diff --git a/tests/test_types.py b/tests/test_types.py
new file mode 100644
index 0000000..ed2999c
--- /dev/null
+++ b/tests/test_types.py
@@ -0,0 +1,108 @@
+import json
+import unittest
+
+import appose
+
+class TypesTest(unittest.TestCase):
+    JSON = (
+        '{"posByte":123,"negByte":-98,'
+        '"posDouble":9.876543210123456,"negDouble":-1.234567890987654e+302,'
+        '"posFloat":9.876543,"negFloat":-1.2345678,'
+        '"posInt":1234567890,"negInt":-987654321,'
+        '"posLong":12345678987654321,"negLong":-98765432123456789,'
+        '"posShort":32109,"negShort":-23456,'
+        '"trueBoolean":true,"falseBoolean":false,'
+        '"aChar":"\\u0000",'
+        '"aString":"-=[]\\\\;\',./_+{}|:\\"<>?'
+        'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz'
+        '~!@#$%^&*()",'
+        '"numbers":[1,1,2,3,5,8],'
+        '"words":["quick","brown","fox"],'
+        '"ndArray":{'
+        '"appose_type":"ndarray",'
+        '"shm":{'
+        '"appose_type":"shm",'
+        '"name":"SHM_NAME",'
+        '"size":4000'
+        '},'
+        '"dtype":"float32",'
+        '"shape":[2,20,25]'
+        '}}'
+    )
+
+    STRING = (
+        '-=[]\\;\',./_+{}|:"<>?'
+        'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz'
+        '~!@#$%^&*()'
+    )
+
+    NUMBERS = [1, 1, 2, 3, 5, 8]
+
+    WORDS = ["quick", "brown", "fox"]
+
+    def test_encode(self):
+        data = {
+            'posByte': 123,
+            'negByte': -98,
+            'posDouble': 9.876543210123456,
+            'negDouble': -1.234567890987654e+302,
+            'posFloat': 9.876543,
+            'negFloat': -1.2345678,
+            'posInt': 1234567890,
+            'negInt': -987654321,
+            'posLong': 12345678987654321,
+            'negLong': -98765432123456789,
+            'posShort': 32109,
+            'negShort': -23456,
+            'trueBoolean': True,
+            'falseBoolean': False,
+            'nullChar': '\0',
+            'aString': self.STRING,
+            'numbers': self.NUMBERS,
+            'words': self.WORDS,
+        }
+
+        dtype = "float"
+        shape = [2, 20, 25]
+        with appose.types.NDArray(dtype, shape) as ndArray:
+            data['ndArray'] = ndArray
+            json_str = appose.types.encode(data)
+            self.assertIsNotNone(json_str)
+            self.assertEqual(self.JSON, self.generalize_shm_name(json_str))
+
+    def test_decode(self):
+        data = appose.types.decode(self.JSON)
+        self.assertIsNotNone(data)
+        self.assertEqual(19, len(data))
+        self.assertEqual(123, data['posByte'])  # NB: decodes back to int
+        self.assertEqual(-98, data['negByte'])  # NB: decodes back to int
+        self.assertEqual(9.876543210123456, data['posDouble'])
+        self.assertEqual(-1.234567890987654e+302, data['negDouble'])
+        self.assertEqual(9.876543, self.bd(data['posFloat']))
+        self.assertEqual(-1.2345678, self.bd(data['negFloat']))
+        self.assertEqual(1234567890, data['posInt'])
+        self.assertEqual(-987654321, data['negInt'])
+        self.assertEqual(12345678987654321, data['posLong'])
+        self.assertEqual(-98765432123456789, data['negLong'])
+        self.assertEqual(32109, data['posShort'])  # NB: decodes back to int
+        self.assertEqual(-23456, data['negShort'])  # NB: decodes back to int
+        self.assertTrue(data['trueBoolean'])
+        self.assertFalse(data['falseBoolean'])
+        self.assertEqual('\0', data['nullChar'])
+        self.assertEqual(self.STRING, data['aString'])
+        self.assertEqual(self.NUMBERS, data['numbers'])
+        self.assertEqual(self.WORDS, data['words'])
+
+        ndArray = data['ndArray']
+        with ndArray:
+            self.assertEqual("float32", ndArray.dtype)
+            self.assertEqual([2, 20, 25], ndArray.shape)
+
+    def generalize_shm_name(self, json_str):
+        if json_str is None:
+            return None
+        return re.sub(
+            r'("shm":\{"appose_type":"shm","name":").*?"',
+            r'\1SHM_NAME"',
+            json_str
+        )