验证在函数调用中传递的方法是否正确
本文关键字:方法 是否 函数调用 验证 | 更新日期: 2023-09-27 18:25:22
我的测试类在其构造函数中有两个对象,一个是数据加载器,另一个是使用从数据加载器返回的数据的类。
数据加载器接口有两个函数,LoadCompanies()和LoadEmployees(),这两个函数都接受int参数并返回IEnumerable。
如何验证测试中的方法是否将LoadCompanies()和NOT LoadEmployees()传递到数据使用者类中?
这是我的代码:
[TestFixture]
public class TestingFunctionalParameters_UT
{
[Test]
public void Correct_Loader_Method_is_Used()
{
const int userId = 1;
var companies = new[] { "c1", "c2" };
var dataLoader = MockRepository.GenerateMock<ITestDataLoader>();
var dataConsumer = MockRepository.GenerateMock<IDataConsumerClass>();
var testObject = new TestClass(dataLoader, dataConsumer);
dataConsumer.Expect(fc => fc.LoadIt(Arg<Func<IEnumerable<string>>>.Is.TypeOf)).Return(true);
//TODO: validate that correct dataloader function was called...
//dataLoader.Expect(dl => dl.LoadCompanies(userId)).Return(companies);
var result = testObject.Run(userId);
Assert.That(result, Is.True);
dataLoader.VerifyAllExpectations();
dataConsumer.VerifyAllExpectations();
}
}
public class TestClass
{
private readonly ITestDataLoader dataLoader;
private readonly IDataConsumerClass funcClass;
public TestClass(ITestDataLoader dataLoader, IDataConsumerClass funcClass)
{
this.dataLoader = dataLoader;
this.funcClass = funcClass;
}
public bool Run(int userId)
{
Func<IEnumerable<string>> loadFn = () => dataLoader.LoadCompanies(userId);
return funcClass.LoadIt(loadFn);
}
}
public interface ITestDataLoader
{
IEnumerable<string> LoadCompanies(int userId);
IEnumerable<string> LoadEmployees(int userId);
}
public interface IDataConsumerClass
{
bool LoadIt(Func<IEnumerable<string>> load);
}
您可以创建公司和员工类
class Company
{
public Company(string name)
{
Name = name;
}
public string Name { get; private set; }
public override string ToString()
{
return Name;
}
}
对员工做同样的事情,然后像这个一样定义你的界面
public interface ITestDataLoader
{
IEnumerable<Company> LoadCompanies(int userId);
IEnumerable<Employee> LoadEmployees(int userId);
}
现在,公司和员工不能再被混淆了。
编辑:
如果你有很多这样的情况,你可以创建一个通用的基类
class NamedItem
{
public NamedItem(string name)
{
Name = name;
}
public string Name { get; private set; }
public override string ToString()
{
return Name;
}
}
class Company : NamedItem
{
public Company(string name)
: base(name)
{
}
}
class Employee : NamedItem
{
public Employee (string name)
: base(name)
{
}
}
(编辑:我假设您的示例是一个简化的示例,而您的实际实现是尝试测试委托注入模式)
也许你可以这样写你的测试?(编辑为实际编译)
[Test]
public void Correct_Loader_Method_is_Used()
{
const int userId = 1;
var companies = new[] { "c1", "c2" };
var dataLoader = MockRepository.GenerateMock<ITestDataLoader>();
var dataConsumer = MockRepository.GenerateMock<IDataConsumerClass>();
var testObject = new TestClass(dataLoader, dataConsumer);
dataConsumer.Expect(fc => fc.LoadIt(Arg<Func<IEnumerable<string>>>.Matches(x => x().Any()))).Return(true);
//validate that correct dataloader function was called...
dataLoader.Expect(dl => dl.LoadCompanies(userId)).Return(companies);
// Fails if you uncomment this line
//dataLoader.Expect(dl => dl.LoadEmployees(userId)).Return(companies);
var result = testObject.Run(userId);
Assert.That(result, Is.True);
dataLoader.VerifyAllExpectations();
dataConsumer.VerifyAllExpectations();
}
基本上,Matches()约束将尝试执行该方法,如果它尝试调用LoadEmployees(),RhinoMocks将抱怨,因为它没有定义mock。
更新:处理Action<T>
代表
这可能不那么健壮,但对于Action<T>
s:
public interface IDataConsumerClass
{
bool LoadIt(Func<IEnumerable<string>> load);
bool ExecuteIt<T>(Action<T> execute);
}
//...
dataConsumer.Expect(fc => fc.ExecuteIt(Arg<Action<int>>.Matches(x => ActionWrapper(x, userId)))).Return(true);
//...
private bool ActionWrapper<T>(Action<T> action, T arg)
{
action(arg);
return true;
}