Test-Driven Java Development, Second Edition - Second Edition

Requirement 2 – adding two-player support

Now it's time to work on the specification of which player is about to play his turn.

There should be a way to find out which player should play next.

We can split this requirement into three tests:

• The first turn should be played by player X
• If the last turn was played by X, then the next turn should be played by O
• If the last turn was played by O, then the next turn should be played by X

Until this moment, we haven't used any of the JUnit's asserts. To use them, we need to import the static methods from the org.junit.Assert class:

import static org.junit.Assert.*;

In their essence, methods inside the Assert class are very simple. Most of them start with assert. For example, assertEquals compares ...