Generate stable test output

[florentx]

Currently the output of the tests is not stable when running in different environments:

• some absolute file paths are printed, which depend on the path of the build directory
• Last updated timestamp is printed in the output of many tests

This PR removes the above glitches. It is a prerequisite for fixing issue #30

Details of the changes:

• florentx/asciidoc@1c49ffe patches the time.localtime function and the TZ environment variable which are used to generate the Last updated timestamp
• florentx/asciidoc@b3fb9cc adds a stub barchart.py file to avoid printing an error message with the absolute path of the missing file
• florentx/asciidoc@f4c5f46 replaces absolute path {docfile} with relative path {docname}.txt

[florentx]

Additional fixes to avoid depending on version numbers for the expected output:

• florentx/asciidoc@ebc4078 changes output:

-<div class="content"><!-- Generator: GNU source-highlight 3.1.7
+<div class="content"><!-- Generator: GNU source-highlight

• florentx/asciidoc@2e0bc77 changes output:

-<meta name="generator" content="AsciiDoc 8.6.9">
+<meta name="generator" content="AsciiDoc test-0.1.1">

[florentx]

could be named _frozen_localtime instead of _fake_localtime to be consistent.

[michel-kraemer]

+1

What about your comments? Are you still working on this PR or should we merge it?

Cheers,
Michel

[florentx]

I think I will apply the 2 suggestions I've proposed in comments : re-reading them after some days, I am +1 with myself 😄

Then this PR is ready for merging, and I could work to finish #30.

[aerostitch]

Hi,

For the Last updated field, you could also use the footer-style attribute to none as default in the tests. This would remove the last updated field in the html pages for the tests.
This attribute is introduced by #9 .

Joseph

[elextr]

why does adding the generated version help to produce stable output?

[florentx]

actually the switch --gen-version toggle off the version number

[elextr]

Ok, makes sense (well your change does, the option doesn't, should be --no-gen-version).

[elextr]

Are you able to squash the commits correcting previous commits? Leaving 4 commits.

[florentx]

ok, I'll try to rewrite the history

[florentx]

I've rebased and merged the commits.
Build passes.