Add some tests, minor Checkstyle fixes

src/main/java/fr/xephi/authme/command/CommandUtils.java

@@ -5,7 +5,6 @@ import org.bukkit.ChatColor;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.stream.Collectors;
 
 /**
  * Utility functions for {@link CommandDescription} objects.
@@ -76,19 +75,14 @@ public final class CommandUtils {
     }
 
     /**
-     * Returns a textual representation of the command, including its arguments.
-     * For example: {@code /authme purge <days> [includeZero]}.
+     * Constructs a command path with color formatting, based on the supplied labels. This includes
+     * the command's arguments, as defined in the provided command description. The list of labels
+     * must contain all labels to be used.
      *
-     * @param command the command to create a usage string for
-     * @return the command's path and arguments
+     * @param command the command to read arguments from
+     * @param correctLabels the labels to use (must be complete)
+     * @return formatted command syntax incl. arguments
      */
-    public static String buildSyntax(CommandDescription command) {
-        String arguments = command.getArguments().stream()
-            .map(arg -> formatArgument(arg))
-            .collect(Collectors.joining(" "));
-        return (constructCommandPath(command) + " " + arguments).trim();
-    }
-
     public static String buildSyntax(CommandDescription command, List<String> correctLabels) {
         String commandSyntax = ChatColor.WHITE + "/" + correctLabels.get(0) + ChatColor.YELLOW;
         for (int i = 1; i < correctLabels.size(); ++i) {
@@ -106,7 +100,7 @@ public final class CommandUtils {
      * @param argument the argument to format
      * @return the formatted argument
      */
-    private static String formatArgument(CommandArgumentDescription argument) {
+    public static String formatArgument(CommandArgumentDescription argument) {
         if (argument.isOptional()) {
             return "[" + argument.getName() + "]";
         }

src/main/java/fr/xephi/authme/task/purge/PurgeExecutor.java

@@ -169,7 +169,6 @@ public class PurgeExecutor {
             return;
         }
 
-        int i = 0;
         File essentialsDataFolder = pluginHookService.getEssentialsDataFolder();
         if (essentialsDataFolder == null) {
             ConsoleLogger.info("Cannot purge Essentials: plugin is not loaded");
@@ -181,14 +180,15 @@ public class PurgeExecutor {
             return;
         }
 
+        int deletedFiles = 0;
         for (OfflinePlayer offlinePlayer : cleared) {
             File playerFile = new File(userDataFolder, PlayerUtils.getUuidOrName(offlinePlayer) + ".yml");
             if (playerFile.exists() && playerFile.delete()) {
-                i++;
+                deletedFiles++;
             }
         }
 
-        ConsoleLogger.info("AutoPurge: Removed " + i + " EssentialsFiles");
+        ConsoleLogger.info("AutoPurge: Removed " + deletedFiles + " EssentialsFiles");
     }
 
     // TODO #676: What is this method for? Is it correct?

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

@@ -61,7 +61,7 @@ public final class FileUtils {
             ConsoleLogger.warning("Could not create directory '" + dir + "'");
             return false;
         }
-        return true;
+        return dir.isDirectory();
     }
 
     /**

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

@@ -5,11 +5,11 @@ import java.util.regex.Pattern;
 /**
  * Utility class about the InternetProtocol
  */
-public class InternetProtocolUtils {
+public final class InternetProtocolUtils {
 
-    private final static Pattern LOCAL_ADDRESS_PATTERN =
-        Pattern.compile("(^127\\.)|(^(0)?10\\.)|(^172\\.(0)?1[6-9]\\.)|(^172\\.(0)?2[0-9]\\.)" +
-            "|(^172\\.(0)?3[0-1]\\.)|(^169\\.254\\.)|(^192\\.168\\.)");
+    private static final Pattern LOCAL_ADDRESS_PATTERN =
+        Pattern.compile("(^127\\.)|(^(0)?10\\.)|(^172\\.(0)?1[6-9]\\.)|(^172\\.(0)?2[0-9]\\.)"
+            + "|(^172\\.(0)?3[0-1]\\.)|(^169\\.254\\.)|(^192\\.168\\.)");
 
     // Utility class
     private InternetProtocolUtils() {