go-ethereum/core/vm/gas_table_test.go

package vm

import (
	"math"
	"testing"
)

func TestMemoryGasCost(t *testing.T) {
	size := uint64(math.MaxUint64 - 64)
	_, err := memoryGasCost(&Memory{}, size)
	if err != nil {
		t.Error("didn't expect error:", err)
	}

	_, err = memoryGasCost(&Memory{}, size+32)
	if err != nil {
		t.Error("didn't expect error:", err)
	}

	_, err = memoryGasCost(&Memory{}, size+33)
	if err == nil {
		t.Error("expected error")
	}
}
params: core, core/vm, miner: 64bit gas instructions Reworked the EVM gas instructions to use 64bit integers rather than arbitrary size big ints. All gas operations, be it additions, multiplications or divisions, are checked and guarded against 64 bit integer overflows. In additon, most of the protocol paramaters in the params package have been converted to uint64 and are now constants rather than variables. * common/math: added overflow check ops * core: vmenv, env renamed to evm * eth, internal/ethapi, les: unmetered eth_call and cancel methods * core/vm: implemented big.Int pool for evm instructions * core/vm: unexported intPool methods & verification methods * core/vm: added memoryGasCost overflow check and test 8 years ago			`package vm`

			`import (`
			`"math"`
			`"testing"`
			`)`

			`func TestMemoryGasCost(t *testing.T) {`
			`size := uint64(math.MaxUint64 - 64)`
			`_, err := memoryGasCost(&Memory{}, size)`
			`if err != nil {`
			`t.Error("didn't expect error:", err)`
			`}`

			`_, err = memoryGasCost(&Memory{}, size+32)`
			`if err != nil {`
			`t.Error("didn't expect error:", err)`
			`}`

			`_, err = memoryGasCost(&Memory{}, size+33)`
			`if err == nil {`
			`t.Error("expected error")`
			`}`
			`}`