Update test_tender_data_limited

In order to add required fields in API v. 2.1 to negotiation and
negotiation.quick procurements

@@ -189,10 +189,30 @@ def test_tender_data_limited(intervals, procurement_method_type):
             "currency": "UAH",
             "valueAddedTaxIncluded": True
         },
+        "description": fake.sentence(nb_words=10, variable_nb_words=True),
         "title": u"Послуги шкільних їдалень",
     }
-    if procurement_method_type == "negotiation" or procurement_method_type == "negotiation.quick":
-        data.update({"procurementMethodDetails": "quick, accelerator=1440"})
+    if procurement_method_type == "negotiation":
+        cause_variants = (
+            "artContestIP",
+            "noCompetition",
+            "twiceUnsuccessful",
+            "additionalPurchase",
+            "additionalConstruction",
+            "stateLegalServices"
+        )
+        cause = fake.random_element(cause_variants)
+        data.update({"cause": cause})
+    if procurement_method_type == "negotiation.quick":
+        cause_variants = ('quick',)
+        cause = fake.random_element(cause_variants)
+        data.update({"cause": cause})
+    if procurement_method_type == "negotiation" \
+    or procurement_method_type == "negotiation.quick":
+        data.update({
+            "procurementMethodDetails": "quick, accelerator=1440",
+            "causeDescription": fake.sentence(nb_words=10, variable_nb_words=True)
+        })
     return data