Macro near_sdk::testing_env

macro_rules! testing_env {
    ($context:expr, $config:expr, $fee_config:expr, $validators:expr, $promise_results:expr $(,)?) => { ... };
    ($context:expr, $config:expr, $fee_config:expr, $validators:expr $(,)?) => { ... };
    ($context:expr, $config:expr, $fee_config:expr $(,)?) => { ... };
    ($context:expr, $config:expr $(,)?) => { ... };
    ($context:expr) => { ... };
}

Initializes a testing environment to mock interactions which would otherwise go through a validator node. This macro will initialize or overwrite the MockedBlockchain instance for interactions from a smart contract.

There are five parameters that can be accepted to configure the interface with a MockedBlockchain, in this order:

• context: VMContext which contains some core information about the blockchain and message data which can be used from the smart contract.
• config (optional): vm::Config which contains some additional information about the VM to configure parameters not directly related to the transaction being executed.
• fee_config(optional): RuntimeFeesConfig which configures the fees for execution and storage of transactions.
• validators(optional): a HashMap<AccountId, Balance> mocking the current validators of the blockchain.
• promise_results(optional): a Vec of PromiseResult which mocks the results of callback calls during the execution.

Any argument not included will use the default implementation of each.

Example use

use near_sdk::{testing_env, test_vm_config};
use near_sdk::test_utils::{accounts, VMContextBuilder};
use near_parameters::RuntimeFeesConfig;
use std::collections::HashMap;

// Initializing some context is required
let context = VMContextBuilder::new().signer_account_id(accounts(0)).build();

// Build with just the base context
testing_env!(context.clone());

// Or include arguments up to the five optional
testing_env!(
    context,
    test_vm_config(),
    RuntimeFeesConfig::test(),
    HashMap::default(),
    Vec::default(),
);