本文介绍了Dart如何模拟程序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ 如何进行嘲笑程序（如同函式一样，请参阅这里） 例如，给定以下typedef和过程， int useAdder（加法器）{返回加法器（1,2）; } 如何写一个模拟器，让你测试userAdder过程调用你的mocked函数？ 这是我的尝试，但它失败，并显示测试失败的消息：Caught null对象没有方法'call' 。 class MyMock extends Mock { MyMock b $ b when（callsTo（'call'））。alwaysCall（this.foo）; } int foo（int a，int b）=> a + b; } void main（）{ test（bb，（）{ var mockf = new MyMock b expect（useAdder（mockf.call），3）; mockf.getLogs（callsTo（'call'，1,2））。verify（happensOnce）; } } 如果我更改 expect（useAdder（mockf.call），3） 到 expect（useAdder（mockf.foo），3）; 方法调用不会出现在日志中解决方案我的尝试 import' unittest / unittest.dart'; import'package：mock / mock.dart'; typedef int Adder（int a，int b）; int useAdder（加法器）{返回加法器（1,2）; } 类MyMock扩展Mock { MyMock（）{ when（callsTo（'call'））。alwaysCall（this.foo）; } int foo（int a，int b）=> a + b; int call（int a，int b）=> super.call（a，b）; } void main（）{ test（bb，（）{ var mockf = new MyMock ; expect（useAdder（mockf as Adder），3）; mockf.getLogs（callsTo（'call'，1,2））。verify（happenedOnce）; } } 似乎调用方法实际上存在使MyMock被接受为Adder 。 How do I go about mocking a procedure (as apposed to a function see here)For example, given the following typedef and procedure, typedef int Adder(int a, int b);int useAdder(Adder adder) { return adder(1, 2);}How could you write a mock that would allow you to test that the userAdder procedure called you mocked function?This was my attempt, but it fails with the message that test failed: Caught The null object does not have a method 'call'.class MyMock extends Mock { MyMock(){ when(callsTo('call')).alwaysCall(this.foo); } int foo(int a, int b) => a+b;}void main() { test("bb", () { var mockf = new MyMock(); expect(useAdder( mockf.call), 3); mockf.getLogs(callsTo('call', 1, 2)).verify(happenedOnce); });}If I change expect(useAdder( mockf.call), 3);to expect(useAdder( mockf.foo), 3);the method call does not appear in the log 解决方案 My attemptimport 'package:unittest/unittest.dart';import 'package:mock/mock.dart';typedef int Adder(int a, int b);int useAdder(Adder adder) { return adder(1, 2);}class MyMock extends Mock { MyMock(){ when(callsTo('call')).alwaysCall(this.foo); } int foo(int a, int b) => a+b; int call(int a, int b) => super.call(a, b);}void main() { test("bb", () { var mockf = new MyMock(); expect(useAdder(mockf as Adder), 3); mockf.getLogs(callsTo('call', 1, 2)).verify(happenedOnce); });}It seems the call method has to actually exist to make MyMock being accepted as Adder. 这篇关于Dart如何模拟程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！
