path: root/common/math/integer_test.go

// 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 TestHexOrDecimal64(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 {
        var num HexOrDecimal64
        err := num.UnmarshalText([]byte(test.input))
        if (err == nil) != test.ok {
            t.Errorf("ParseUint64(%q) -> (err == nil) = %t, want %t", test.input, err == nil, test.ok)
            continue
        }
        if err == nil && uint64(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")
}