added some MARK

Author: albertopeam

Tests/web3swiftTests/localTests/BIP44Tests.swift

@@ -167,13 +167,17 @@ final class BIP44Tests: XCTestCase {
     }
 }
 
-class BIP44ErrorTests: XCTestCase {
+// MARK: - BIP44ErrorTests
+
+final class BIP44ErrorTests: XCTestCase {
     func testLocalizedDescription() {
         let error = BIP44Error.warning
         XCTAssertEqual(error.localizedDescription, "Couldn't derive key as it doesn't have a previous account with at least one transaction")
     }
 }
 
+// MARK: - helper
+
 private extension Bool {
     func times(n: Int) -> [Bool] {
         var array: [Bool] = .init()
@@ -184,6 +188,8 @@ private extension Bool {
     }
 }
 
+// MARK: - test double
+
 private final class MockTransactionChecker: TransactionChecker {
     var addresses: [String] = .init()
     var results: [Bool] = .init()