1 files changed, 95 insertions, 0 deletions
diff --git a/tests/test_files.py b/tests/test_files.py
new file mode 100644
index 00000000..78f4cf42
--- /dev/null
+++ b/tests/test_files.py
@@ -0,0 +1,95 @@
+from __future__ import unicode_literals
+from django.test import TestCase
+from rest_framework import serializers
+from rest_framework.compat import BytesIO
+from rest_framework.compat import six
+import datetime
+
+
+class UploadedFile(object):
+    def __init__(self, file=None, created=None):
+        self.file = file
+        self.created = created or datetime.datetime.now()
+
+
+class UploadedFileSerializer(serializers.Serializer):
+    file = serializers.FileField(required=False)
+    created = serializers.DateTimeField()
+
+    def restore_object(self, attrs, instance=None):
+        if instance:
+            instance.file = attrs['file']
+            instance.created = attrs['created']
+            return instance
+        return UploadedFile(**attrs)
+
+
+class FileSerializerTests(TestCase):
+    def test_create(self):
+        now = datetime.datetime.now()
+        file = BytesIO(six.b('stuff'))
+        file.name = 'stuff.txt'
+        file.size = len(file.getvalue())
+        serializer = UploadedFileSerializer(data={'created': now}, files={'file': file})
+        uploaded_file = UploadedFile(file=file, created=now)
+        self.assertTrue(serializer.is_valid())
+        self.assertEqual(serializer.object.created, uploaded_file.created)
+        self.assertEqual(serializer.object.file, uploaded_file.file)
+        self.assertFalse(serializer.object is uploaded_file)
+
+    def test_creation_failure(self):
+        """
+        Passing files=None should result in an ValidationError
+
+        Regression test for:
+        https://github.com/tomchristie/django-rest-framework/issues/542
+        """
+        now = datetime.datetime.now()
+
+        serializer = UploadedFileSerializer(data={'created': now})
+        self.assertTrue(serializer.is_valid())
+        self.assertEqual(serializer.object.created, now)
+        self.assertIsNone(serializer.object.file)
+
+    def test_remove_with_empty_string(self):
+        """
+        Passing empty string as data should cause file to be removed
+
+        Test for:
+        https://github.com/tomchristie/django-rest-framework/issues/937
+        """
+        now = datetime.datetime.now()
+        file = BytesIO(six.b('stuff'))
+        file.name = 'stuff.txt'
+        file.size = len(file.getvalue())
+
+        uploaded_file = UploadedFile(file=file, created=now)
+
+        serializer = UploadedFileSerializer(instance=uploaded_file, data={'created': now, 'file': ''})
+        self.assertTrue(serializer.is_valid())
+        self.assertEqual(serializer.object.created, uploaded_file.created)
+        self.assertIsNone(serializer.object.file)
+
+    def test_validation_error_with_non_file(self):
+        """
+        Passing non-files should raise a validation error.
+        """
+        now = datetime.datetime.now()
+        errmsg = 'No file was submitted. Check the encoding type on the form.'
+
+        serializer = UploadedFileSerializer(data={'created': now, 'file': 'abc'})
+        self.assertFalse(serializer.is_valid())
+        self.assertEqual(serializer.errors, {'file': [errmsg]})
+
+    def test_validation_with_no_data(self):
+        """
+        Validation should still function when no data dictionary is provided.
+        """
+        now = datetime.datetime.now()
+        file = BytesIO(six.b('stuff'))
+        file.name = 'stuff.txt'
+        file.size = len(file.getvalue())
+        uploaded_file = UploadedFile(file=file, created=now)
+
+        serializer = UploadedFileSerializer(files={'file': file})
+        self.assertFalse(serializer.is_valid())