DRY a redundant django-pytest class

TestSearch

class TestSearch:
    """
    Non-regresion tests #27 : non error if a search do not return products
    """
    CLIENT = Client()

    WITNESS = {
        'templates': [
            'ersatz/result.html',
            'base.html',
            'omega/searchform.html',
        ]
    }
    RESPONSE_EMPTY =  {'error': API['EMPTY'],'status': False}
    RESPONSE_NO_PROD =  {
        'error': API['NO_PROD'].format('foobar'),
        'status': False,
    }

    def fake_get_search_empty_context(self, request):
        """ ersatz.views.toolbox.get_search_context() fake function """
        return self.RESPONSE_EMPTY

    def fake_get_search_no_product_context(self, request):
        """ ersatz.views.toolbox.get_search_context() fake function """
        return self.RESPONSE_NO_PROD

    def test_empty_search(self, monkeypatch):
        self.WITNESS['response'] = self.RESPONSE_EMPTY

        monkeypatch.setattr('ersatz.views.toolbox.get_search_context', self.fake_get_search_empty_context)
        response = self.CLIENT.get('/ersatz/search/')

        assert response.status_code == 200
        assert self.WITNESS['templates'] == [t.name for t in response.templates]
        assert self.WITNESS['response']['error'] == response.context['error']

    def test_no_product_search(self, monkeypatch):
        self.WITNESS['response'] = self.RESPONSE_NO_PROD

        monkeypatch.setattr('ersatz.views.toolbox.get_search_context', self.fake_get_search_no_product_context)
        response = self.CLIENT.get('/ersatz/search/', {'s':'foobar'})

        assert response.status_code == 200
        assert self.WITNESS['templates'] == [t.name for t in response.templates]
        assert self.WITNESS['response']['error'] == response.context['error']