[PATCH v2] imagehlp/tests: Add initial tests for CheckSumMappedFile

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=50026

Your paranoid android.


=== build (build log) ===

error: patch failed: dlls/imagehlp/modify.c:89
error: patch failed: dlls/imagehlp/tests/integrity.c:26
Task: Patch failed to apply

Task errors:
The previous 1 run(s) terminated abnormally

=== debian9 (build log) ===

error: patch failed: dlls/imagehlp/modify.c:89
error: patch failed: dlls/imagehlp/tests/integrity.c:26
Task: Patch failed to apply

=== debian9 (build log) ===

error: patch failed: dlls/imagehlp/modify.c:89
error: patch failed: dlls/imagehlp/tests/integrity.c:26
Task: Patch failed to apply