fix mojang status endpoint

src/main/java/xyz/mcutils/backend/common/AppConfig.java

@@ -22,7 +22,7 @@ public final class AppConfig {
     private static boolean isRunningTest = true;
     static {
         try {
-            Class.forName("org.junit.Test");
+            Class.forName("org.junit.jupiter.engine.JupiterTestEngine");
         } catch (ClassNotFoundException e) {
             isRunningTest = false;
         }

src/main/java/xyz/mcutils/backend/common/MojangServer.java

@@ -0,0 +1,85 @@
+package xyz.mcutils.backend.common;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.ToString;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+@AllArgsConstructor
+@Getter
+@ToString
+public enum MojangServer {
+    SESSION("Session Server", "https://sessionserver.mojang.com"),
+    API("Mojang API", "https://api.mojang.com"),
+    TEXTURES("Textures Server", "https://textures.minecraft.net"),
+    ASSETS("Assets Server", "https://assets.mojang.com"),
+    LIBRARIES("Libraries Server", "https://libraries.minecraft.net"),
+    SERVICES("Minecraft Services", "https://api.minecraftservices.com");
+
+    private static final long STATUS_TIMEOUT = TimeUnit.SECONDS.toMillis(4);
+
+    /**
+     * The name of this server.
+     */
+    @NonNull private final String name;
+
+    /**
+     * The endpoint of this service.
+     */
+    @NonNull private final String endpoint;
+
+    /**
+     * Ping this service and get the status of it.
+     *
+     * @return the service status
+     */
+    @NonNull
+    public Status getStatus() {
+        try {
+            InetAddress address = InetAddress.getByName(endpoint.substring(8));
+            long before = System.currentTimeMillis();
+            if (address.isReachable((int) STATUS_TIMEOUT)) {
+                // The time it took to reach the host is 75% of
+                // the timeout, consider it to be degraded.
+                if ((System.currentTimeMillis() - before) > STATUS_TIMEOUT * 0.75D) {
+                    return Status.DEGRADED;
+                }
+                return Status.ONLINE;
+            }
+        } catch (UnknownHostException ex) {
+            ex.printStackTrace();
+        } catch (IOException ignored) {
+            // We can safely ignore any errors, we're simply checking
+            // if the host is reachable, if it's not, it's offline.
+        }
+        return Status.OFFLINE;
+    }
+
+    /**
+     * The status of a service.
+     */
+    public enum Status {
+        /**
+         * The service is online and accessible.
+         */
+        ONLINE,
+
+        /**
+         * The service is online, but is experiencing degraded performance.
+         */
+        DEGRADED,
+
+        /**
+         * The service is offline and inaccessible.
+         */
+        OFFLINE
+    }
+}