src/v8/test/intl/date-format/format-is-bound.js

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// Create default DateTimeFormat.
var dtf = new Intl.DateTimeFormat();

// Array we want to iterate, actual dates are not important.
var dateArray = [Date.now(), Date.now(), Date.now()];

// It shouldn't throw.
// The format() method should be properly bound to the dtf object.
dateArray.forEach(dtf.format);

// Formatting a date should work in a direct call.
dtf.format();

// format should be bound properly even if created from a non-instance
var legacy = Intl.DateTimeFormat.call(
    Object.create(Intl.DateTimeFormat));
var boundFormat = legacy.format;
assertEquals(dtf.format(12345), legacy.format(12345));
assertEquals(dtf.format(54321), boundFormat(54321));