llvm/clang-tools-extra/pseudo/test/Unit/lit.cfg.py

import lit.formats

config.name = "clangPseudo Unit Tests"
config.test_format = lit.formats.GoogleTest(".", "Tests")
config.test_source_root = config.clang_pseudo_binary_dir + "/unittests"
config.test_exec_root = config.clang_pseudo_binary_dir + "/unittests"

# Point the dynamic loader at dynamic libraries in 'lib'.
# FIXME: it seems every project has a copy of this logic. Move it somewhere.
import platform

if platform.system() == "Darwin":
    shlibpath_var = "DYLD_LIBRARY_PATH"
elif platform.system() == "Windows":
    shlibpath_var = "PATH"
else:
    shlibpath_var = "LD_LIBRARY_PATH"
config.environment[shlibpath_var] = os.path.pathsep.join(
    ("@SHLIBDIR@", "@LLVM_LIBS_DIR@", config.environment.get(shlibpath_var, ""))
)

# It is not realistically possible to account for all options that could
# possibly be present in system and user configuration files, so disable
# default configs for the test runs.
config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"