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The pr-review-poster was flagging `gtest/gtest.h file not found` on any PR that added or modified a test file, because clang-tidy-diff-18.py ran against files that weren't in the compilation database. PR #27004 and PR #26233 both hit this. The root cause is that test TUs only enter compile_commands.json when BUILD_TESTING is ON, which the historical clang-tidy build does not enable. This PR fixes both halves of the problem: 1. Add a second make target `px4_sitl_default-clang-test` that configures a separate build dir with -DCMAKE_TESTING=ON. Test TUs land in its compile_commands.json with resolved gtest/fuzztest include paths. 2. Add an umbrella `clang-ci` target that depends on both `px4_sitl_default-clang` and `px4_sitl_default-clang-test` so the PR job prepares both build dirs with one make invocation. 3. On PR events the workflow uses `make clang-ci`, installs libclang-rt-18-dev (needed so fuzztest's FUZZTEST_FUZZING_MODE flags do not fail the abseil try_compile with a misleading "pthreads not found" error), and routes the clang-tidy-diff producer at the test-enabled build dir. 4. Push-to-main is left entirely alone: same single build dir, same `make px4_sitl_default-clang`, same `make clang-tidy`. Test files are not in that DB so run-clang-tidy.py keeps ignoring them exactly as before. This preserves green main while ~189 pre-existing clang-tidy issues in test files remain untouched; fixing those is out of scope for this change. 5. Replace the fragile `:!*/test/*` pathspec filter (which missed flat `*Test.cpp` files in module roots) with `Tools/ci/clang-tidy-diff-filter.py`, which reads the compilation database and drops any changed source file that is not a TU. Headers always pass through. Production code that happens to use test-like names (src/systemcmds/actuator_test, src/drivers/test_ppm, etc.) stays analyzed because those are real px4_add_module targets. Verified in the ghcr.io/px4/px4-dev:v1.17.0-rc2 container and on the real CI runner: - cmake configure with CMAKE_TESTING=ON succeeds after installing libclang-rt-18-dev (Found Threads: TRUE) - compile_commands.json grows from 1333 to 1521 TUs - Modifying HysteresisTest.cpp with a new `const char *p = NULL` correctly flags hicpp-use-nullptr and clang-diagnostic-unused-variable on the new line, while pre-existing issues on other lines of the same file stay suppressed by clang-tidy-diff-18.py's line filter ("Suppressed ... 1 due to line filter") - No gtest/gtest.h false positives - Push-to-main path unchanged, still green Signed-off-by: Ramon Roche <mrpollo@gmail.com>