llvm/llvm/test/tools/llvm-reduce/fail-file-open.test

# RUN: not llvm-reduce --abort-on-invalid-reduction --test=echo %s.NotAFileInTestingDir 2>&1 | FileCheck %s

This file will not be read. An invalid file path is fed to llvm-reduce.

# CHECK: llvm-reduce{{.*}}: error: {{.*}}.NotAFileInTestingDir: