Finally, the It block, describes your testable pieces of code. Each It block should assert one statement, and will return Pass or Fail by default. Optionally, you can elect to skip certain tests, or mark tests as inconclusive when they are too generic. By adding a Because statement to your It block, you can further elaborate on why tests fail when they should not. This is especially interesting when writing integration tests, but is extremely useful in unit testing as well: