What does an attr_accessor mean?
Most of the above answers use code. There is no point me repeating what they say, so I’ll try to explain the concept without code:
What is duck typing?
What is a test stub?
‘What is meant by implementing an interface?’
What is meant by implementing an interface?
What is an external dependency?
What is an external dependency?
What is the difference between a unit and integration test? Consequences of using dependencies in your unit tests.
What is a class under test?
What is a class under test?
What is the difference between the ExpectedException() attribute and Assert.Throws()?
With Assert.Throws() you can be really specific. You can say: an exception will be thrown at this method.
What is the difference between IQueryable and IEnumerable?
Difference Between IEnumerable and IQueryable
Short cut to format your code in Visual Studio
I’ve had occasion where I’m cutting and pasting code and it comes out in a nightmarish form in Visual Studio: