test: estimate gas for native erc20 token

tests/src/eth/nativeRpc/estimateGas.test.ts

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+// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.
+// This file is part of Unique Network.
+
+// Unique Network is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Unique Network is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
+
+import {expect, itEth, usingEthPlaygrounds} from '../util';
+import {IKeyringPair} from '@polkadot/types/types';
+
+
+describe('Ethereum native RPC calls', () => {
+  let donor: IKeyringPair;
+  const NATIVE_TOKEN_ADDRESS = '0x17c4e6453cc49aaaaeaca894e6d9683e00000000';
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = await privateKey({url: import.meta.url});
+    });
+  });
+
+  itEth.only('estimate gas', async ({helper}) => {
+    const BALANCE = 100n;
+    const BALANCE_TO_TRANSFER = 90n;
+
+    const owner = await helper.eth.createAccountWithBalance(donor, BALANCE);
+    const recepient = helper.eth.createAccount();
+
+    const web3 = helper.getWeb3();
+    // data: transfer(recepient, 90);
+    const data = web3.eth.abi.encodeFunctionCall({
+      name: 'transfer',
+      type: 'function',
+      inputs: [{
+        type: 'address',
+        name: 'to',
+      },{
+        type: 'uint256',
+        name: 'amount',
+      }],
+    }, [recepient, (BALANCE_TO_TRANSFER * (10n ** 18n)).toString()]);
+
+    const estimateGas = await web3.eth.estimateGas({
+      to: NATIVE_TOKEN_ADDRESS,
+      value: '0x0',
+      data,
+      from: owner,
+      maxFeePerGas: '0x14c9338c61d',
+    });
+
+    expect(estimateGas).to.be.greaterThan(40000).and.to.be.lessThan(60000);
+  });
+});