1// Copyright JS Foundation and other contributors, http://js.foundation 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15assert( isNaN (Math.log(NaN)) ); 16assert( isNaN (Math.log (-1)) ); 17assert( isNaN (Math.log (-Infinity)) ); 18 19assert( Math.log (0) === -Infinity ); 20assert( Math.log (1) === 0 ); 21assert( Math.log (Infinity) === Infinity ); 22assert( Math.log (2) >= Math.LN2 * 0.999999 ); 23assert( Math.log (2) <= Math.LN2 * 1.000001 ); 24 25var very_close_to_1_but_greater = 1.0000001; 26assert( very_close_to_1_but_greater > 1.0 ); 27 28assert( Math.log (very_close_to_1_but_greater) >= 0.0 ); 29assert( Math.log (very_close_to_1_but_greater) <= 0.000001 ); 30 31var very_close_to_1_but_less = 0.999999; 32assert( very_close_to_1_but_less < 1.0 ); 33 34assert( Math.log (very_close_to_1_but_less) <= 0.0 ); 35assert( Math.log (very_close_to_1_but_less) >= -0.00001 ); 36 37assert( Math.log (2.7182818284590452354) >= 0.999999 ); 38assert( Math.log (2.7182818284590452354) <= 1.000001 ); 39 40assert( Math.log (0.000000001) <= 0.999999 * (-20.7232658369) ); 41assert( Math.log (0.000000001) >= 1.000001 * (-20.7232658369) ); 42 43assert( Math.log (1.0e+38) >= 0.999999 * 87.4982335338 ); 44assert( Math.log (1.0e+38) <= 1.000001 * 87.4982335338 ); 45