The result, or assertion (the expected result), is exactly what it sounds like. If you expect that the method being tested will return a 3, then you write an assertion that validates that expectation. The Single Assert Rule states that there should be only one assertion made per test. This does not mean that you can only assert once; instead, it means that your assertions should only confirm one logical expectation. As a quick example, you might have a method that returns a list of items after applying a filter. After setting up the test context, calling the method will result in a list of only one item, and that item will match the filter that we have defined. In this case, you will have a programmatic assert for the count of items in the list and one programmatic assert for the filter criterion we are testing.