3 A’s Pattern For Writing Test Methods
Arrange, Act, Assert. Specifically, use separate code paragraphs (groups of lines of code separated by a blank line) for each of the As. Arrange is variable declaration and initialization. Act is invoking the code under test. Assert is using the Assert.* methods to verify that expectations were met. Following this pattern consistently makes it easy to revisit test code.
[source: Principles for Test-Driven Development]
