runtime: make TestMemStats failure messages useful

Currently most TestMemStats failures dump the whole MemStats object if
anything is amiss without telling you what is amiss, or even which
field is wrong. This makes it hard to figure out what the actual
problem is.

Replace this with a reflection walk over MemStats and a map of
predicates to check. If one fails, we can construct a detailed and
descriptive error message. The predicates are a direct translation of
the current tests.

Change-Id: I5a7cafb8e6a1eeab653d2e18bb74e2245eaa5444
Reviewed-on: https://go-review.googlesource.com/37512
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
1 file changed
tree: e9432205f9678c9a5819195ca606bf096d241ce4
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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