Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to verify an exception that has been thrown in unit testing C#?
There are two ways that we can verify an exception in unit testing.
- Using Assert.ThrowsException
- Using ExpectedException Attribute.
Example
Let us consider a StringAppend method which throws an exception needs to be tested.
using System;
namespace DemoApplication {
public class Program {
static void Main(string[] args) {
}
public string StringAppend(string firstName, string lastName) {
throw new Exception("Test Exception");
}
}
}Using Assert.ThrowsException
using System;
using DemoApplication;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace DemoUnitTest {
[TestClass]
public class DemoUnitTest {
[TestMethod]
public void DemoMethod() {
Program program = new Program();
var ex = Assert.ThrowsException<Exception>(() => program.StringAppend("Michael","Jackson"));
Assert.AreSame(ex.Message, "Test Exception");
}
}
}example, we are calling the StringAppend method using Assert.ThrowsException and exception type and message are validated. So the test case will pass.
Using ExpectedException Attribute
using System;
using DemoApplication;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace DemoUnitTest {
[TestClass]
public class DemoUnitTest {
[TestMethod]
[ExpectedException(typeof(Exception), "Test Exception")]
public void DemoMethod() {
Program program = new Program();
program.StringAppend("Michael", "Jackson");
}
}
}example, we are using ExpectedException attribute and specifying the type of the expected exception. Since the StringAppend method throw the same type of exception which is mentioned in [ExpectedException(typeof(Exception), "Test Exception")] the test case will pass.
Updated on: 08-Aug-2020
3K+ Views
Advertisements