[Bug 42179] New: Better detect which tests need to be rerun

https://bugs.winehq.org/show_bug.cgi?id=42179

Bug ID: 42179
           Summary: Better detect which tests need to be rerun
           Product: Wine-Testbot
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

The TestBot sometimes does not always know which tests need to be rerun and
thus tries to run the test executable with no argument. This typically happens
in the following circumstances:
* When a non-C file is patched, such as a resource or JavaScript file.
* When a test file is removed. This case is actually similar to the previous
case where the non-C file is the Makefile.in file.

Note however that if there is only one test file this works anyway because in
that case the test executable just runs that one test by default.
I added some test cases for this in the TestBot test suite:
https://github.com/fgouget/wine/tree/wtbsuite