new: [tests] Create test foundations

[cvandeplas]

• foundations of tests for ubuntu + mac testing
• find/generate test data that can be published publicly - as git submodule
• allow private test data in testdata-private folder
• parser - basic tests
• unify parser main function and params
• adapt parsing.py and initialise.py to new function call
• adapt analysers to new data format
• analysers - basic tests (for later ... or not)

[cvandeplas]

Meant to also address issues #40 , #41

[aaronkaplan]

I can check out the repo and test on a Mac.

[cvandeplas]

No worries @aaronkaplan , I now also have a mac at my disposal.

[aaronkaplan]

excellent

[cvandeplas]

Last test broke on MacOS:

  File "/Users/runner/work/sysdiagnose/sysdiagnose/analysers/apps.py", line 86, in analyse_path
    for entry in ijson.items(f, 'data.item'):
ijson.common.IncompleteJSONError: parse error: trailing garbage
          parentActivityIdentifier":0} {"timezoneName":"","eventType":
                     (right here) ------^

[cvandeplas]

Linux test will break until PR mandiant/macos-UnifiedLogs#18 is merged.

[cvandeplas]

wooohoo, tests are now fine as unifiedlog_parser_json patch has been accepted !