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// Copyright 2017 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 <http://www.gnu.org/licenses/>.
package math
import (
"testing"
)
type operation byte
const (
sub operation = iota
add
mul
)
func TestOverflow(t *testing.T) {
for i, test := range []struct {
x uint64
y uint64
overflow bool
op operation
}{
// add operations
{MaxUint64, 1, true, add},
{MaxUint64 - 1, 1, false, add},
// sub operations
{0, 1, true, sub},
{0, 0, false, sub},
// mul operations
{0, 0, false, mul},
{10, 10, false, mul},
{MaxUint64, 2, true, mul},
{MaxUint64, 1, false, mul},
} {
var overflows bool
switch test.op {
case sub:
_, overflows = SafeSub(test.x, test.y)
case add:
_, overflows = SafeAdd(test.x, test.y)
case mul:
_, overflows = SafeMul(test.x, test.y)
}
if test.overflow != overflows {
t.Errorf("%d failed. Expected test to be %v, got %v", i, test.overflow, overflows)
}
}
}
func TestParseUint64(t *testing.T) {
tests := []struct {
input string
num uint64
ok bool
}{
{"", 0, true},
{"0", 0, true},
{"0x0", 0, true},
{"12345678", 12345678, true},
{"0x12345678", 0x12345678, true},
{"0X12345678", 0x12345678, true},
// Tests for leading zero behaviour:
{"0123456789", 123456789, true}, // note: not octal
{"0x00", 0, true},
{"0x012345678abc", 0x12345678abc, true},
// Invalid syntax:
{"abcdef", 0, false},
{"0xgg", 0, false},
// Doesn't fit into 64 bits:
{"18446744073709551617", 0, false},
}
for _, test := range tests {
num, ok := ParseUint64(test.input)
if ok != test.ok {
t.Errorf("ParseUint64(%q) -> ok = %t, want %t", test.input, ok, test.ok)
continue
}
if ok && num != test.num {
t.Errorf("ParseUint64(%q) -> %d, want %d", test.input, num, test.num)
}
}
}
func TestMustParseUint64(t *testing.T) {
if v := MustParseUint64("12345"); v != 12345 {
t.Errorf(`MustParseUint64("12345") = %d, want 12345`, v)
}
}
func TestMustParseUint64Panic(t *testing.T) {
defer func() {
if recover() == nil {
t.Error("MustParseBig should've panicked")
}
}()
MustParseUint64("ggg")
}
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