Refs django#10941 -- Added helper and refactored tests for querystrin…

…g template tag.

Thank you Sarah Boyce for the review and suggestions.

tests/template_tests/syntax_tests/test_querystring.py

@@ -6,88 +6,77 @@
 
 
 class QueryStringTagTests(SimpleTestCase):
-    def setUp(self):
-        self.request_factory = RequestFactory()
+
+    request_factory = RequestFactory()
+
+    def assertRenderEqual(self, template_name, context, expected):
+        output = self.engine.render_to_string(template_name, context)
+        self.assertEqual(output, expected)
 
     @setup({"querystring_empty": "{% querystring %}"})
     def test_querystring_empty(self):
-        request = self.request_factory.get("/")
-        template = self.engine.get_template("querystring_empty")
-        context = RequestContext(request)
-        output = template.render(context)
-        self.assertEqual(output, "")
+        context = RequestContext(self.request_factory.get("/"))
+        self.assertRenderEqual("querystring_empty", context, expected="")
 
     @setup({"querystring_non_empty": "{% querystring %}"})
     def test_querystring_non_empty(self):
         request = self.request_factory.get("/", {"a": "b"})
-        template = self.engine.get_template("querystring_non_empty")
         context = RequestContext(request)
-        output = template.render(context)
-        self.assertEqual(output, "?a=b")
+        self.assertRenderEqual("querystring_non_empty", context, expected="?a=b")
 
     @setup({"querystring_multiple": "{% querystring %}"})
     def test_querystring_multiple(self):
         request = self.request_factory.get("/", {"x": "y", "a": "b"})
-        template = self.engine.get_template("querystring_multiple")
         context = RequestContext(request)
-        output = template.render(context)
-        self.assertEqual(output, "?x=y&a=b")
+        self.assertRenderEqual("querystring_multiple", context, expected="?x=y&a=b")
 
     @setup({"querystring_replace": "{% querystring a=1 %}"})
     def test_querystring_replace(self):
         request = self.request_factory.get("/", {"x": "y", "a": "b"})
-        template = self.engine.get_template("querystring_replace")
         context = RequestContext(request)
-        output = template.render(context)
-        self.assertEqual(output, "?x=y&a=1")
+        self.assertRenderEqual("querystring_replace", context, expected="?x=y&a=1")
 
     @setup({"querystring_add": "{% querystring test_new='something' %}"})
     def test_querystring_add(self):
         request = self.request_factory.get("/", {"a": "b"})
-        template = self.engine.get_template("querystring_add")
         context = RequestContext(request)
-        output = template.render(context)
-        self.assertEqual(output, "?a=b&test_new=something")
+        self.assertRenderEqual(
+            "querystring_add", context, expected="?a=b&test_new=something"
+        )
 
     @setup({"querystring_remove": "{% querystring test=None a=1 %}"})
     def test_querystring_remove(self):
         request = self.request_factory.get("/", {"test": "value", "a": "1"})
-        template = self.engine.get_template("querystring_remove")
         context = RequestContext(request)
-        output = template.render(context)
-        self.assertEqual(output, "?a=1")
+        self.assertRenderEqual("querystring_remove", context, expected="?a=1")
 
     @setup({"querystring_remove_nonexistent": "{% querystring nonexistent=None a=1 %}"})
     def test_querystring_remove_nonexistent(self):
         request = self.request_factory.get("/", {"x": "y", "a": "1"})
-        template = self.engine.get_template("querystring_remove_nonexistent")
         context = RequestContext(request)
-        output = template.render(context)
-        self.assertEqual(output, "?x=y&a=1")
+        self.assertRenderEqual(
+            "querystring_remove_nonexistent", context, expected="?x=y&a=1"
+        )
 
     @setup({"querystring_list": "{% querystring a=my_list %}"})
     def test_querystring_add_list(self):
         request = self.request_factory.get("/")
-        template = self.engine.get_template("querystring_list")
         context = RequestContext(request, {"my_list": [2, 3]})
-        output = template.render(context)
-        self.assertEqual(output, "?a=2&a=3")
+        self.assertRenderEqual("querystring_list", context, expected="?a=2&a=3")
 
     @setup({"querystring_query_dict": "{% querystring request.GET a=2 %}"})
     def test_querystring_with_explicit_query_dict(self):
         request = self.request_factory.get("/", {"a": 1})
-        output = self.engine.render_to_string(
-            "querystring_query_dict", {"request": request}
+        self.assertRenderEqual(
+            "querystring_query_dict", {"request": request}, expected="?a=2"
         )
-        self.assertEqual(output, "?a=2")
 
     @setup({"querystring_query_dict_no_request": "{% querystring my_query_dict a=2 %}"})
     def test_querystring_with_explicit_query_dict_and_no_request(self):
         context = {"my_query_dict": QueryDict("a=1&b=2")}
-        output = self.engine.render_to_string(
-            "querystring_query_dict_no_request", context
+        self.assertRenderEqual(
+            "querystring_query_dict_no_request", context, expected="?a=2&b=2"
         )
-        self.assertEqual(output, "?a=2&b=2")
 
     @setup({"querystring_no_request_no_query_dict": "{% querystring %}"})
     def test_querystring_without_request_or_explicit_query_dict(self):