diff --git a/02_hash_maps/hm.py b/02_hash_maps/hm.py
index 54a489c..71c80f2 100644
--- a/02_hash_maps/hm.py
+++ b/02_hash_maps/hm.py
@@ -11,3 +11,9 @@ class HashMap():
 	def size(self):
 		return self._size
 	
+	def _hash(self, value):
+		if len(value) < 1:
+			raise Exception("Size of value must be greater than one")
+		return 1
+
+	
diff --git a/02_hash_maps/hm_test.py b/02_hash_maps/hm_test.py
index 86e2499..1561125 100644
--- a/02_hash_maps/hm_test.py
+++ b/02_hash_maps/hm_test.py
@@ -12,9 +12,16 @@ import unittest
 class test_hash_map(unittest.TestCase):
 
 	def test_size(self):
-	
 		hm = HashMap()
 		self.assertEqual(hm.size(), 0)
 
+	def test__hash(self):
+		hm = HashMap()
+		value = "test"
+		self.assertEqual(hm._hash("test"), 1)
+
+		value = ""
+		self.assertRaises(Exception, lambda x : hm._hash(value))
+
 if __name__ == "__main__":
 	unittest.main()