[Foundation] Correct NSRange equality typo and add unit tests for newly added NSRange behaviors #10316
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Cherry pick of pr #10282
This fixes rdar://problem/32649690 as well as a few other minor cleanup issues discovered when testing. And most importantly adds unit tests for the new functionality of NSRange
Explanation:
NSRange equality had a typo that incorrectly compared the length. Furthermore there were a few cases where the debugDescription should be improved as well as the string initializer had some edge cases. This commit addresses those failures.
Scope:
This is just runtime behavior of NSRange
Radar (and possibly SR Issue):
rdar://problem/32649690
Risk:
These are newly introduced behaviors that have no current adoption other than the initial seeds.
Testing:
A number of new tests were added to validate the behavior of the new NSRange functionality