test/mjsunit/es6/math-log2-log10.js

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[Math.log10, Math.log2].forEach( function(fun) {
  assertTrue(isNaN(fun(NaN)));
  assertTrue(isNaN(fun(fun)));
  assertTrue(isNaN(fun({ toString: function() { return NaN; } })));
  assertTrue(isNaN(fun({ valueOf: function() { return -1; } })));
  assertTrue(isNaN(fun({ valueOf: function() { return "abc"; } })));
  assertTrue(isNaN(fun(-0.1)));
  assertTrue(isNaN(fun(-1)));
  assertEquals("-Infinity", String(fun(0)));
  assertEquals("-Infinity", String(fun(-0)));
  assertEquals(0, fun(1));
  assertEquals("Infinity", String(fun(Infinity)));
});

for (var i = -300; i < 300; i += 0.7) {
  assertEqualsDelta(i, Math.log10(Math.pow(10, i)), 1E-13);
  assertEqualsDelta(i, Math.log2(Math.pow(2, i)), 1E-13);
}