nimbus-eth1/tests/test_misc.nim

import
  std/[os],
  unittest2, stew/byteutils,
  eth/common/eth_types,
  ../nimbus/vm_internals,
  ../nimbus/core/pow/header

func toAddress(n: int): EthAddress =
  result[19] = n.byte

func toAddress(a, b: int): EthAddress =
  result[18] = a.byte
  result[19] = b.byte

func toAddress(a, b, c: int): EthAddress =
  result[17] = a.byte
  result[18] = b.byte
  result[19] = c.byte

proc miscMain*() =
  suite "Misc test suite":
    test "EthAddress to int":
      check toAddress(0xff).toInt == 0xFF
      check toAddress(0x10, 0x0).toInt == 0x1000
      check toAddress(0x10, 0x0, 0x0).toInt == 0x100000

    test "calcGasLimitEIP1559":
      type
        GLT = object
          limit: GasInt
          max  : GasInt
          min  : GasInt

      const testData = [
        GLT(limit: 20000000, max: 20019530, min: 19980470),
        GLT(limit: 40000000, max: 40039061, min: 39960939)
      ]

      for x in testData:
        # Increase
        var have = calcGasLimit1559(x.limit, 2*x.limit)
        var want = x.max
        check have == want

        # Decrease
        have = calcGasLimit1559(x.limit, 0)
        want = x.min
        check have == want

        # Small decrease
        have = calcGasLimit1559(x.limit, x.limit-1)
        want = x.limit-1
        check have == want

        # Small increase
        have = calcGasLimit1559(x.limit, x.limit+1)
        want = x.limit+1
        check have == want

        # No change
        have = calcGasLimit1559(x.limit, x.limit)
        want = x.limit
        check have == want

when isMainModule:
  miscMain()