Add fizzbuzz snippet to tests

tests/snippets/fizzbuzz.py

@@ -0,0 +1,14 @@
+def fizzbuzz(n):
+    if n % 3 == 0 and n % 5 == 0:
+        return "FizzBuzz"
+    elif n % 3 == 0:
+        return "Fizz"
+    elif n % 5 == 0:
+        return "Buzz"
+    else:
+        return str(n)
+
+n = 1
+while n < 10:
+    print(fizzbuzz(n))
+    n += 1