Fix UtilsTest and replace the last test setups not to use reflections

src/main/java/fr/xephi/authme/command/executable/logout/LogoutCommand.java

@@ -3,6 +3,7 @@ package fr.xephi.authme.command.executable.logout;
 import fr.xephi.authme.AuthMe;
 import fr.xephi.authme.command.CommandParts;
 import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.util.Wrapper;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
@@ -18,7 +19,7 @@ public class LogoutCommand extends ExecutableCommand {
         }
 
         // Get the player instance
-        final AuthMe plugin = AuthMe.getInstance();
+        final AuthMe plugin = Wrapper.getInstance().getAuthMe();
         final Player player = (Player) sender;
 
         // Logout the player

src/main/java/fr/xephi/authme/util/Utils.java

@@ -53,18 +53,22 @@ public final class Utils {
      */
     public static boolean setGroup(Player player, GroupType group) {
         // Check whether the permissions check is enabled
-        if (!Settings.isPermissionCheckEnabled)
+        if (!Settings.isPermissionCheckEnabled) {
             return false;
+        }
 
         // Get the permissions manager, and make sure it's valid
         PermissionsManager permsMan = plugin.getPermissionsManager();
-        if (permsMan == null)
+        if (permsMan == null) {
             ConsoleLogger.showError("Failed to access permissions manager instance, shutting down.");
-        assert permsMan != null;
+            return false;
+        }
 
         // Make sure group support is available
-        if (!permsMan.hasGroupSupport())
+        if (!permsMan.hasGroupSupport()) {
             ConsoleLogger.showError("The current permissions system doesn't have group support, unable to set group!");
+            return false;
+        }
 
         switch (group) {
             case UNREGISTERED:

src/test/java/fr/xephi/authme/command/executable/logout/LogoutCommandTest.java

@@ -1,10 +1,10 @@
 package fr.xephi.authme.command.executable.logout;
 
 import fr.xephi.authme.AuthMe;
-import fr.xephi.authme.AuthMeMockUtil;
 import fr.xephi.authme.command.CommandParts;
 import fr.xephi.authme.process.Management;
 import fr.xephi.authme.settings.Settings;
+import fr.xephi.authme.util.WrapperMock;
 import org.bukkit.command.BlockCommandSender;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
@@ -12,6 +12,8 @@ import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mockito;
 
+import java.io.File;
+
 import static org.mockito.Matchers.any;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
@@ -25,8 +27,9 @@ public class LogoutCommandTest {
 
     @Before
     public void initializeAuthMeMock() {
-        AuthMeMockUtil.mockAuthMeInstance();
-        AuthMe pluginMock = AuthMe.getInstance();
+        WrapperMock wrapper = WrapperMock.createInstance();
+        wrapper.setDataFolder(new File("/"));
+        AuthMe pluginMock = wrapper.getAuthMe();
 
         Settings.captchaLength = 10;
         managementMock = mock(Management.class);

src/test/java/fr/xephi/authme/util/UtilsTest.java

@@ -8,10 +8,12 @@ import fr.xephi.authme.settings.Settings;
 import org.bukkit.GameMode;
 import org.bukkit.entity.Player;
 import org.junit.Before;
+import org.junit.BeforeClass;
 import org.junit.Ignore;
 import org.junit.Test;
 import org.mockito.Mockito;
 
+import java.io.File;
 import java.lang.reflect.Field;
 import java.util.Collection;
 import java.util.logging.Logger;
@@ -25,18 +27,33 @@ import static org.mockito.Mockito.*;
 /**
  * Test for the {@link Utils} class.
  */
-@Ignore
-// TODO ljacqu 20151126: Fix tests
 public class UtilsTest {
 
-    private AuthMe authMeMock;
+    private static WrapperMock wrapperMock;
+    private static AuthMe authMeMock;
     private PermissionsManager permissionsManagerMock;
 
+    /**
+     * The Utils class initializes its fields in a {@code static} block which is only executed once during the JUnit
+     * tests, too. It is therefore important to initialize the mocks once with {@code @BeforeClass}. Initializing with
+     * {@code @Before} as we usually do will create mocks that won't have any use in the Utils class.
+     */
+    @BeforeClass
+    public static void setUpMocks() {
+        wrapperMock = WrapperMock.createInstance();
+        wrapperMock.setDataFolder(new File("/"));
+        authMeMock = wrapperMock.getAuthMe();
+    }
+
     @Before
-    public void setUpMocks() {
-        WrapperMock w = WrapperMock.getInstance();
-        authMeMock = w.getAuthMe();
-        permissionsManagerMock = Mockito.mock(PermissionsManager.class);
+    public void setIndirectMocks() {
+        // Since the mocks aren't set up for each test case it is important to reset them when verifying whether or not
+        // they have been called. We want to return null for permissions manager once so we initialize a mock for it
+        // before every test -- this is OK because it is retrieved via authMeMock. It is just crucial that authMeMock
+        // remain the same object.
+        reset(authMeMock);
+
+        permissionsManagerMock = mock(PermissionsManager.class);
         when(authMeMock.getPermissionsManager()).thenReturn(permissionsManagerMock);
     }
 
@@ -89,7 +106,6 @@ public class UtilsTest {
         Settings.isPermissionCheckEnabled = true;
         given(authMeMock.getPermissionsManager()).willReturn(null);
         Player player = mock(Player.class);
-        AuthMeMockUtil.mockSingletonForClass(ConsoleLogger.class, "wrapper", Wrapper.getInstance());
 
         // when
         boolean result = Utils.addNormal(player, "test_group");
@@ -128,6 +144,7 @@ public class UtilsTest {
     }
 
     // Note: This method is used through reflections
+    @SuppressWarnings("unused")
     public static Player[] onlinePlayersImpl() {
         return new Player[]{
             mock(Player.class), mock(Player.class)