chore: XCTAsserts added + removed empty lines

Author: JeneaVranceanu

Tests/web3swiftTests/localTests/UserCases.swift

@@ -25,8 +25,7 @@ class UserCases: XCTestCase {
         let readTransaction = contract.createReadOperation("balanceOf", parameters: [account] as [AnyObject])!
         readTransaction.transaction.from = account
         let response = try await readTransaction.callContractMethod()
-        let balance = response["0"] as? BigUInt
-        
+        XCTAssertNotNil(response["0"] as? BigUInt)
     }
 
     func testUserCase2() async {
@@ -88,23 +87,17 @@ class UserCases: XCTestCase {
         let receipt = try await web3.eth.transactionReceipt(txHash)
 
         XCTAssert(receipt.contractAddress != nil)
-
-        switch receipt.status {
-        case .notYetProcessed:
-            return
-        default:
-            break
+        if case .notYetProcessed = receipt.status {
+            throw Web3Error.processingError(desc: "Transaction is not yet complete")
         }
 
         let details = try await web3.eth.transactionDetails(txHash)
-        
         XCTAssert(details.transaction.to == .contractDeploymentAddress())
     }
 
     func testNonBatchedRequest() async throws {
         let web3 = try await Web3.new(LocalTestCase.url)
         let address = EthereumAddress("0xe22b8979739D724343bd002F9f432F5990879901")!
-        let balanceResult = try await web3.eth.getBalance(for: address)
-        
+        _ = try await web3.eth.getBalance(for: address)
     }
 }