Peter M. Groen / oletools

Will add excel test code and samples later, no need to have separate
folders for different file types.

This is in preparation of adding new function process_xlsx

…re process_file is called

This is based on the OpenXML specification (ISO 29500-1:2016 / ECMA-376)

Msodde more tests

Minor msodde fixes

- fix some whitespace and docs
- replace bare-except
- omit empty dde links in output

With this change we replace the relative import.

Also use with-statement to open test file, so file is always closed after
reading (python3 unittest issued a warning).

This is the case e.g. if piping the output of msodde.py to file or other
program (e.g. grep) on a linux shell. In that case sys.stdout (i.e. print)
can only handle ascii, which is a problem when printing unicode dde links.

Want to use the OutputCapture in another unit test. There will probably be
more such test helpers over time that need to be imported from different
unit tests.

The old version assumed that main() is only called once per import. When
called multiple times from other scripts, the json output lacked a leading
'['.

This simplifies unit test creation a lot

Log output is not json-compatible, so warn if -ldebug -j is given to msodde.
(Could create a logger formatter that always creates json-compatible output
 but that is probably overkill right now)

Replace old commented debug-prints with log.debug() or remove them.

Doc in msodde (and json output)

These tests capture stdout to check whether msodde finds dde links correctly

This should help avoiding some common mistakes when adding new unit tests