Testing
This module provides various helper functions for declaring, deploying,
and testing Smart Contracts using snforge toolchain from Starknet Foundry.
use openzeppelin_testing;The module isn’t part of the openzeppelin package and to be accessible has to
be added as a separate dependency in Scarb.toml:
[dev-dependencies]
openzeppelin_testing = { git = "https://github.com/OpenZeppelin/cairo-contracts.git", tag = "v0.16.0" }Test Utilities
common
A module providing common test helpers.
use openzeppelin_testing::common;panic_data_to_byte_array(panic_data: Array<felt252>) → ByteArray function
Converts panic data into a string (ByteArray).
panic_data is expected to be a valid serialized ByteArray with an extra felt252 at the beginning, which is the BYTE_ARRAY_MAGIC.
to_base_16_string(value: felt252) → ByteArray function
Converts a felt252 to a base16 string padded to 66 characters (including the 0x prefix).
assert_entrypoint_not_found_error<T, +Drop<T>>(result: SyscallResult<T>, selector: felt252, contract_address: ContractAddress) function
Asserts that the syscall result of a call failed with an "Entrypoint not found" error, following the Starknet Foundry emitted error format.
IntoBase16StringTrait trait
A helper trait that enables a value to be represented as a base16 string padded to 66 characters
(including the 0x prefix). The type of the value must implement Into<T, felt252> to be
convertible to felt252.
Usage example:
use openzeppelin_testing::common::IntoBase16String;
let expected_panic_message = format!(
"Entry point selector {} not found in contract {}",
selector.into_base_16_string(),
contract_address.into_base_16_string()
);deployment
use openzeppelin_testing::deployment;A module containing utilities that simplify declaring and deploying contracts using the snforge toolchain.
declare_class(contract_name: ByteArray) → ContractClass function
Declares a contract with a snforge declare call and unwraps the result.
deploy(contract_class: ContractClass, calldata: Array<felt252>) → ContractAddress function
Deploys an instance of a contract and unwraps the result.
deploy_at(contract_class: ContractClass, target_address: ContractAddress, calldata: Array<felt252>) function
Deploys an instance of a contract at a given address.
deploy_another_at(existing: ContractAddress, target_address: ContractAddress, calldata: Array<felt252>) function
Deploys a contract using the class hash from another already-deployed contract.
Note that currently, snforge does not support redeclaring a contract class. Consequently,
there is no direct method to deploy a second instance of a contract if neither its ContractClass
nor its class_hash is available in the context. This helper function provides a solution by retrieving
the class hash from an existing contract and using it to facilitate the deployment.
use openzeppelin_testing::deploy_another_at;
let alice_address = setup_account(array!['ALICE_PUBKEY']);
let bob_address = contract_address_const::<'BOB'>();
deploy_another_at(alice_address, bob_address, array!['BOB_PUBKEY']);events
use openzeppelin_testing::events;
use openzeppelin_testing::events::EventSpyExt;A module offering an extended set of functions for handling emitted events, enhancing the default
event utilities provided by snforge. These functions are accessible via the EventSpyExt
trait implemented on the EventSpy struct.
assert_only_event<T, +starknet::Event<T>, +Drop<T>>(ref self: EventSpy, from_address: ContractAddress, expected_event: T) function
Ensures that from_address has emitted only the expected_event and no additional events.
assert_emitted_single<T, +starknet::Event<T>, +Drop<T>>(ref self: EventSpy, from_address: ContractAddress, expected_event: T) function
Ensures that from_address has emitted the expected_event.
drop_event(ref self: EventSpy) function
Removes a single event from the queue. If the queue is empty, the function will panic.
drop_n_events(ref self: EventSpy, number_to_drop: u32) function
Removes number_to_drop events from the queue. If the queue is empty, the function will panic.
drop_all_events(ref self: EventSpy) function
Removes all events remaining on the queue. If the queue is empty already, the function will do nothing.
assert_no_events_left(ref self: EventSpy) function
Ensures that there are no events remaining on the queue.
signing
use openzeppelin_testing::signing;A module offering utility functions for easier management of key pairs and signatures.
get_stark_keys_from(private_key: felt252) → StarkKeyPair function
Builds a Stark key pair from a private key represented by a felt252 value.
get_secp256k1_keys_from(private_key: u256) → Secp256k1KeyPair function
Builds a Secp256k1 key pair from a private key represented by a u256 value.
SerializedSigning trait
A helper trait that facilitates signing and converting the result signature into a serialized format.
Usage example:
use openzeppelin_testing::signing::{
StarkKeyPair, get_stark_keys_from, StarkSerializedSigning
};
let key_pair = get_stark_keys_from('SECRET_KEY');
let serialized_signature = key_pair.serialized_sign('TX_HASH');