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https://github.com/logos-storage/nim-ethers.git
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78 lines
2.8 KiB
Nim
78 lines
2.8 KiB
Nim
import std/os
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import pkg/asynctest/chronos/unittest
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import pkg/ethers
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import pkg/serde
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import ./hardhat
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type
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TestGasEstimation = ref object of Contract
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proc getTime(contract: TestGasEstimation): UInt256 {.contract, view.}
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proc checkTimeEquals(contract: TestGasEstimation, expected: UInt256) {.contract.}
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suite "gas estimation":
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var contract: TestGasEstimation
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var provider: JsonRpcProvider
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var snapshot: JsonNode
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let providerUrl = getEnv("ETHERS_TEST_PROVIDER", "localhost:8545")
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setup:
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provider = JsonRpcProvider.new("http://" & providerUrl)
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snapshot = await provider.send("evm_snapshot")
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let deployment = readDeployment()
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let signer = provider.getSigner()
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contract = TestGasEstimation.new(!deployment.address(TestGasEstimation), signer)
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teardown:
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discard await provider.send("evm_revert", @[snapshot])
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await provider.close()
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test "contract function calls use pending block for gas estimations":
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let latest = CallOverrides(blockTag: some BlockTag.latest)
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let pending = CallOverrides(blockTag: some BlockTag.pending)
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# retrieve time of pending block
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let time = await contract.getTime(overrides=pending)
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# ensure that time of latest block and pending block differ
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check (await contract.getTime(overrides=latest)) != time
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# only succeeds when gas estimation is done using the pending block,
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# otherwise it will fail with "Transaction ran out of gas"
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await contract.checkTimeEquals(time)
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test "contract gas estimation uses pending block":
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let latest = CallOverrides(blockTag: some BlockTag.latest)
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let pending = CallOverrides(blockTag: some BlockTag.pending)
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# retrieve time of pending block
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let time = await contract.getTime(overrides=pending)
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# ensure that time of latest block and pending block differ
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check (await contract.getTime(overrides=latest)) != time
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# estimate gas
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let gas = await contract.estimateGas.checkTimeEquals(time)
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let overrides = TransactionOverrides(gasLimit: some gas)
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# only succeeds when gas estimation is done using the pending block,
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# otherwise it will fail with "Transaction ran out of gas"
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await contract.checkTimeEquals(time, overrides)
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test "contract gas estimation honors a block tag override":
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let latest = CallOverrides(blockTag: some BlockTag.latest)
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let pending = CallOverrides(blockTag: some BlockTag.pending)
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# retrieve time of pending block
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let time = await contract.getTime(overrides=pending)
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# ensure that time of latest block and pending block differ
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check (await contract.getTime(overrides=latest)) != time
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# estimate gas
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let gasLatest = await contract.estimateGas.checkTimeEquals(time, latest)
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let gasPending = await contract.estimateGas.checkTimeEquals(time, pending)
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check gasLatest != gasPending
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