We already saw that a test fixture is a class decorated with the
TestFixture attribute and tests are public methods decorated with the
Even by most conservative estimations, test fixture classes tend to be multiple times bigger than the tested component. For this reason, it's better to structure the test fixtures to increase readibility.
Following the common C# coding style, a test fixture should be structured as follow
test fixture constructor
test fixture set up methods
tests targeting constructors of the system under test
tests targeting methods of the system under tests, grouped by method
tests targeting properties of the system under tests, grouped by properties
test fixture tear-down methods
Additionally, local helper methods should be placed next to the method using it. If a helper method is shared by multiple tests, it should be placed at the end of the class.