tests: add eip1559 solidity test (#656)

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

tests/solidity/suites/eip1559/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "eip1559",
+  "version": "1.0.0",
+  "license": "GPL-3.0-or-later",
+  "scripts": {
+    "test-ganache": "yarn truffle test",
+    "test-ethermint": "yarn truffle test --network ethermint"
+  },
+  "devDependencies": {
+    "truffle": "^5.4.14",
+    "truffle-assertions": "^0.9.2"
+  },
+  "dependencies": {
+    "@truffle/hdwallet-provider": "^1.5.1-alpha.1"
+  }
+}

tests/solidity/suites/eip1559/test/eip1559.js

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+contract('Transaction', async function(accounts) {
+
+  it('should send a transaction with EIP-1559 flag', async function() {
+    console.log(`Accounts: `, accounts);
+    console.log(web3.version);
+    const tx = await web3.eth.sendTransaction({
+      from: accounts[0],
+      to: !!accounts[1] ? accounts[1] : "0x0000000000000000000000000000000000000000",
+      value: '10000000',
+      gas: '21000',
+      type: "0x2",
+      common: {
+        hardfork: 'london'
+      }
+    });
+    console.log(tx);
+    assert.equal(tx.type, '0x2', 'Tx type should be 0x2');
+  });
+
+});

tests/solidity/suites/eip1559/truffle-config.js

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+// const HDWalletProvider = require('@truffle/hdwallet-provider');
+
+module.exports = {
+  networks: {
+    // Development network is just left as truffle's default settings
+    ethermint: {
+      host: "127.0.0.1",     // Localhost (default: none)
+      port: 8545,            // Standard Ethereum port (default: none)
+      network_id: "*",       // Any network (default: none)
+      gas: 5000000,          // Gas sent with each transaction
+      gasPrice: 1000000000,  // 1 gwei (in wei)
+    },
+  },
+  compilers: {
+    solc: {
+      version: "0.5.17",
+    },
+  },
+}