#1350 Add option to force using the sync PlayerLoginEvent

- Introduce new configuration (taken from @sgdc3)
- Create JoiningPlayer, based on a Player object or String name, determining how permissions will be checked

src/test/java/fr/xephi/authme/permission/PermissionsManagerTest.java

@@ -1,5 +1,6 @@
 package fr.xephi.authme.permission;
 
+import fr.xephi.authme.listener.JoiningPlayer;
 import org.bukkit.Server;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
@@ -12,8 +13,13 @@ import org.mockito.junit.MockitoJUnitRunner;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assert.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
 
 /**
  * Test for {@link PermissionsManager}.
@@ -148,4 +154,26 @@ public class PermissionsManagerTest {
         // then
         assertThat(result, equalTo(true));
     }
+
+    @Test
+    public void shouldHandleJoiningPlayerPermissionChecksWithProperMethod() {
+        // given
+        Player player = mock(Player.class);
+        JoiningPlayer fromPlayer = JoiningPlayer.fromPlayerObject(player);
+        JoiningPlayer fromName = JoiningPlayer.fromName("Chris");
+
+        PermissionsManager permManagerSpy = spy(permissionsManager);
+        given(permManagerSpy.hasPermission(any(Player.class), eq(PlayerPermission.LOGIN))).willReturn(true);
+        given(permManagerSpy.hasPermissionOffline(anyString(), eq(PlayerPermission.UNREGISTER))).willReturn(true);
+
+        // when
+        boolean resultFromPlayer = permManagerSpy.hasPermission(fromPlayer, PlayerPermission.LOGIN);
+        boolean resultFromName = permManagerSpy.hasPermission(fromName, PlayerPermission.UNREGISTER);
+
+        // then
+        assertThat(resultFromPlayer, equalTo(true));
+        assertThat(resultFromName, equalTo(true));
+        verify(permManagerSpy).hasPermission(player, PlayerPermission.LOGIN);
+        verify(permManagerSpy).hasPermissionOffline(fromName.getName(), PlayerPermission.UNREGISTER);
+    }
 }