Added testing cheatsheet

Educational/hardHat/.gitignore

@@ -0,0 +1,3 @@
+node_modules
+.env
+package-lock.json

Educational/hardHat/artifacts/contracts/Token.sol/Token.dbg.json

@@ -0,0 +1,4 @@
+{
+  "_format": "hh-sol-dbg-1",
+  "buildInfo": "../../build-info/a211be2b-d9cf-40af-b99f-8f7db3739e3a.json"
+}

Educational/hardHat/artifacts/contracts/Token.sol/Token.json

@@ -0,0 +1,130 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "Token",
+  "sourceName": "contracts/Token.sol",
+  "abi": [
+    {
+      "inputs": [],
+      "stateMutability": "nonpayable",
+      "type": "constructor"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "transferEvent",
+      "type": "event"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "account",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "name",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "owner",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "symbol",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "totalSupply",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        }
+      ],
+      "name": "transfer",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
+  "bytecode": "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",
+  "deployedBytecode": "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",
+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}

Educational/hardHat/artifacts/hardhat/console.sol/console.dbg.json

@@ -0,0 +1,4 @@
+{
+  "_format": "hh-sol-dbg-1",
+  "buildInfo": "../../build-info/9ebf77ed-7109-4bf7-bb02-c30b5134d3b3.json"
+}

Educational/hardHat/artifacts/hardhat/console.sol/console.json

@@ -0,0 +1,10 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "console",
+  "sourceName": "hardhat/console.sol",
+  "abi": [],
+  "bytecode": "0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122099b443ac06edd1c29f7b1cb016373e00c8a0b490098b2633c81b92c0a302a53364736f6c63430007030033",
+  "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122099b443ac06edd1c29f7b1cb016373e00c8a0b490098b2633c81b92c0a302a53364736f6c63430007030033",
+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}

Educational/hardHat/cache/solidity-files-cache.json

@@ -0,0 +1,75 @@
+{
+  "_format": "hh-sol-cache-2",
+  "files": {
+    "/Users/veronicac/Desktop/projects/Ethereum/Educational/hardHat/contracts/Token.sol": {
+      "lastModificationDate": 1606909407584,
+      "contentHash": "601adc5e50fbddbd0b33f4ae25b9be6c",
+      "sourceName": "contracts/Token.sol",
+      "solcConfig": {
+        "version": "0.7.3",
+        "settings": {
+          "optimizer": {
+            "enabled": false,
+            "runs": 200
+          },
+          "outputSelection": {
+            "*": {
+              "*": [
+                "abi",
+                "evm.bytecode",
+                "evm.deployedBytecode",
+                "evm.methodIdentifiers"
+              ],
+              "": [
+                "ast"
+              ]
+            }
+          }
+        }
+      },
+      "imports": [
+        "hardhat/console.sol"
+      ],
+      "versionPragmas": [
+        "^0.7.0"
+      ],
+      "artifacts": [
+        "Token"
+      ]
+    },
+    "/Users/veronicac/Desktop/projects/Ethereum/Educational/hardHat/node_modules/hardhat/console.sol": {
+      "lastModificationDate": 1606902247272,
+      "contentHash": "c20b2460755f312099ccd61427237ded",
+      "sourceName": "hardhat/console.sol",
+      "solcConfig": {
+        "version": "0.7.3",
+        "settings": {
+          "optimizer": {
+            "enabled": false,
+            "runs": 200
+          },
+          "outputSelection": {
+            "*": {
+              "*": [
+                "abi",
+                "evm.bytecode",
+                "evm.deployedBytecode",
+                "evm.methodIdentifiers"
+              ],
+              "": [
+                "ast"
+              ]
+            }
+          }
+        }
+      },
+      "imports": [],
+      "versionPragmas": [
+        ">=0.4.22 <0.8.0"
+      ],
+      "artifacts": [
+        "console"
+      ]
+    }
+  }
+}

Educational/hardHat/contracts/Token.sol

@@ -0,0 +1,79 @@
+// Solidity files have to start with this pragma.
+// It will be used by the Solidity compiler to validate its version.
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+// Import the console log to be able to log variables within a call
+import "hardhat/console.sol";
+
+// This is the main building block for smart contracts.
+contract Token {
+    // Some string type variables to identify the token.
+    // The `public` modifier makes a variable readable from outside the contract.
+    string public name = "My Hardhat Token";
+    string public symbol = "MBT";
+
+    // The fixed amount of tokens stored in an unsigned integer type variable.
+    uint256 public totalSupply = 1000000;
+
+    // An address type variable is used to store ethereum accounts.
+    address public owner;
+
+    // A mapping is a key/value map. Here we store each account balance.
+    mapping(address => uint256) balances;
+
+    // An event
+    event transferEvent(address indexed from, address indexed to, uint256 amount);
+
+    /**
+     * Contract initialization.
+     *
+     * The `constructor` is executed only once when the contract is created.
+     */
+    constructor() {
+        // The totalSupply is assigned to transaction sender, which is the account
+        // that is deploying the contract.
+        balances[msg.sender] = totalSupply;
+        owner = msg.sender;
+    }
+
+    /**
+     * A function to transfer tokens.
+     *
+     * The `external` modifier makes a function *only* callable from outside
+     * the contract.
+     */
+    function transfer(address to, uint256 amount) external {
+        // Check if the transaction sender has enough tokens.
+        // If `require`'s first argument evaluates to `false` then the
+        // transaction will revert.
+        require(balances[msg.sender] >= amount, "Not enough tokens");
+
+        // Transfer the amount.
+        balances[msg.sender] -= amount;
+        balances[to] += amount;
+
+        /**
+            Uncomment to be able to console.log() variables from within solidity
+            smart contracts
+        */
+        // console.log("Sender balance is %s tokens", balances[msg.sender]);
+        // console.log("Trying to send %s tokens to %s", amount, to);
+
+        emit transferEvent(
+            msg.sender,
+            to,
+            amount
+        );
+    }
+
+    /**
+     * Read only function to retrieve the token balance of a given account.
+     *
+     * The `view` modifier indicates that it doesn't modify the contract's
+     * state, which allows us to call it without executing a transaction.
+     */
+    function balanceOf(address account) external view returns (uint256) {
+        return balances[account];
+    }
+}

Educational/hardHat/hardhat.config.js

@@ -0,0 +1,29 @@
+require("@nomiclabs/hardhat-waffle");
+// env reader
+require("dotenv").config();
+
+/**
+ * API key for using Infura. To generate keys go to https://infura.io/ 
+ * @notice  Never hard code API keys within a file that is tracked by git.
+ *          This file is tracked by git, as such we pull the API keys from
+ *          the `.env` file. 
+ */
+const INFURA_PROJECT_ID = process.env.INFURA_PROJECT_ID;
+
+/**
+ * Private key of deployer
+ * @notice  Never hard code private keys within a file that is tracked by git.
+ *          This file is tracked by git, as such we pull the private keys from
+ *          the `.env` file. 
+ */
+const ROPSTEN_PRIVATE_KEY = process.env.ROPSTEN_PRIVATE_KEY;
+
+module.exports = {
+  solidity: "0.7.3",
+  networks: {
+    ropsten: {
+      url: `https://ropsten.infura.io/v3/${INFURA_PROJECT_ID}`,
+      accounts: [`0x${ROPSTEN_PRIVATE_KEY}`]
+    }
+  }
+};

Educational/hardHat/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "hardHat",
+  "version": "1.0.0",
+  "main": "index.js",
+  "author": "@nicca42",
+  "license": "MIT",
+  "private": false,
+  "dependencies": {
+    "dotenv": "^8.2.0",
+    "hardhat": "^2.0.4"
+  },
+  "devDependencies": {
+    "@nomiclabs/hardhat-ethers": "^2.0.1",
+    "@nomiclabs/hardhat-waffle": "^2.0.1",
+    "chai": "^4.2.0",
+    "ethereum-waffle": "^3.2.1",
+    "ethers": "^5.0.23"
+  },
+  "scripts": {
+    "compile": "hardhat compile",
+    "test": "hardhat test",
+    "deploy:local": "hardhat run scripts/deploy.js",
+    "deploy:ropsten": "npx hardhat run scripts/deploy.js --network ropsten"
+  }
+}

Educational/hardHat/scripts/deploy.js

@@ -0,0 +1,27 @@
+// The deployment script
+const main = async (network) => {
+	// Getting the first signer as the deployer
+  const [deployer] = await ethers.getSigners();
+  // Saving the info to be logged in the table (deployer address)
+  var deployerLog = { Label: "Deploying Address", Info: deployer.address };
+	// Saving the info to be logged in the table (deployer address)
+  var deployerBalanceLog = { 
+    Label: "Deployer ETH Balance", 
+    Info: (await deployer.getBalance()).toString() 
+  };
+	// Gets the abi, bytecode & name of the contract
+	const Token = await ethers.getContractFactory("Token");
+	// Deploys the token
+  const token = await Token.deploy();
+	// Saving the info to be logged in the table (deployer address)
+  var tokenLog = { Label: "Deployed Token Address", Info: token.address };
+
+  console.table([deployerLog, deployerBalanceLog, tokenLog]);
+}
+// Runs the deployment script, catching any errors
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });