Function test

test/parallel/test-string-decoder.js:225–250

(encoding, input, expected, singleSequence)

// singleSequence allows for easy debugging of a specific sequence which is
// useful in case of test failures.
function test(encoding, input, expected, singleSequence) {
  let sequences;
  if (!singleSequence) {
    sequences = writeSequences(input.length);
  } else {
    sequences = [singleSequence];
  }
  const hexNumberRE = /.{2}/g;
  sequences.forEach((sequence) => {
    const decoder = new StringDecoder(encoding);
    let output = '';
    sequence.forEach((write) => {
      output += decoder.write(input.slice(write[0], write[1]));
    });
    output += decoder.end();
    if (output !== expected) {
      const message =
        `Expected "${unicodeEscape(expected)}", ` +
        `but got "${unicodeEscape(output)}"\n` +
        `input: ${input.toString('hex').match(hexNumberRE)}\n` +
        `Write sequence: ${JSON.stringify(sequence)}\n` +
        `Full Decoder State: ${inspect(decoder)}`;
      assert.fail(message);
    }
  });
}

// unicodeEscape prints the str contents as unicode escape codes.
function unicodeEscape(str) {