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115 lines
2.8 KiB
115 lines
2.8 KiB
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package math
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import (
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"testing"
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)
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type operation byte
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const (
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sub operation = iota
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add
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mul
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)
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func TestOverflow(t *testing.T) {
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for i, test := range []struct {
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x uint64
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y uint64
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overflow bool
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op operation
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}{
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// add operations
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{MaxUint64, 1, true, add},
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{MaxUint64 - 1, 1, false, add},
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// sub operations
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{0, 1, true, sub},
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{0, 0, false, sub},
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// mul operations
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{0, 0, false, mul},
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{10, 10, false, mul},
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{MaxUint64, 2, true, mul},
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{MaxUint64, 1, false, mul},
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} {
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var overflows bool
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switch test.op {
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case sub:
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_, overflows = SafeSub(test.x, test.y)
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case add:
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_, overflows = SafeAdd(test.x, test.y)
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case mul:
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_, overflows = SafeMul(test.x, test.y)
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}
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if test.overflow != overflows {
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t.Errorf("%d failed. Expected test to be %v, got %v", i, test.overflow, overflows)
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}
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}
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}
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func TestParseUint64(t *testing.T) {
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tests := []struct {
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input string
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num uint64
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ok bool
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}{
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{"", 0, true},
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{"0", 0, true},
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{"0x0", 0, true},
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{"12345678", 12345678, true},
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{"0x12345678", 0x12345678, true},
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{"0X12345678", 0x12345678, true},
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// Tests for leading zero behaviour:
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{"0123456789", 123456789, true}, // note: not octal
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{"0x00", 0, true},
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{"0x012345678abc", 0x12345678abc, true},
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// Invalid syntax:
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{"abcdef", 0, false},
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{"0xgg", 0, false},
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// Doesn't fit into 64 bits:
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{"18446744073709551617", 0, false},
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}
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for _, test := range tests {
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num, ok := ParseUint64(test.input)
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if ok != test.ok {
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t.Errorf("ParseUint64(%q) -> ok = %t, want %t", test.input, ok, test.ok)
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continue
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}
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if ok && num != test.num {
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t.Errorf("ParseUint64(%q) -> %d, want %d", test.input, num, test.num)
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}
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}
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}
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func TestMustParseUint64(t *testing.T) {
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if v := MustParseUint64("12345"); v != 12345 {
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t.Errorf(`MustParseUint64("12345") = %d, want 12345`, v)
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}
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}
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func TestMustParseUint64Panic(t *testing.T) {
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defer func() {
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if recover() == nil {
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t.Error("MustParseBig should've panicked")
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}
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}()
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MustParseUint64("ggg")
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}
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