[m-rev.] for review: test_helper_N

[Zoltan Somogyi]

Months ago we agreed on the concept that all test modules
that are not the main modules of their test cases should have
"helper" in their names, with a numeral suffix. This does that
for the hard_coded directory.

This is for review of the general appoach; the details are mostly very boring.

Zoltan.
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