// Copyright 2022 The go-ethereum Authors // This file is part of the go-ethereum library. // // The go-ethereum library is free software: you can redistribute it and/or modify // it under the terms of the GNU Lesser General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // The go-ethereum library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public License // along with the go-ethereum library. If not, see . package misc import ( "testing" "github.com/holiman/uint256" ) func TestFakeExponential(t *testing.T) { var tests = []struct { factor, num, denom uint64 want uint64 }{ // When num==0 the return value should always equal the value of factor {1, 0, 1, 1}, {38493, 0, 1000, 38493}, {0, 1234, 2345, 0}, // should be 0 {1, 2, 1, 6}, // approximate 7.389 {1, 4, 2, 6}, {1, 3, 1, 16}, // approximate 20.09 {1, 6, 2, 18}, {1, 4, 1, 49}, // approximate 54.60 {1, 8, 2, 50}, {10, 8, 2, 542}, // approximate 540.598 {11, 8, 2, 596}, // approximate 600.58 {1, 5, 1, 136}, // approximate 148.4 {1, 5, 2, 11}, // approximate 12.18 {2, 5, 2, 23}, // approximate 24.36 } for _, tt := range tests { factor := uint256.NewInt(tt.factor) denom := uint256.NewInt(tt.denom) result, err := FakeExponential(factor, denom, tt.num) if err != nil { t.Error(err) } //t.Logf("%v*e^(%v/%v): %v", factor, num, denom, result) if tt.want != result.ToBig().Uint64() { t.Errorf("got %v want %v", result, tt.want) } } }