在测试期间更改 VMContext 属性

Posted 2023-02-14

【中文标题】在测试期间更改 VMContext 属性

【英文标题】：Changing VMContext attributes during tests

【发布时间】：2020-03-16 07:29:42

【问题描述】：

我想编写需要能够在测试中更改前任帐户的测试。但我找不到动态更改 VMContext 的方法。

fn get_context(value: u128) -> VMContext 
        VMContext 
            current_account_id: "alice.near".to_string(),
            signer_account_id: "bob.near".to_string(),
            signer_account_pk: vec![0, 1, 2],
            predecessor_account_id: "carol.near".to_string(),
            input: vec![],
            block_index: 0,
            account_balance: 0,
            is_view: false,
            storage_usage: 0,
            block_timestamp: 123789,
            attached_deposit: value,
            prepaid_gas: 10u64.pow(9),
            random_seed: vec![0, 1, 2],
            output_data_receivers: vec![],
        
    

    #[test]
    fn test_market_creation() 
        let mut context = get_context(500000000);
        let config = Config::default();
        testing_env!(context, config);
        let mut contract = MyContract::default();
        contract.do_something(); // Fire method with "carol.near" as predecessor
        // Switch account to "bob.near"
        contract.do_something(); // Fire method with "bob.near" as predecessor
    

【参考方案1】：

当您在同一个测试中使用新上下文再次调用“testing_env！”时，它将保留旧存储，但使用新上下文。

查看可替代令牌示例https://github.com/nearprotocol/near-bindgen/blob/75a62c7c1fd46feda614c4e7776d02eeea054ef8/examples/fun-token/src/lib.rs#L395的测试

【参考方案2】：

VMContext 中的字段是公开的。应该可以更改它的任何字段：

#[test]
    fn test_market_creation() 
        let mut context = get_context(500000000);
        context.predecessor_account_id = "carol.near".to_string();
        let config = Config::default();
        testing_env!(context, config);
        let mut contract = MyContract::default();
        contract.do_something(); // Fire method with "carol.near" as predecessor
        // Switch account to "bob.near"
        contract.do_something(); // Fire method with "bob.near" as predecessor