llvm-project/llvm/test/tools/llvm-readobj/ELF/output-style.test

## Error for an unknown output style.
RUN: not llvm-readobj --elf-output-style=unknown 2>&1 | FileCheck %s

CHECK: error: --elf-output-style value should be either 'LLVM', 'GNU', or 'JSON', but was 'unknown'