Add comprehensive transaction signing tests

[iradukun]

Current Date and Time (UTC - YYYY-MM-DD HH:MM:SS formatted): 2025-01-24 15:41:11
Current User's Login: iradukun

What was wrong?

The ethereum-tester provider was missing implementations for transaction signing test methods. Specifically, the following methods were marked as not_implemented:

• test_eth_sign_transaction_legacy
• test_eth_sign_transaction
• test_eth_sign_transaction_hex_fees

Related to Issue #
This implementation addresses the not_implemented methods in the TestEthereumTesterEthModule class.

How was it fixed?

Added comprehensive test implementations for transaction signing methods:

1. Added test_eth_sign_transaction_legacy:

   • Tests signing of pre-EIP-1559 transactions
   • Verifies signature components (r, s, v)
   • Ensures transaction can be properly serialized and sent

2. Added test_eth_sign_transaction:

   • Implements EIP-1559 transaction signing tests
   • Verifies maxFeePerGas and maxPriorityFeePerGas handling
   • Confirms proper transaction type encoding

3. Added test_eth_sign_transaction_hex_fees:

   • Tests hexadecimal fee value handling
   • Verifies correct conversion of hex values
   • Ensures compatibility with various input formats

The implementation follows project testing patterns and includes proper assertions for type checking and transaction validation.

Todo:

• Clean up commit history
• Add or update documentation related to these changes
• Add entry to the release notes

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Release Notes Entry:

# newsfragments/xxxx.feature.md
---
feature: |
  Added comprehensive test coverage for transaction signing methods in ethereum-tester provider:
  - Legacy transaction signing
  - EIP-1559 transaction signing
  - Hexadecimal fee value handling