should load_all() source test helpers?

[jennybc]

Moving over here as directed. Related to r-lib/testthat#415.

From off-github discussion:

I think load_all() would basically call source_test_helpers() on your
behalf and put them in an environment that's attached to the search
path. I think with that + test_path() you'd be able to load_all() and
then run individual lines of tests with no difficulty

[lock]

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