[Issue 18235] New: Group logically similar tests into the same module in the D2 testsuite

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18235

          Issue ID: 18235
           Summary: Group logically similar tests into the same module in
                    the D2 testsuite
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

Each new file added to the testsuite may as well be adding 5 seconds onto the
overall runtime.  Logical groupings could be done to improve the overall CI
speed.

For example, all fail_compilation tests that check coverage of error messages
in `dmd/dinterpret.d` could be put into a single module
`fail_compilation/fail_dinterpret.d`

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