[RED] Add test for csv export with filters

apps/exportables/tests/test_units/test_exportables.py

@@ -181,8 +181,8 @@ class ExportableViewTest(APITestCase):
 
         self.assertJSONEqual(response.content, data)
 
-    def test_export_investigation_data_to_csv_all(self):
-        url = "/exportables/investigation-cases-csv/"
+    def export_csv_test_util(self, filter):
+        url = "/exportables/investigation-cases-csv/" + filter
         response = self.client.get(url)
 
         self.assertEqual(response.status_code, status.HTTP_200_OK)
@@ -197,4 +197,20 @@ class ExportableViewTest(APITestCase):
         headers = body.pop(0)
 
         self.assertEqual(headers, INVESTIGATION_CASE_RENDERER_FIELDS)
+        return body
+
+    def test_export_investigation_data_to_csv_all(self):
+        body = self.export_csv_test_util("")
         self.assertEqual(len(body), 5)
+
+    def test_export_investigation_data_to_csv_filter_gender(self):
+        body = self.export_csv_test_util("?is_male=false")
+        self.assertEqual(len(body), 2)
+
+    def test_export_investigation_data_to_csv_filter_age(self):
+        body = self.export_csv_test_util("?age=21")
+        self.assertEqual(len(body), 2)
+
+    def test_export_investigation_data_to_csv_filter_district(self):
+        body = self.export_csv_test_util("?district=Beji")
+        self.assertEqual(len(body), 1)