Update decimal_isolate.py

Author: JakeGerber

maths/decimal_isolate.py

@@ -19,6 +19,8 @@ def decimal_isolate(number, digitAmount):
     0.345
     >>> decimal_isolate(-14.789, 3)
     -0.789
+    >>> decimal_isolate(0, 2)
+    0
     """
     if digitAmount > 0:
         return round(number - int(number), digitAmount)
@@ -31,3 +33,4 @@ def decimal_isolate(number, digitAmount):
     print(decimal_isolate(35.345, 2))
     print(decimal_isolate(35.345, 3))
     print(decimal_isolate(-14.789, 3))
+    print(decimal_isolate(0, 2))