src/v8/test/mjsunit/math-sqrt.js

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// Tests the special cases specified by ES 15.8.2.17

function test(expected_sqrt, value) {
  assertEquals(expected_sqrt, Math.sqrt(value));
  if (isFinite(value)) {
    if (value === 0 && (1 / value) == -Infinity) {
      // Math.pow(-0, 0.5) must be zero, but Math.sqrt(-0) is -0.
      expected_sqrt = 0;
    }
    assertEquals(expected_sqrt, Math.pow(value, 0.5));
  }
}

// Simple sanity check
test(2, 4);
test(0.1, 0.01);

// Spec tests
test(NaN, NaN);
test(NaN, -1);
test(+0, +0);
test(-0, -0);
test(Infinity, Infinity);
// -Infinity is smaller than 0 so it should return NaN
test(NaN, -Infinity);