initial
diff --git a/simplejson/tests/test_decimal.py b/simplejson/tests/test_decimal.py
new file mode 100644
index 0000000..a694c7e
--- /dev/null
+++ b/simplejson/tests/test_decimal.py
@@ -0,0 +1,33 @@
+from decimal import Decimal
+from unittest import TestCase
+
+import simplejson as json
+
+class TestDecimal(TestCase):
+    NUMS = "1.0", "10.00", "1.1", "1234567890.1234567890", "500"
+    def test_decimal_encode(self):
+        for d in map(Decimal, self.NUMS):
+            self.assertEquals(json.dumps(d, use_decimal=True), str(d))
+    
+    def test_decimal_decode(self):
+        for s in self.NUMS:
+            self.assertEquals(json.loads(s, parse_float=Decimal), Decimal(s))
+    
+    def test_decimal_roundtrip(self):
+        for d in map(Decimal, self.NUMS):
+            # The type might not be the same (int and Decimal) but they
+            # should still compare equal.
+            self.assertEquals(
+                json.loads(
+                    json.dumps(d, use_decimal=True), parse_float=Decimal),
+                d)
+            self.assertEquals(
+                json.loads(
+                    json.dumps([d], use_decimal=True), parse_float=Decimal),
+                [d])
+
+    def test_decimal_defaults(self):
+        d = Decimal(1)
+        # use_decimal=False is the default
+        self.assertRaises(TypeError, json.dumps, d, use_decimal=False)
+        self.assertRaises(TypeError, json.dumps, d)
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