Question

This is a very vague (and noob) question, but…..How would one approach testing a class library in C#? I am using nUnit for testing.

What I am trying to do is test database interaction. The input will be a serialized XML object, deserialize it to test it against the code, then the XML object will be re-serialized and outputted.

Hopefully, this gives some insight. I had thought about creating a test app that creates an instance of the library. Is there a different/better/more efficient approach I can take?

Answer 1

You have to create a separate project that uses NUnit’s data annotations (TestFixture, Test, etc). Then you can build that project and load the created DLL into Nunit.

As far as the tests, just write them as you would normally (Arrange-Act-Assert is the more prevalent pattern)

Something like this

[Test]
public void MethodName_CallDatabase_ObjectDeserialized()
{
    //Arrange
    var db = new db();
    //Act 
    var output = db.ExecuteCall();
    //Assert
    Assert.That(output, Is.EqualTo("123"));
}