output), [1, 2])

        self.assertTrue(output[0].startswith("CREATE INDEX"))

    def test_sql_all(self):

        app = models.get_app('commands_sql')

        output = sql_all(app, no_style(), connections[DEFAULT_DB_ALIAS])

        # PostgreSQL creates two indexes

        self.assertIn(len(output), [2, 3])

        self.assertTrue(output[0].startswith('CREATE TABLE'))

        self.assertTrue(output[1].startswith('CREATE INDEX'))