diff --git a/fizz.py b/fizz.py
index 8b02047..3668f96 100644
--- a/fizz.py
+++ b/fizz.py
@@ -1,5 +1,4 @@
-for i in range(1, 301):
-
+def processNumber(i):
     buzzes = []
     if i % 3 == 0:
         buzzes.append("Fizz")
@@ -16,6 +15,9 @@
         buzzes.reverse()
 
     if len(buzzes) > 0:
-        print("".join(buzzes))
+        return "".join(buzzes)
     else:
-        print(i)
\ No newline at end of file
+        return i
+
+for i in range(1, 301):
+    print(processNumber(i))
diff --git a/test_fizzbuzz.py b/test_fizzbuzz.py
new file mode 100644
index 0000000..43e6252
--- /dev/null
+++ b/test_fizzbuzz.py
@@ -0,0 +1,43 @@
+## To run the tests in this file:
+##      pip install pytest
+##      pytest
+
+from fizz import processNumber
+
+def test_3_multiple():
+    assert processNumber(3) == "Fizz"
+    assert processNumber(6) == "Fizz"
+
+def test_5_multiple():
+    assert processNumber(5) == "Buzz"
+    assert processNumber(10) == "Buzz"
+    
+def test_3_and_5_multiple():
+    assert processNumber(15) == "FizzBuzz"
+    assert processNumber(30) == "FizzBuzz"
+    
+def test_7_multiple():
+    assert processNumber(7) == "Bang"
+    assert processNumber(21) == "FizzBang"
+    assert processNumber(105) == "FizzBuzzBang"
+    
+def test_11_multiple():
+    assert processNumber(11) == "Bong"
+    assert processNumber(22) == "Bong"
+    assert processNumber(33) == "Bong"
+    assert processNumber(44) == "Bong"
+    assert processNumber(55) == "Bong"
+    
+def test_13_multiple():
+    assert processNumber(65) == "FezzBuzz"
+    assert processNumber(195) == "FizzFezzBuzz"
+    assert processNumber(143) == "FezzBong"
+
+def test_17_multiple():
+    assert processNumber(255) == "BuzzFizz"
+    
+def test_prime_numbers():
+    assert int(processNumber(19)) == 19
+    assert int(processNumber(23))== 23
+    assert int(processNumber(89)) == 89
+    assert int(processNumber(97)) == 97