This is a testharness.js-based test.
[FAIL] chunk of type undefined should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type null should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type numeric should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type object, not BufferSource should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type array should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type SharedArrayBuffer should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type shared Uint8Array should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type invalid deflate bytes should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
[FAIL] chunk of type invalid gzip bytes should error the stream for brotli
  promise_test: Unhandled rejection with value: object "TypeError: Failed to construct 'DecompressionStream': Unsupported compression format: 'brotli'"
Harness: the test ran to completion.