[Issue 18715] New: Non-documented unittests should not use unpredictableSeed or default Random alias

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18715

          Issue ID: 18715
           Summary: Non-documented unittests should not use
                    unpredictableSeed or default Random alias
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

Rationale:

https://github.com/dlang/phobos/pull/6410#discussion_r178660995
>Use a fixed seed and a fixed engine, everything else might lead to random coverage changes.

Exceptions are made for public unittests that may be meant to demonstrate use
of unpredictableSeed and/or the default Random.

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