[cfe-dev] How to verify clang-tidy checks applied to headers?

[Hongbin Zheng via cfe-dev]

Maybe you could first generate the preprocessed file, use the
preprocessed file as the test input and add the "CHECK-MESSAGES" lines
to the preprocessed file?

On Wed, Dec 26, 2018 at 4:39 PM Richard via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
>
> Hi,
>
> I'm trying to write a test for this bug:
> <https://bugs.llvm.org/show_bug.cgi?id=26332>
>
> Namely, that clang-tidy check readability-simplify-boolean-expr
> doesn't apply to the user's header files correctly.
>
> So I wrote a cpp file like this:
>
> ====
> // RUN: %check_clang_tidy %s readability-simplify-boolean-expr %t
>
> #include "readability-simplify-bool-expr.h"
> ====
>
> and I copied readability-simplify-bool-expr.cpp to
> readability-simplify-bool-expr.h to cover all the same cases in a
> header as are covered in a source file.
>
> However, I encounter two problems.  First, I encounter the complaint
> from %check_clang_tidy that my source file contains no CHECK lines.
> If I add a bogus CHECK-MESSAGES comment to my source file, then I can
> continue, but the check still fails to report messages from the
> included header.
>
> I tried changing the run line to invoke clang-tidy directly so I could
> specify -header-filter, but that also failed to work.
>
> I can run clang-tidy manually with -header-filter and get the
> necessary diagnostics, but I need to run this under the test framework
> to verify that the diagnostic described in the bug is missing.
>
> How can I achieve this?
>
> Thanks.
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