单元测试实体框架验证 [英] Unit Testing Entity Framework Validation

问题描述

我已经为使用IValidatableObject的一些Entity Framework对象编写了一些自定义验证，并且已经添加了一些DataAnnotations给对象进行验证。

我想测试验证是满足所需的验证（确保自定义验证工作，所做的任何更改都保留了这些数据注释等），但是我无法确定如何在单元测试中运行验证，而不调用SaveChanges（我不想做一个事情，如果有一个问题，验证不会工作，它会写入数据源）

我想做这样的事情：

  [TestMethod] 
 public void InvalidStartDate_StartDateAfterEndDate（）
 {
 var header = new Header（）
 {
 StartDate = DateTime.Now.AddDays（15），
 EndDate = DateTime.Now.AddDays（-15）
}; 
 var actual = header.IsValid（）; 
 var expected = false; 
 Assert.AreEqual（expected，actual）; 
} 
  

或类似于

  [TestMethod] 
 public void InvalidStartDate_StartDateAfterEndDate（）
 {
 var header = new Header（）
 {
 StartDate = DateTime.Now.AddDays（15），
 EndDate = DateTime.Now.AddDays（-15）
}; 
 var actual = header.GetValidationErrors（）。Count; 
 var expected = 0; 
 Assert.AreEqual（expected，actual）; 
} 
  

但似乎找不到一种让验证运行没有调用保存更改，是否有办法？

解决方案

您可以调用验证器验证该对象。

  [TestMethod] 
 public void InvalidStartDate_StartDateAfterEndDate（）
 {
 var header = new Header（）
 {
 StartDate = DateTime .Now.AddDays（15），
 EndDate = DateTime.Now.AddDays（-15）
}; 
 
 var context = new ValidationContext（header，null，null）; 
 var results = new List< ValidationResult>（）; 
 
 var actual = Validator.TryValidateObject（header，context，results）; 
 var expected = false; 
 
 Assert.AreEqual（expected，actual）; 
} 
  

I have written some custom validation for some Entity Framework objects using IValidatableObject and I have added some DataAnnotations to the objects for validation.

I wanted to test that validation is meeting the required validation (ensuring that the custom validation is working and that any changes made keep those Data Annotations etc...) but I can't determine how to run the validation in the unit test without calling SaveChanges (which I don't want to do as if there is an issue and validation doesn't work it would write to the data source)

I wanted to do something like this:

[TestMethod]
public void InvalidStartDate_StartDateAfterEndDate()
{
   var header = new Header()
                    {
                        StartDate = DateTime.Now.AddDays(15),
                        EndDate = DateTime.Now.AddDays(-15)
                    };
   var actual = header.IsValid();
   var expected = false;
   Assert.AreEqual(expected, actual);
}

Or something like

[TestMethod]
public void InvalidStartDate_StartDateAfterEndDate()
{
   var header = new Header()
                    {
                        StartDate = DateTime.Now.AddDays(15),
                        EndDate = DateTime.Now.AddDays(-15)
                    };
   var actual = header.GetValidationErrors().Count;
   var expected = 0;
   Assert.AreEqual(expected, actual);
}

But can't seem to find a way of getting the validation to run without calling save changes, is there a way to do this?

解决方案

You can invoke the Validator to validate the object.

[TestMethod]
public void InvalidStartDate_StartDateAfterEndDate()
{
   var header = new Header()
                    {
                        StartDate = DateTime.Now.AddDays(15),
                        EndDate = DateTime.Now.AddDays(-15)
                    };

   var context = new ValidationContext(header, null, null);
   var results = new List<ValidationResult>();

   var actual = Validator.TryValidateObject(header, context, results);
   var expected = false;

   Assert.AreEqual(expected, actual);
}

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