In Progress Add Mock

contracts/PriceConverter.sol

@@ -6,13 +6,14 @@ 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() internal view returns (uint256) {
-        // Sepolia ETH / USD Address
-        // https://docs.chain.link/data-feeds/price-feeds/addresses#Sepolia%20Testnet
-        AggregatorV3Interface priceFeed = AggregatorV3Interface(
-            0x694AA1769357215DE4FAC081bf1f309aDC325306
-        );
+    function getPrice(
+        AggregatorV3Interface priceFeed
+    ) internal view returns (uint256) {
         (, int256 answer, , , ) = priceFeed.latestRoundData();
         // ETH/USD rate in 18 digit
         return uint256(answer * 10000000000);
@@ -22,9 +23,10 @@ library PriceConverter {
 
     // 1000000000
     function getConversionRate(
-        uint256 ethAmount
+        uint256 ethAmount,
+        AggregatorV3Interface priceFeed
     ) internal view returns (uint256) {
-        uint256 ethPrice = getPrice();
+        uint256 ethPrice = getPrice(priceFeed);
         uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
         // or (Both will do the same thing)
         // uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1e18; // 1 * 10 ** 18 == 1000000000000000000