Fix Checkstyle

proxy/src/main/java/com/velocitypowered/proxy/util/VelocityChannelRegistrar.java

@@ -57,6 +57,11 @@ public class VelocityChannelRegistrar implements ChannelRegistrar {
     }
   }
 
+  /**
+   * Returns all legacy channel IDs.
+   *
+   * @return all legacy channel IDs
+   */
   public Collection<String> getLegacyChannelIds() {
     Collection<String> ids = new HashSet<>();
     for (ChannelIdentifier value : identifierMap.values()) {

proxy/src/test/java/com/velocitypowered/proxy/protocol/util/PluginMessageUtilTest.java

@@ -1,6 +1,6 @@
 package com.velocitypowered.proxy.protocol.util;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import org.junit.jupiter.api.Test;
 

proxy/src/test/java/com/velocitypowered/proxy/util/VelocityChannelRegistrarTest.java

@@ -1,6 +1,6 @@
 package com.velocitypowered.proxy.util;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import com.google.common.collect.ImmutableSet;
 import com.velocitypowered.api.proxy.messages.LegacyChannelIdentifier;
@@ -28,8 +28,10 @@ class VelocityChannelRegistrarTest {
 
     // Two channels cover the modern channel (velocity:test) and the legacy-mapped channel
     // (legacy:velocitytest). Make sure they're what we expect.
-    assertEquals(ImmutableSet.of(MODERN.getId(), SIMPLE_LEGACY_REMAPPED), registrar.getModernChannelIds());
+    assertEquals(ImmutableSet.of(MODERN.getId(), SIMPLE_LEGACY_REMAPPED), registrar
-    assertEquals(ImmutableSet.of(SIMPLE_LEGACY.getId(), MODERN.getId()), registrar.getLegacyChannelIds());
+        .getModernChannelIds());
+    assertEquals(ImmutableSet.of(SIMPLE_LEGACY.getId(), MODERN.getId()), registrar
+        .getLegacyChannelIds());
   }
 
   @Test