nim-ethers/testmodule/testErc20.nim

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import std/json
import pkg/asynctest
import pkg/questionable
import pkg/stint
import pkg/ethers
import pkg/ethers/erc20
import ./hardhat
type
TestToken = ref object of Erc20Token
method mint(token: TestToken, holder: Address, amount: UInt256): ?TransactionResponse {.base, contract.}
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for url in ["ws://localhost:8545", "http://localhost:8545"]:
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suite "ERC20 (" & url & ")":
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var token: Erc20Token
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var testToken: TestToken
var provider: JsonRpcProvider
var snapshot: JsonNode
var accounts: seq[Address]
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setup:
provider = JsonRpcProvider.new(url, pollingInterval = 100.millis)
snapshot = await provider.send("evm_snapshot")
accounts = await provider.listAccounts()
let deployment = readDeployment()
testToken = TestToken.new(!deployment.address(TestToken), provider.getSigner())
token = Erc20Token.new(!deployment.address(TestToken), provider.getSigner())
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teardown:
discard await provider.send("evm_revert", @[snapshot])
await provider.close()
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test "retrieves basic information":
check (await token.name()) == "TestToken"
check (await token.symbol()) == "TST"
check (await token.decimals()) == 12
check (await token.totalSupply()) == 0.u256
check (await token.balanceOf(accounts[0])) == 0.u256
check (await token.allowance(accounts[0], accounts[1])) == 0.u256
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test "transfer tokens":
check (await token.balanceOf(accounts[0])) == 0.u256
check (await token.allowance(accounts[0], accounts[1])) == 0.u256
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discard await testToken.mint(accounts[0], 100.u256)
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check (await token.totalSupply()) == 100.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.transfer(accounts[1], 50.u256)
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check (await token.balanceOf(accounts[0])) == 50.u256
check (await token.balanceOf(accounts[1])) == 50.u256
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test "approve tokens":
discard await testToken.mint(accounts[0], 100.u256)
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check (await token.allowance(accounts[0], accounts[1])) == 0.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.approve(accounts[1], 50.u256)
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check (await token.allowance(accounts[0], accounts[1])) == 50.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
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test "increase/decrease allowance":
discard await testToken.mint(accounts[0], 100.u256)
check (await token.allowance(accounts[0], accounts[1])) == 0.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.increaseAllowance(accounts[1], 50.u256)
check (await token.allowance(accounts[0], accounts[1])) == 50.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.increaseAllowance(accounts[1], 50.u256)
check (await token.allowance(accounts[0], accounts[1])) == 100.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.decreaseAllowance(accounts[1], 50.u256)
check (await token.allowance(accounts[0], accounts[1])) == 50.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
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test "transferFrom tokens":
let senderAccount = accounts[0]
let receiverAccount = accounts[1]
let receiverAccountSigner = provider.getSigner(receiverAccount)
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check (await token.balanceOf(senderAccount)) == 0.u256
check (await token.allowance(senderAccount, receiverAccount)) == 0.u256
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discard await testToken.mint(senderAccount, 100.u256)
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check (await token.totalSupply()) == 100.u256
check (await token.balanceOf(senderAccount)) == 100.u256
check (await token.balanceOf(receiverAccount)) == 0.u256
discard await token.approve(receiverAccount, 50.u256)
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check (await token.allowance(senderAccount, receiverAccount)) == 50.u256
check (await token.balanceOf(senderAccount)) == 100.u256
check (await token.balanceOf(receiverAccount)) == 0.u256
discard await token.connect(receiverAccountSigner).transferFrom(senderAccount, receiverAccount, 50.u256)
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check (await token.balanceOf(senderAccount)) == 50.u256
check (await token.balanceOf(receiverAccount)) == 50.u256
check (await token.allowance(senderAccount, receiverAccount)) == 0.u256