From 43e520b5e0664c03093851b1439fbcfbd7e991c1 Mon Sep 17 00:00:00 2001
From: Armando Andini <armando.andini@gmail.com>
Date: Mon, 20 Sep 2021 15:56:03 -0300
Subject: [PATCH] Built in vars

---
 misc/contracts/BuiltInVars.sol  | 32 ++++++++++++++++++++++++++++++++
 misc/test/built_in_vars_test.ts | 27 +++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 misc/contracts/BuiltInVars.sol
 create mode 100644 misc/test/built_in_vars_test.ts

diff --git a/misc/contracts/BuiltInVars.sol b/misc/contracts/BuiltInVars.sol
new file mode 100644
index 0000000..593a332
--- /dev/null
+++ b/misc/contracts/BuiltInVars.sol
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-3.0
+
+pragma solidity ^0.8.7;
+
+import "hardhat/console.sol";
+
+contract BuiltInVars {
+    constructor() {}
+
+    function printGlobals() public {
+        console.log("gasleft");
+        console.log(gasleft());
+        console.log("this");
+        console.log(address(this));
+        console.log("block.timestamp");
+        console.log(block.timestamp);
+        console.log("block.number");
+        console.log(block.number);
+        console.log("block.difficulty");
+        console.log(block.difficulty);
+        console.log("tx.gasprice");
+        console.log(tx.gasprice);
+    }
+
+    function countGas() public view returns (uint256) {
+        uint256 start = gasleft();
+        uint256 j = 1235 * 127396;
+        uint256 end = gasleft();
+
+        return start - end;
+    }
+}
diff --git a/misc/test/built_in_vars_test.ts b/misc/test/built_in_vars_test.ts
new file mode 100644
index 0000000..623a887
--- /dev/null
+++ b/misc/test/built_in_vars_test.ts
@@ -0,0 +1,27 @@
+const { expect } = require("chai");
+import { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers';
+import { BigNumber, Contract } from 'ethers';
+import hre, {ethers} from 'hardhat'
+
+describe("BuiltInVars", function () {
+  let contract: Contract;
+  let signer: SignerWithAddress;
+
+  beforeEach(async () => {
+    // Deploy contact
+    const factory = await ethers.getContractFactory("BuiltInVars");
+    contract = await factory.deploy();
+    await contract.deployed();
+
+    // Store signer
+    signer = (await ethers.getSigners())[0]
+  });
+
+  describe("function", function () {
+    it("prints globals", async () => {
+      await contract.printGlobals()
+
+      console.log(`Test gas consumption: ${await contract.countGas()}`)
+    });
+  });
+});
\ No newline at end of file