How to use the @0x/contracts-staking.artifacts.ReadOnlyProxy function in @0x/contracts-staking

environment: BlockchainTestsEnvironment,
        owner: string,
        txDefaults: Partial,
        tokens: TokenContracts,
        assetProxies: AssetProxyContracts,
    ): Promise {
        const zrxVault = await ZrxVaultContract.deployFrom0xArtifactAsync(
            stakingArtifacts.ZrxVault,
            environment.provider,
            txDefaults,
            stakingArtifacts,
            assetProxies.erc20Proxy.address,
            tokens.zrx.address,
        );
        const readOnlyProxy = await ReadOnlyProxyContract.deployFrom0xArtifactAsync(
            stakingArtifacts.ReadOnlyProxy,
            environment.provider,
            txDefaults,
            stakingArtifacts,
        );
        const stakingLogic = await TestStakingContract.deployFrom0xArtifactAsync(
            stakingArtifacts.TestStaking,
            environment.provider,
            txDefaults,
            stakingArtifacts,
            tokens.weth.address,
            tokens.zrx.address,
        );
        const stakingProxy = await StakingProxyContract.deployFrom0xArtifactAsync(
            stakingArtifacts.StakingProxy,
            environment.provider,
            txDefaults,