public CompactNumberFormat​(String decimalPattern,
                           DecimalFormatSymbols symbols,
                           String[] compactPatterns)
As per spec :
IllegalArgumentException - if the given decimalPattern or the compactPatterns array contains an invalid pattern or if a null appears in the array of compact patterns

When I provide the ‘null’ in the compactPatterns array :
I expect : IAE,
Actual : NullpointerException.