diff --git a/src/main/java/xyz/ineanto/nicko/appearance/random/RandomNameFetcher.java b/src/main/java/xyz/ineanto/nicko/appearance/random/RandomNameFetcher.java
index 0557047..b6778a4 100644
--- a/src/main/java/xyz/ineanto/nicko/appearance/random/RandomNameFetcher.java
+++ b/src/main/java/xyz/ineanto/nicko/appearance/random/RandomNameFetcher.java
@@ -24,13 +24,13 @@ public class RandomNameFetcher {
         try (BufferedReader reader = new BufferedReader(new InputStreamReader(resource))) {
             String line;
             while ((line = reader.readLine()) != null) {
-                String[] values = line.split("\n");
+                final String[] values = line.split("\n");
                 records.add(Arrays.asList(values));
             }
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
 
-        return records.get(new Random().nextInt(records.size() -1)).get(0);
+        return records.get(new Random().nextInt(records.size() - 1)).get(0);
     }
 }
diff --git a/src/test/java/xyz/ineanto/nicko/test/appearance/RandomNameTest.java b/src/test/java/xyz/ineanto/nicko/test/appearance/RandomNameTest.java
index c5486b6..008dcca 100644
--- a/src/test/java/xyz/ineanto/nicko/test/appearance/RandomNameTest.java
+++ b/src/test/java/xyz/ineanto/nicko/test/appearance/RandomNameTest.java
@@ -8,8 +8,9 @@ import org.junit.jupiter.api.Test;
 import xyz.ineanto.nicko.NickoBukkit;
 import xyz.ineanto.nicko.appearance.random.RandomNameFetcher;
 import xyz.ineanto.nicko.config.Configuration;
+import xyz.ineanto.nicko.mojang.MojangUtils;
 
-import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.*;
 
 public class RandomNameTest {
     private static NickoBukkit plugin;
@@ -25,7 +26,9 @@ public class RandomNameTest {
     @DisplayName("Get random name")
     public void getRandomName() {
         final RandomNameFetcher randomNameFetcher = new RandomNameFetcher(plugin);
-        assertNotNull(randomNameFetcher.getRandomUsername());
+        final String username = randomNameFetcher.getRandomUsername();
+        assertNotNull(username);
+        assertFalse(MojangUtils.isUsernameInvalid(username));
     }
 
     @AfterAll