1 files changed, 49 insertions, 0 deletions
diff --git a/rest_framework/tests/fields.py b/rest_framework/tests/fields.py
new file mode 100644
index 00000000..8068272d
--- /dev/null
+++ b/rest_framework/tests/fields.py
@@ -0,0 +1,49 @@
+"""
+General serializer field tests.
+"""
+
+from django.db import models
+from django.test import TestCase
+from rest_framework import serializers
+
+
+class TimestampedModel(models.Model):
+    added = models.DateTimeField(auto_now_add=True)
+    updated = models.DateTimeField(auto_now=True)
+
+
+class CharPrimaryKeyModel(models.Model):
+    id = models.CharField(max_length=20, primary_key=True)
+
+
+class TimestampedModelSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = TimestampedModel
+
+
+class CharPrimaryKeyModelSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = CharPrimaryKeyModel
+
+
+class ReadOnlyFieldTests(TestCase):
+    def test_auto_now_fields_read_only(self):
+        """
+        auto_now and auto_now_add fields should be read_only by default.
+        """
+        serializer = TimestampedModelSerializer()
+        self.assertEquals(serializer.fields['added'].read_only, True)
+
+    def test_auto_pk_fields_read_only(self):
+        """
+        AutoField fields should be read_only by default.
+        """
+        serializer = TimestampedModelSerializer()
+        self.assertEquals(serializer.fields['id'].read_only, True)
+
+    def test_non_auto_pk_fields_not_read_only(self):
+        """
+        PK fields other than AutoField fields should not be read_only by default.
+        """
+        serializer = CharPrimaryKeyModelSerializer()
+        self.assertEquals(serializer.fields['id'].read_only, False)