Austin Zheng 51f19eafdf [stdlib] Adding new indices model tests (#2991) ...

* [stdlib] Adding new tests for collection indices

Changes:
- Added tests for 'index(next:)'
- Added tests for all 'formIndex' API variants
- Modified existing tests to better test bidirectional collections

* Fixes reflecting review feedback

2016-06-16 10:53:47 -07:00

3.2 KiB

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