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test: improve code coverage for string decoder #22306

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10 changes: 10 additions & 0 deletions test/parallel/test-string-decoder.js
Original file line number Diff line number Diff line change
Expand Up @@ -161,6 +161,16 @@ common.expectsError(
}
);

common.expectsError(
() => new StringDecoder('utf8').write(null),
{
code: 'ERR_INVALID_ARG_TYPE',
type: TypeError,
message: 'The "buf" argument must be one of type Buffer, Uint8Array, or' +
' ArrayBufferView. Received type object'
}
);

// test verifies that StringDecoder will correctly decode the given input
// buffer with the given encoding to the expected output. It will attempt all
// possible ways to write() the input buffer, see writeSequences(). The
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