#9: works

Author: yegor256

.gitleaksignore

@@ -0,0 +1,2 @@
+hardhat/hardhat.config.js:generic-api-key:38
+hardhat/hardhat.config.js:generic-api-key:42

hardhat/.gitignore

@@ -2,4 +2,4 @@ artifacts/
 cache/
 node_modules/
 ignition/deployments/
-package-lock.json
+package-lock.json

hardhat/hardhat.config.js

@@ -1,7 +1,7 @@
 // Copyright (c) 2025 Yegor Bugayenko
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the 'Software'), to deal
+// of this software and associated documentation files (the "Software"), to deal
 // in the Software without restriction, including without limitation the rights
 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 // copies of the Software, and to permit persons to whom the Software is
@@ -10,7 +10,7 @@
 // The above copyright notice and this permission notice shall be included in all
 // copies or substantial portions of the Software.
 //
-// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFINGEMENT. IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
@@ -20,7 +20,7 @@
 
 require("@nomicfoundation/hardhat-toolbox");
 
-/** @type import('hardhat/config').HardhatUserConfig */
+/** @type import("hardhat/config").HardhatUserConfig */
 
 module.exports = {
   solidity: "0.8.28",
@@ -33,9 +33,16 @@ module.exports = {
       maxFeePerGas: 100,
       maxPriorityFeePerGas: 100,
       initialBaseFeePerGas: 100,
-      accounts: {
-        count: 1
-      }
+      accounts: [
+        {
+          privateKey: "81a9b2114d53731ecc84b261ef6c0387dde34d5907fe7b441240cc21d61bf80a",
+          balance: "55555555555555555555555"
+        },
+        {
+          privateKey: "91f9111b1744d55361e632771a4e53839e9442a9fef45febc0a5c838c686a15b",
+          balance: "66666666666666666666666"
+        }
+      ]
     },
     foo: {
       chainId: 4242,

lib/erc20/wallet.rb

@@ -38,11 +38,13 @@ class ERC20::Wallet
   # Constructor.
   # @param [String] contract Hex of the contract in Etherium
   # @param [String] rpc The URL of Etherium JSON-RPC provider
+  # @param [Integer] chain The ID of the chain (1 for mainnet)
   # @param [Object] log The destination for logs
-  def initialize(contract: USDT, rpc: '', log: $stdout)
+  def initialize(contract: USDT, rpc: '', chain: 1, log: $stdout)
     @contract = contract
     @rpc = rpc
     @log = log
+    @chain = chain
   end
 
   # Get balance of a public address.
@@ -73,16 +75,15 @@ def pay(priv, address, amount)
     key = Eth::Key.new(priv: priv)
     from = key.address
     nonce = client.eth_getTransactionCount(from, 'pending').to_i(16)
-    gas = client.eth_estimateGas({ from:, to: @contract, data: data}, 'latest').to_i(16)
-    @log.info("Gas: #{gas}")
+    gas = client.eth_estimateGas({ from:, to: @contract, data: data }, 'latest').to_i(16)
     tx = Eth::Tx.new({
       nonce:,
-      gas_price: 1000,
-      gas_limit: gas * 100,
+      gas_price: 99,
+      gas_limit: gas,
       to: @contract,
       value: 0,
       data: data,
-      chain_id: 4242
+      chain_id: @chain
     })
     tx.sign(key)
     client.eth_sendRawTransaction("0x" + tx.hex)

test/erc20/test_wallet.rb

@@ -76,7 +76,7 @@ def test_checks_balance_on_testnet
   def test_checks_balance_on_hardhat
     on_hardhat do |wallet|
       b = wallet.balance(Eth::Key.new(priv: JEFF).address.to_s)
-      assert_equal(123_000_000_000, b)
+      assert_equal(123_000_100_000, b)
     end
   end
 
@@ -88,7 +88,7 @@ def test_pays_on_hardhat
       from = Eth::Key.new(priv: JEFF).address.to_s
       assert(wallet.balance(from) > sum * 2)
       wallet.pay(JEFF, to, sum)
-      assert_equal(before - sum, wallet.balance(to))
+      assert_equal(before + sum, wallet.balance(to))
     end
   end
 
@@ -159,7 +159,7 @@ def on_hardhat
         home: File.join(__dir__, '../../hardhat'),
         ports: { port => 8545 },
         command: 'npx hardhat node',
-        log: Loog::VERBOSE
+        log: Loog::NULL
       ) do
         wait_for(port)
         cmd = [
@@ -172,13 +172,13 @@ def on_hardhat
           home: File.join(__dir__, '../../hardhat'),
           command: "/bin/bash -c #{Shellwords.escape(cmd)}",
           build_args: { 'HOST' => donce_host, 'PORT' => port },
-          log: Loog::VERBOSE,
+          log: Loog::NULL,
           root: true
         ).split("\n").last
         wallet = ERC20::Wallet.new(
-          contract:,
+          contract:, chain: 4242,
           rpc: "http://localhost:#{port}",
-          log: Loog::VERBOSE
+          log: Loog::NULL
         )
         yield wallet
       end