From a7b2d8d12bb536abf769b0e6b7b698ffc52008bb Mon Sep 17 00:00:00 2001
From: Artem Muterko <artieua@gmail.com>
Date: Tue, 17 Jan 2017 15:14:48 +0200
Subject: [PATCH] Add tests for qs_exists

---
 tests/test_validators.py | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/tests/test_validators.py b/tests/test_validators.py
index 37e662b8e..0234111eb 100644
--- a/tests/test_validators.py
+++ b/tests/test_validators.py
@@ -1,10 +1,10 @@
 import datetime
 
-from django.db import models
+from django.db import DataError, models
 from django.test import TestCase
 
 from rest_framework import serializers
-from rest_framework.validators import UniqueValidator
+from rest_framework.validators import UniqueValidator, qs_exists
 
 
 def dedent(blocktext):
@@ -429,3 +429,24 @@ class TestHiddenFieldUniquenessForDateValidation(TestCase):
                     validators = [<UniqueForDateValidator(queryset=HiddenFieldUniqueForDateModel.objects.all(), field='slug', date_field='published')>]
         """)
         assert repr(serializer) == expected
+
+
+class ValidatorsTests(TestCase):
+
+    def test_qs_exists_handles_type_error(self):
+        class TypeErrorQueryset(object):
+            def exists(self):
+                raise TypeError
+        assert qs_exists(TypeErrorQueryset()) is False
+
+    def test_qs_exists_handles_value_error(self):
+        class ValueErrorQueryset(object):
+            def exists(self):
+                raise ValueError
+        assert qs_exists(ValueErrorQueryset()) is False
+
+    def test_qs_exists_handles_data_error(self):
+        class DataErrorQueryset(object):
+            def exists(self):
+                raise DataError
+        assert qs_exists(DataErrorQueryset()) is False