diff --git a/ConfigTest.java b/ConfigTest.java
new file mode 100644
index 0000000..4b328a9
--- /dev/null
+++ b/ConfigTest.java
@@ -0,0 +1,53 @@
+/**
+ * Test class for Config builder pattern implementation
+ */
+public class ConfigTest {
+
+    /**
+     * Main method to run tests
+     * @param args Command line arguments
+     */
+    public static void main(String[] args){
+        // Test 1: Using default parameters
+        System.out.println("Test 1: Using default parameters");
+        Config config1 = new Config.ConfigBuilder("http://example.com")
+                .build();
+        System.out.println("URL: " + config1.getUrl());
+        System.out.println("Encoding: " + config1.getEncoding());
+        System.out.println("Max Connections: " + config1.getMaxConnections());
+        System.out.println("Timeout: " + config1.getTimeout());
+        System.out.println();
+        
+        // Test 2: Customizing all optional parameters
+        System.out.println("Test 2: Customizing all optional parameters");
+        Config config2 = new Config.ConfigBuilder("http://test.com")
+                .setEncoding("GBK")
+                .setMaxConnections(50)
+                .setTimeout(5000)
+                .build();
+        System.out.println("URL: " + config2.getUrl());
+        System.out.println("Encoding: " + config2.getEncoding());
+        System.out.println("Max Connections: " + config2.getMaxConnections());
+        System.out.println("Timeout: " + config2.getTimeout());
+        System.out.println();
+        
+        // Test 3: Validating parameter checks
+        System.out.println("Test 3: Parameter validation");
+        try {
+            new Config.ConfigBuilder("")
+                    .build();
+            System.out.println("Failed: Empty URL should be rejected");
+        } catch (IllegalArgumentException e) {
+            System.out.println("Success: Empty URL rejected - " + e.getMessage());
+        }
+        
+        try {
+            new Config.ConfigBuilder("http://example.com")
+                    .setMaxConnections(-1)
+                    .build();
+            System.out.println("Failed: Negative max connections should be rejected");
+        } catch (IllegalArgumentException e) {
+            System.out.println("Success: Negative max connections rejected - " + e.getMessage());
+        }
+    }
+}
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