(Submitted after cr #6820550 fix -- this is point "1)" from the #6820550 description).
The parameters of the TestDescripion are now stored as a sorted double list.
To perform #getParameter(String) operation a binary search is performed, what requires O(Lg(n)) operations.
However, using of hashcode-based implementation would be faster since it requires O(1) operations.
Suggested to use Collections#unmodifiableMap(new HashMap(....)) as a parameters storage, and use the default implementation of #get() to get peremeters.
#getParameterKeys() also may be implemented as .keySet().iterator().