function getExpectedOutput() {
  var output = fs
    .readFileSync(path.join(__dirname, 'fixtures', 'diffs', 'output'), 'UTF8')
    .replace(/\r\n/g, '\n');

  // Diffs are delimited in file by "// DIFF"
  return output
    .split(/\s*\/\/ DIFF/)
    .slice(1)
    .map(function (diff) {
      return diff.split('\n').filter(Boolean).join('\n');
    });
}
Returns content of test/integration/fixtures/diffs/output,
post-processed for consumption by tests.
@returns {string[]} Array of diff lines