diff --git a/fizzbuzz.py b/fizzbuzz.py
new file mode 100644
index 0000000..a2da0e8
--- /dev/null
+++ b/fizzbuzz.py
@@ -0,0 +1,15 @@
+"""
+fizzbuzz
+"""
+
+
+def FizzBuzz(n):
+    if isinstance(n, int):
+        if n % 15 == 0:
+            return "FizzBuzz"
+        elif n % 3 == 0:
+            return "Fizz"
+        elif n % 5 == 0:
+            return "Buzz"
+        else:
+            return n
diff --git a/test_fizzbuzz.py b/test_fizzbuzz.py
new file mode 100644
index 0000000..857f505
--- /dev/null
+++ b/test_fizzbuzz.py
@@ -0,0 +1,25 @@
+"""
+test fizzbuzz
+
+"""
+
+import unittest
+import fizzbuzz
+
+
+class TestFizzBuzz(unittest.TestCase):
+    def test_num_3_and_5(self):
+        self.assertEqual(fizzbuzz.FizzBuzz(15), 'FizzBuzz')
+
+    def test_num_3(self):
+        self.assertEqual(fizzbuzz.FizzBuzz(3), 'Fizz')
+
+    def test_num_5(self):
+        self.assertEqual(fizzbuzz.FizzBuzz(5), 'Buzz')
+
+    def test_num_other(self):
+        self.assertEqual(fizzbuzz.FizzBuzz(2), 2)
+
+
+if __name__ == '__main__':
+    unittest.main()