Refactor util for setting BukkitService mock behavior

- Move helper methods for setting BukkitService mock behavior into their own class
- Change methods to use Mockito's answer instead of verification + argument capture -> calling the methods now belongs to the test setup (given clause) and allows the behavior to take effect more than once

src/test/java/fr/xephi/authme/data/TempbanManagerTest.java

@@ -20,6 +20,7 @@ import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
 
+import static fr.xephi.authme.service.BukkitServiceTestHelper.setBukkitServiceToScheduleSyncDelayedTask;
 import static org.hamcrest.Matchers.contains;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.lessThan;
@@ -151,10 +152,10 @@ public class TempbanManagerTest {
         given(messages.retrieveSingle(MessageKey.TEMPBAN_MAX_LOGINS)).willReturn(banReason);
         Settings settings = mockSettings(2, 100, "");
         TempbanManager manager = new TempbanManager(bukkitService, messages, settings);
+        setBukkitServiceToScheduleSyncDelayedTask(bukkitService);
 
         // when
         manager.tempbanPlayer(player);
-        TestHelper.runSyncDelayedTask(bukkitService);
 
         // then
         verify(player).kickPlayer(banReason);
@@ -178,10 +179,10 @@ public class TempbanManagerTest {
         String banCommand = "banip %ip% 15d IP ban too many logins";
         Settings settings = mockSettings(2, 100, banCommand);
         TempbanManager manager = new TempbanManager(bukkitService, messages, settings);
+        setBukkitServiceToScheduleSyncDelayedTask(bukkitService);
 
         // when
         manager.tempbanPlayer(player);
-        TestHelper.runSyncDelayedTask(bukkitService);
 
         // then
         verify(bukkitService).dispatchConsoleCommand(banCommand.replace("%ip%", ip));
@@ -200,10 +201,10 @@ public class TempbanManagerTest {
         manager.increaseCount(ip, "user");
         manager.increaseCount(ip, "name2");
         manager.increaseCount(ip, "user");
+        setBukkitServiceToScheduleSyncDelayedTask(bukkitService);
 
         // when
         manager.tempbanPlayer(player);
-        TestHelper.runSyncDelayedTask(bukkitService);
 
         // then
         verify(player).kickPlayer(banReason);