如何获取MSTest测试用例的错误消息.我已经浏览并找到了以下代码，但字段被分配了空值

Question

public static string GetErrorMessageFromTestContext(TestContext testContext)
{
const BindingFlags privateGetterFlags = System.Reflection.BindingFlags.GetField |
System.Reflection.BindingFlags.GetProperty |
System.Reflection.BindingFlags.NonPublic |
System.Reflection.BindingFlags.Instance |
System.Reflection.BindingFlags.FlattenHierarchy;
var m_message = string.Empty; // Returns empty if TestOutcome is not failed
if (testContext.CurrentTestOutcome == UnitTestOutcome.Failed)
{
// Get hold of TestContext.m_currentResult.m_errorInfo.m_message (contains the exception text that was thrown)
var field = testContext.GetType().GetField("m_currentResult", privateGetterFlags);}

Answer 1

如何覆盖TestMethodAttribute：

public class MyTestMethodAttribute : TestMethodAttribute
{
public override TestResult[] Execute(ITestMethod testMethod)
{
TestResult[] testResults = base.Execute(testMethod);
foreach (TestResult item in testResults.Where(x => x.Outcome == UnitTestOutcome.Failed))
{
// "Assert.AreEqual failed. Expected:<1>. Actual:<2>."
string errorMessage = item.TestFailureException?.Message;
}
return testResults;
}
}
[TestClass]
public class MyClassTest
{
[MyTestMethod]
public void MyTestMethod()
{
Assert.AreEqual(1, 2);
}
}