// SPDX-FileCopyrightText: 2014 Samsung Electronics Co., Ltd.
// SPDX-License-Identifier: Apache-2.0

assert( isNaN (Math.log(NaN)) );
assert( isNaN (Math.log (-1)) );
assert( isNaN (Math.log (-Infinity)) );

assert( Math.log (0) === -Infinity );
assert( Math.log (1) === 0 );
assert( Math.log (Infinity) === Infinity );
assert( Math.log (2) >= Math.LN2 * 0.999999 );
assert( Math.log (2) <= Math.LN2 * 1.000001 );

var very_close_to_1_but_greater = 1.0000001;
assert( very_close_to_1_but_greater > 1.0 );

assert( Math.log (very_close_to_1_but_greater) >= 0.0 );
assert( Math.log (very_close_to_1_but_greater) <= 0.000001 );

var very_close_to_1_but_less = 0.999999;
assert( very_close_to_1_but_less < 1.0 );

assert( Math.log (very_close_to_1_but_less) <= 0.0 );
assert( Math.log (very_close_to_1_but_less) >= -0.00001 );

assert( Math.log (2.7182818284590452354) >= 0.999999 );
assert( Math.log (2.7182818284590452354) <= 1.000001 );

assert( Math.log (0.000000001) <= 0.999999 * (-20.7232658369) );
assert( Math.log (0.000000001) >= 1.000001 * (-20.7232658369) );

assert( Math.log (1.0e+38) >= 0.999999 * 87.4982335338 );
assert( Math.log (1.0e+38) <= 1.000001 * 87.4982335338 );
