v8/test/mjsunit/es6/string-repeat.js

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assertEquals("000", String.prototype.repeat.call(0, 3));
assertEquals("-1-1-1", String.prototype.repeat.call(-1, 3));
assertEquals("2.12.12.1", String.prototype.repeat.call(2.1, 3));
assertEquals("", String.prototype.repeat.call([], 3));
assertEquals("1,2,3", String.prototype.repeat.call([1, 2, 3], 1));
assertEquals("true", String.prototype.repeat.call(true, 1));
assertEquals("false", String.prototype.repeat.call(false, 1));
assertEquals("[object Object]", String.prototype.repeat.call({}, 1));

assertEquals("000", String.prototype.repeat.apply(0, [3]));
assertEquals("-1-1-1", String.prototype.repeat.apply(-1, [3]));
assertEquals("2.12.12.1", String.prototype.repeat.apply(2.1, [3]));
assertEquals("", String.prototype.repeat.apply([], [3]));
assertEquals("1,2,3", String.prototype.repeat.apply([1, 2, 3], [1]));
assertEquals("true", String.prototype.repeat.apply(true, [1]));
assertEquals("false", String.prototype.repeat.apply(false, [1]));
assertEquals("[object Object]", String.prototype.repeat.apply({}, [1]));

assertEquals("\u10D8\u10D8\u10D8", "\u10D8".repeat(3));

assertThrows('String.prototype.repeat.call(null, 1)', TypeError);
assertThrows('String.prototype.repeat.call(undefined, 1)', TypeError);
assertThrows('String.prototype.repeat.apply(null, [1])', TypeError);
assertThrows('String.prototype.repeat.apply(undefined, [1])', TypeError);

// Test cases found in FF
assertEquals("abc", "abc".repeat(1));
assertEquals("abcabc", "abc".repeat(2));
assertEquals("abcabcabc", "abc".repeat(3));
assertEquals("aaaaaaaaaa", "a".repeat(10));
assertEquals("", "".repeat(5));
assertEquals("", "abc".repeat(0));
assertEquals("abcabc", "abc".repeat(2.0));

assertEquals("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "a".repeat(37));
assertThrows('"a".repeat(-1)', RangeError);
assertThrows('"a".repeat(Number.POSITIVE_INFINITY)', RangeError);
assertThrows('"a".repeat(Math.pow(2, 30))', RangeError);
assertThrows('"a".repeat(Math.pow(2, 40))', RangeError);

// Handling empty strings
assertThrows('"".repeat(-1)', RangeError);
assertThrows('"".repeat(Number.POSITIVE_INFINITY)', RangeError);
assertEquals("", "".repeat(Math.pow(2, 30)));
assertEquals("", "".repeat(Math.pow(2, 40)));

var myobj = {
  toString: function() {
    return "abc";
  },
  repeat : String.prototype.repeat
};
assertEquals("abc", myobj.repeat(1));
assertEquals("abcabc", myobj.repeat(2));