tests_printf_float: fixed precision in test case

[A-Paul]

While testing for Release 2016.04 it turned out that the test always failed. A precision value according to the reference string was missing.

[kYc0o]

Looks valid but I don't see why adding only one decimal... (or two or three...) This is only for the test?

[kaspar030]

I don't see why adding only one decimal...

Same here, why not check for the full value?

[aabadie]

Same here, why not check for the full value?

The test was designed like this at the beginning, I'm surprised that with the wrong format string. Checking the full value, or 1 or 2 digits is a mater of taste.
Maybe the test can be improved by testing with all possible digits formatting (1, 2, 3 with valid results and maybe unexpected values like 4) but IMHO that will be a bit overkill.

[haukepetersen]

already proposed a more complete version of the test: #5384

[A-Paul]

@aabadie the ocurrence of a duplicate PR indicates that there is need to fix this bug.
Can you agree to merge this quick and then wait for improvements like #5384?

[miri64]

@aabadie also see #5512 (comment)

[aabadie]

@A-Paul, @miri64. I think we should merge this one as it's a simple fix for the initial problem. #5384 is a more complete refactoring of the initial test.

ACK