Asset range option

While writing tests, I encountered a problem with the number of vests changing over time. I've created a function that works similarly to python's built-in range() function. It works like this:

tt.Asset.Range(tt.Asset.Test(1), tt.Asset.Test(2))

use analogous to:

range(1, 2)

This allowed me to achieve my goal:

assert tt.Asset.Test(2) in tt.Asset.Range(tt.Asset.Test(1), tt.Asset.Test(3))

I also added the option of specifying the upper deviation percentage:

tt.Asset.Range(tt.Asset.Test(1), percentage_range=10) 

the above case should be understood as follows: from tt.Asset.Test(1) to tt.Asset.Test(1) + 10%

@mzebrak, @kmochocki

package/test_tools/__private/asset.py

@@ -213,7 +213,7 @@ class Asset:
             lower_limit: AssetLimitT,
             upper_limit: Optional[AssetLimitT] = None,
             *,
-            tolerance: Optional[int] = None,
+            tolerance: Union[int, float, None] = None,
         ):
             if not upper_limit and not tolerance:
                 raise TypeError("Range has to be specified with either `upper_limit` or `tolerance`")
@@ -221,9 +221,8 @@ class Asset:
             if upper_limit and tolerance:
                 raise TypeError("Please choose only one option from `upper_limit` or `tolerance`")
 
-            if isinstance(tolerance, (int, float)):
-                if tolerance < 0:
-                    raise TypeError("`tolerance` should be given as an positive number")
+            if tolerance and tolerance < 0:
+                raise TypeError("`tolerance` should be given as an positive number")
 
             self.__lower_limit = lower_limit if upper_limit else lower_limit - (lower_limit * tolerance / 100)
             self.__upper_limit = upper_limit if upper_limit else lower_limit + (lower_limit * tolerance / 100)