indefinite article placed properly

Author: mcmoodoo

public/content/developers/docs/smart-contracts/testing/index.md

@@ -110,7 +110,7 @@ function auctionEnd() external {
 
 This is a simple auction contract designed to receive bids during the bidding period. If the `highestBid` increases, the previous highest bidder receives their money; once the bidding period is over, the `beneficiary` calls the contract to get their money.
 
-Unit tests for a contract like this would cover different functions a user might call when interacting with the contract. An example would be unit a test that checks if a user can place a bid while the auction is ongoing (i.e., calls to `bid()` succeed) or one that checks if a user can place a higher bid than the current `highestBid`.
+Unit tests for a contract like this would cover different functions a user might call when interacting with the contract. An example would be a unit test that checks if a user can place a bid while the auction is ongoing (i.e., calls to `bid()` succeed) or one that checks if a user can place a higher bid than the current `highestBid`.
 
 Understanding a contracts operational workflow also helps with writing unit tests that check if execution meet requirements. For example, the auction contract specifies that users cannot place bids when the auction has ended (i.e., when `auctionEndTime` is lower than `block.timestamp`). Thus, a developer might run a unit test that checks if calls to the `bid()` function succeed or fail when the auction is over (i.e., when `auctionEndTime` > `block.timestamp`).