[英]mstest how do I create test methods that work on the same object (cumulatively)?
我目前正在尝试对要构建的计算器进行测试(使用复合模式)。第一种方法应添加$ 75,这可以正常工作,但是当第二种方法运行时,“ service”将重置,并且有$ 0作为工作成本。 如果我将这两种方法合而为一,那么一切都会按照我的预期进行。 如何在服务领域保留价值?
[TestClass()]
public class JobTests
{
private Service service;
private LaborTime laborTime;
private LaborRates laborRates;
[TestInitialize]
public void init()
{
service = new EmergencyService();
}
[TestMethod()]
// add one hour of service at $75/50 rate
public void Job_OnFullCost_Is75()
{
// Arrange
laborTime = new LaborTime(
checkIn: new DateTime(year: 2016, month: 7, day: 20, hour: 10, minute: 0, second: 0),
checkOut: new DateTime(year: 2016, month: 7, day: 20, hour: 11, minute: 0, second: 0)
);
laborRates = new LaborRates(75, 50);
service = new Labor(service, laborTime, laborRates);
// Act
var expected = 75.0M;
var actual = service.JobCost;
// Assert
Assert.AreEqual(expected, actual);
}
[TestMethod()]
// add another hour to the service, at same rate of $175/60
public void Job_OnFullCost_Is125()
{
// Arrange
laborTime = new LaborTime(
checkIn: new DateTime(year: 2016, month: 7, day: 20, hour: 12, minute: 0, second: 0),
checkOut: new DateTime(year: 2016, month: 7, day: 20, hour: 13, minute: 0, second: 0)
);
LaborRates laborRates = new LaborRates(75, 50);
service = new Labor(service, laborTime, laborRates);
//service.IsContinuation = true;
// Act
var expected = 125.0M;
var actual = service.JobCost;
// Assert
Assert.AreEqual(expected, actual);
}
}
由于不能保证所有单元测试可以一起运行或以特定顺序运行,因此最佳实践是避免在它们之间添加时间依赖性 (即要求它们以特定顺序运行才能正常工作)。
取而代之的是,将增加劳动的“困难部分”提取到单独的辅助方法中,并使两种方法测试特定的方案。
[TestClass()]
public class JobTests
{
private Service service;
[TestInitialize]
public void init()
{
service = new EmergencyService();
}
[TestMethod()]
// add one hour of service at $75/50 rate
public void Job_OnFullCost_Is75()
{
// Arrange
AddHourOfService(75, 50);
// Act
var expected = 75.0M;
var actual = service.JobCost;
// Assert
Assert.AreEqual(expected, actual);
}
[TestMethod()]
// add another hour to the service, at same rate of $175/60
public void Job_OnFullCost_Is125()
{
// Arrange
AddHourOfService(75, 50);
AddHourOfService(75, 50);
// Act
var expected = 125.0M;
var actual = service.JobCost;
// Assert
Assert.AreEqual(expected, actual);
}
private void AddHourOfService(int cost, int time)
{
var laborTime = new LaborTime(
checkIn: new DateTime(year: 2016, month: 7, day: 20, hour: 10, minute: 0, second: 0),
checkOut: new DateTime(year: 2016, month: 7, day: 20, hour: 11, minute: 0, second: 0)
);
var laborRates = new LaborRates(75, 50);
service = new Labor(service, laborTime, laborRates);
}
}
除了消除测试之间的时间耦合之外,这还具有使代码的目的显而易见的良好副作用。 您不再需要诸如“以$ AddHourOfService(75, 50)
价格增加一小时的服务”之类的AddHourOfService(75, 50)
因为AddHourOfService(75, 50)
使得事情很明显。 以这种方式让代码自行记录是好的,因为注释很容易与代码不同步(如第二条注释中所示,“ $ 175/60”显然不是测试的目的,您可以看到)。
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