def enable(self):
        # Keep this code at the beginning to leave the settings unchanged
        # in case it raises an exception because INSTALLED_APPS is invalid.
        if 'INSTALLED_APPS' in self.options:
            try:
                apps.set_installed_apps(self.options['INSTALLED_APPS'])
            except Exception:
                apps.unset_installed_apps()
                raise
        override = UserSettingsHolder(settings._wrapped)
        for key, new_value in self.options.items():
            setattr(override, key, new_value)
        self.wrapped = settings._wrapped
        settings._wrapped = override
        for key, new_value in self.options.items():
            setting_changed.send(sender=settings._wrapped.__class__,
                                 setting=key, value=new_value, enter=True) 

def enable(self):
        # Keep this code at the beginning to leave the settings unchanged
        # in case it raises an exception because INSTALLED_APPS is invalid.
        if 'INSTALLED_APPS' in self.options:
            try:
                apps.set_installed_apps(self.options['INSTALLED_APPS'])
            except Exception:
                apps.unset_installed_apps()
                raise
        override = UserSettingsHolder(settings._wrapped)
        for key, new_value in self.options.items():
            setattr(override, key, new_value)
        self.wrapped = settings._wrapped
        settings._wrapped = override
        for key, new_value in self.options.items():
            setting_changed.send(sender=settings._wrapped.__class__,
                                 setting=key, value=new_value, enter=True) 

def enable(self):
        # Keep this code at the beginning to leave the settings unchanged
        # in case it raises an exception because INSTALLED_APPS is invalid.
        if 'INSTALLED_APPS' in self.options:
            try:
                apps.set_installed_apps(self.options['INSTALLED_APPS'])
            except Exception:
                apps.unset_installed_apps()
                raise
        override = UserSettingsHolder(settings._wrapped)
        for key, new_value in self.options.items():
            setattr(override, key, new_value)
        self.wrapped = settings._wrapped
        settings._wrapped = override
        for key, new_value in self.options.items():
            setting_changed.send(sender=settings._wrapped.__class__,
                                 setting=key, value=new_value, enter=True) 

def enable(self):
        # Keep this code at the beginning to leave the settings unchanged
        # in case it raises an exception because INSTALLED_APPS is invalid.
        if 'INSTALLED_APPS' in self.options:
            try:
                apps.set_installed_apps(self.options['INSTALLED_APPS'])
            except Exception:
                apps.unset_installed_apps()
                raise
        override = UserSettingsHolder(settings._wrapped)
        for key, new_value in self.options.items():
            setattr(override, key, new_value)
        self.wrapped = settings._wrapped
        settings._wrapped = override
        for key, new_value in self.options.items():
            setting_changed.send(sender=settings._wrapped.__class__,
                                 setting=key, value=new_value, enter=True) 

def enable(self):
        # Keep this code at the beginning to leave the settings unchanged
        # in case it raises an exception because INSTALLED_APPS is invalid.
        if 'INSTALLED_APPS' in self.options:
            try:
                apps.set_installed_apps(self.options['INSTALLED_APPS'])
            except Exception:
                apps.unset_installed_apps()
                raise
        override = UserSettingsHolder(settings._wrapped)
        for key, new_value in self.options.items():
            setattr(override, key, new_value)
        self.wrapped = settings._wrapped
        settings._wrapped = override
        for key, new_value in self.options.items():
            setting_changed.send(sender=settings._wrapped.__class__,
                                 setting=key, value=new_value, enter=True) 

def enable(self):
        # Keep this code at the beginning to leave the settings unchanged
        # in case it raises an exception because INSTALLED_APPS is invalid.
        if 'INSTALLED_APPS' in self.options:
            try:
                apps.set_installed_apps(self.options['INSTALLED_APPS'])
            except Exception:
                apps.unset_installed_apps()
                raise
        override = UserSettingsHolder(settings._wrapped)
        for key, new_value in self.options.items():
            setattr(override, key, new_value)
        self.wrapped = settings._wrapped
        settings._wrapped = override
        for key, new_value in self.options.items():
            setting_changed.send(sender=settings._wrapped.__class__,
                                 setting=key, value=new_value, enter=True) 

def setup_databases(self, **kwargs):
        # Look for test models
        test_apps = set()
        for package in self.test_packages:
            if find_spec('.models', package):
                test_apps.add(package)
        # Add test apps with models to INSTALLED_APPS that aren't already there
        new_installed = settings.INSTALLED_APPS + tuple(ta for ta in test_apps if ta not in settings.INSTALLED_APPS)
        apps.set_installed_apps(new_installed)
        return super().setup_databases(**kwargs) 

def test_PG_EXTRA_SEARCH_PATHS(self):
        del apps.all_models['django_tenants']
        c = connection.cursor()
        c.execute('DROP SCHEMA {0} CASCADE; CREATE SCHEMA {0};'.format(
            get_public_schema_name()
        ))
        apps.set_installed_apps(['customers', 'django_tenants'])