tests/test-basic.out

tests: fix bashism to load helpers.sh

`source` isn't available at POSIX sh.

changeset:   0:0acdaf898367
tag:         tip
user:        test
date:        Mon Jan 12 13:46:40 1970 +0000
summary:     test

b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 644   a
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