EasyMock unexpected method call

I can't work out how to setup the expectation of a call to a mock class. Here is the JUnit test:

public class AfkTest extends TestCase {
private AfkPlayerManager manager;
private Player player;
private Set<AfkPlayer> afkPlayers;


public void setUp() throws Exception {
    super.setUp();

    manager = new AfkPlayerManager();
    player = EasyMock.createMock(Player.class);
    afkPlayers = new HashSet<AfkPlayer>();
}

public void tearDown() {
}

public void testNotifyOfAfkPlayerSuccess() {
    AfkPlayer afkPlayer = new AfkPlayer();
    afkPlayer.setPlayer(player);
    afkPlayer.setReason("TEST REASON");
    afkPlayers.add(afkPlayer);

    List<Player> onlinePlayers = new ArrayList<Player>();
    onlinePlayers.add(player);
    onlinePlayers.add(player);

    EasyMock.expect(player.getDisplayName()).andReturn("TEST PLAYER");

    player.sendMessage("§9TEST PLAYER§b is AFK. [TEST REASON]");
    EasyMock.expectLastCall().times(1);

    //activate the mock
    EasyMock.replay(player);    

    assertTrue(manager.notifyOfAfkPlayer(onlinePlayers, afkPlayer));

    //verify call to sendMessage is made or not
    EasyMock.verify(player);
}

}

And the method that I am testing:

   public class AfkPlayerManager implements Manager {

    public boolean notifyOfAfkPlayer(Collection<Player> onlinePlayers, AfkPlayer afkPlayer) {

        if (afkPlayer == null) {

            return false;
        }

        String message = ChatColor.BLUE + afkPlayer.getPlayer().getDisplayName();
        message += ChatColor.AQUA + " is AFK.";

        if (afkPlayer.getReason().length() > 0) {

            message += " [" + afkPlayer.getReason() + "]";
        }


        if (onlinePlayers != null && onlinePlayers.size() > 1) {

            int notified = 0;

            for (Player onlinePlayer : onlinePlayers) {

                onlinePlayer.sendMessage(message);
                notified++;
            }

            if (notified > 0) {

                return true;
            }
        }

        return false;
    }
}

Why is this giving me the AssertionError:

java.lang.AssertionError: Unexpected method call Player.sendMessage("§9TEST PLAYER§b is AFK. [TEST REASON]"): Player.sendMessage("§9TEST PLAYER§b is AFK. [TEST REASON]"): expected: 1, actual: 0 at org.easymock.internal.MockInvocationHandler.invoke(MockInvocationHandler.java:44) at org.easymock.internal.ObjectMethodsFilter.invoke(ObjectMethodsFilter.java:94) at com.sun.proxy.$Proxy3.sendMessage(Unknown Source) at crm.afk.AfkPlayerManager.notifyOfAfkPlayer(AfkPlayerManager.java:33) at crm.test.AfkTest.testNotifyOfAfkPlayerSuccess(AfkTest.java:84) 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 junit.framework.TestCase.runTest(TestCase.java:176) at junit.framework.TestCase.runBare(TestCase.java:141) at junit.framework.TestResult$1.protect(TestResult.java:122) at junit.framework.TestResult.runProtected(TestResult.java:142) at junit.framework.TestResult.run(TestResult.java:125) at junit.framework.TestCase.run(TestCase.java:129) at junit.framework.TestSuite.runTest(TestSuite.java:252) at junit.framework.TestSuite.run(TestSuite.java:247) at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:86) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)