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package au.id.zancanaro.javacheck.state.queue.commands;
import au.id.zancanaro.javacheck.state.Command;
import au.id.zancanaro.javacheck.state.queue.QueueState;
import static org.junit.Assert.assertEquals;
public class Peek<T> extends Command<QueueState<T>, Void, T> {
@Override
public boolean preCondition(QueueState<T> state, Void args) {
return state != null && !state.getAbstractQueue().isEmpty();
}
@Override
public T runCommand(QueueState<T> state, Void args) {
return state.getConcreteQueue().peek();
}
@Override
public void postCondition(QueueState<T> oldState, QueueState<T> newState, Void args, T result) {
assertEquals(oldState.getAbstractQueue().get(0), result);
}
}
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