Test Oracle Generator from Specification

WHAT IT DOES

Test Oracle Generator from Specification analyzes smart contract ABIs, source code, and user-provided specifications to produce automated test assertions—oracles—that can be used in test suites. It retrieves on-chain contract bytecode via eth_getCode and fetches verified source code and ABI from block explorer APIs to extract function signatures, state variable declarations, event definitions, and modifier structures. The tool then parses natural language or pseudo-code specifications provided by the user, mapping behavioral requirements to concrete ABI elements. It generates assertion statements in Solidity test syntax (or JavaScript for Hardhat/Truffle) that verify expected state transitions, return values, event emissions, and invariant properties. The output is a set of ready-to-use test oracles that can be pasted directly into test harnesses, significantly reducing the manual effort required to write comprehensive test suites for smart contracts.

HOW TO USE

Connect your BGWallet to the target EVM chain. Paste the contract address you wish to generate oracles for. Provide a specification in natural language or pseudo-code describing the expected behavior of key functions—for example, "transfer: sender balance decreases, recipient balance increases by the same amount; total supply remains constant." Optionally supply a GitHub repository URL to pull existing test suites, specification files, or test harnesses for context. The tool fetches the contract's ABI and source code, parses your specification, and generates a set of assertion-based oracles. Review the generated oracles, adapt them to your specific test framework, and integrate them into your test suite. The output includes per-function assertions, state checks, event verifications, and invariant validations.

BEHAVIORAL SPECIFICATION PARSING AND ABI MAPPING

The real technical mechanism is the behavioral specification parsing and ABI mapping engine. The tool uses a combination of natural language processing and structured pattern matching to extract behavioral rules from user-provided specifications. It identifies key actions (transfer, approve, mint) and their expected effects on state variables, balances, and events. The parser builds a semantic graph of state dependencies, linking each function to the state variables it reads or modifies. This graph is then projected onto the contract's ABI to generate precise assertions: for example, a "transfer" specification might produce assertions that check sender balance decreases by the transfer amount, recipient balance increases by the same amount, the Transfer event is emitted with correct parameters, and the total supply remains unchanged. The engine also supports invariant specifications—statements like "totalSupply never decreases" or "owner is never the zero address"—and generates appropriate invariants checks. For view and pure functions, it generates return value assertions using known test vectors derived from the ABI and any existing test data. The system uses a library of common Solidity patterns (ERC-20, ERC-721, Ownable) to provide template-based assertions when specifications are incomplete. This approach reduces manual test writing effort by an average of 70-80% and ensures that tests are systematically aligned with contract specifications.

WHAT IT CANNOT SEE

This tool cannot generate oracles without access to contract bytecode or ABI. It is limited by your RPC provider's rate limits for bytecode retrieval, which may delay analysis on congested networks. It cannot generate meaningful oracles for contracts with complex external dependencies or where the expected behavior is not fully specified in the ABI or source code—these contracts may require manual oracle design. The generation relies on the completeness of the ABI and source code verification; missing or incomplete verification data will produce incomplete or incorrect oracles. Generated oracles are based on static analysis and may not capture all edge cases or state-dependent invariants that only manifest during execution. The tool cannot prove the correctness of the generated oracles; all assertions should be reviewed by a developer before use. It may generate redundant or irrelevant test assertions for contracts with limited public interfaces, requiring manual pruning. The tool does not execute the contract to verify oracle accuracy; generated oracles are not automatically validated against live contract behavior.

PLEASE NOTE

This tool works exclusively with EVM-compatible chains. It requires active internet connectivity to access block explorer APIs and RPC endpoints. Some block explorers may require API keys for high-volume bytecode retrieval. The generator is read-only and does not modify or deploy any code—it only produces test assertions. Always review and validate generated oracles against your specific contract's logic and intended behavior before committing them to production test suites.