Question

＆＃39;中的代码如何失败？＆＃39;阻止工作？我知道它是一个闭包，但无论我调用是否正在使用其签名，代码都会被调用。此外，＆＃34; ReadOnlyPropertyException＆＃34;的处理是什么？出现在括号中？如果它是一个参数，那么它不会像官方文档中列出的那样设置!!

问题：什么是＆＃39; shouldFail＆＃39;？应该怎么调用？如何处理这个方法/函数/闭包据称抛出的异常？

void test02_ReadOnlyFieldInGroovyBean() {
    // You've probably noticed how Groovy automatically generates getters/setters for you. But what if you don't
    // want to generate a setter because it's a read-only field? Just mark it with 'final'. Groovy will understand.

    // Try to modify Ken's ssn. You should get a ReadOnlyPropertyException.
    def person = new GroovyPerson('Ken', 'Kousen', '7878')
    def failed = false

    shouldFail (ReadOnlyPropertyException) {
        // ------------ START EDITING HERE ----------------------
        System.out.println(" i am in should fail")
        person.ssn='8332';
        // ------------ STOP EDITING HERE  ----------------------
        failed = false
        System.out.println(" exiting should fail")
    }

    //def foobar=shouldFail("hjh");
    //def foobar=true;
    failed=shouldFail('abc');

    //System.out.println("Failed: "+failed);
    assert failed

    // The code wrapping your additions verifies that the ReadOnlyProperty exception has been thrown.
    // The curly brackets ({}) represent a closure. We'll get into what that means very soon.
}

Answer 1

shouldFail()（在此变体中）接受一个类和一个闭包。它运行闭包并报告测试失败，如果闭包没有通过抛出该类型的异常而退出。至于捕获异常，你不会 - shouldFail()为你做这件事。

请参阅：http://docs.groovy-lang.org/latest/html/gapi/groovy/test/GroovyAssert.html#shouldFail%28java.lang.Class,%20groovy.lang.Closure%29

（阅读评论及其周围的代码，看起来这个单元测试应传递，因为设置.ssn的{{1}}属性会失败因为它是一个只读属性，导致GroovyPerson。）

在常规中什么是shouldFail？

1 个答案: