Boa tarde!

Ao executar meu teste "LanceSystemTeste" foi exibido a seguinte mensagem de erro:

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.rangeCheck(Unknown Source)
    at java.util.ArrayList.get(Unknown Source)
    at br.com.caelum.teste.LeiloesPage.detalhes(LeiloesPage.java:37)
    at br.com.caelum.teste.LanceSystemTest.deveFazerUmLance(LanceSystemTest.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

apareceu no eclipse como se o erro estivesse no deveFazerUmLance.

package br.com.caelum.teste;

import static org.junit.Assert.assertTrue;

import org.junit.Before; import org.junit.Test; import org.openqa.selenium.firefox.FirefoxDriver;

public class LanceSystemTest {

private FirefoxDriver driver;
private LeiloesPage leiloes;

@Before    
public void inicializa() {

    driver = new FirefoxDriver();
    leiloes = new LeiloesPage(driver);

    driver.get("http://localhost:8080/apenas-teste/limpa");

    UsuariosPage usuarios = new UsuariosPage(driver);
    usuarios.visita();
    usuarios.novo().cadastra("Jessica Rodrigues", "jessica@teste.com");

    LeiloesPage leiloes = new LeiloesPage(driver);
    leiloes.visita();
    leiloes.novo().preenche("Mesa", 150, "Jessica Rodrigues", false);


}

@Test 
public void deveFazerUmLance() {

    DetalhesDoLeilaoPage lances = leiloes.detalhes(1);

    lances.lance("Jessica Rodrigues", 150);

    assertTrue(lances.existeLance("Jessica Rodrigues", 150));

}

}

Código com implementação DetalhesDoLeilaoPage

package br.com.caelum.teste;

import java.util.List;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

public class LeiloesPage {

    private WebDriver driver;

    public LeiloesPage(WebDriver driver) {
        this.driver = driver;
    }

    public void visita() {
        driver.get("http://localhost:8080/leiloes");
    }

    public NovoLeilaoPage novo() {
        driver.findElement(By.linkText("Novo Leilão")).click();

        return new NovoLeilaoPage(driver);
    }

    public boolean existe (String produto, double valor, String usuario, boolean usado) {

        return driver.getPageSource().contains(produto) &&
               driver.getPageSource().contains(String.valueOf(valor)) &&
               driver.getPageSource().contains(usado ? "Sim":"Não");    
    }

    public DetalhesDoLeilaoPage detalhes(int posicao) {

        List<WebElement> elementos = driver.findElements(By.linkText("exibir"));
        elementos.get(posicao -1).click();

        return new DetalhesDoLeilaoPage(driver);
    }

}