Problem Mock & package.json

contracts/FundMe.sol

@@ -7,7 +7,7 @@
 pragma solidity ^0.8.0;
 
 import "./PriceConverter.sol";
-// Save Gas - constant, immutable
+// Save Gas by using constant, immutable for variables
 
 error NotOwner();
 

contracts/PriceConverter.sol

@@ -6,10 +6,6 @@ import "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.so
 // Why is this a library and not abstract?
 // Why not an interface?
 library PriceConverter {
-    // Sepolia ETH / USD Address
-    // https://docs.chain.link/data-feeds/price-feeds/addresses#Sepolia%20Testnet
-    //0x694AA1769357215DE4FAC081bf1f309aDC325306
-
     // We could make this public, but then we'd have to deploy it
     function getPrice(
         AggregatorV3Interface priceFeed

contracts/test/MockV3Aggregator.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.8;
+
+import "@chainlink/contracts/src/v0.8/tests/MockV3Aggregator.sol";
+
+// Direct import from the github, located at local node_modules