重载 equalsCode 方法；添加单元测试

src/test/java/xyz/zhouxy/plusone/commons/base/IWithIntCodeTests.java

@@ -0,0 +1,38 @@
+package xyz.zhouxy.plusone.commons.base;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class IWithIntCodeTests {
+    @Test
+    void test() {
+        IWithIntCode instance1 = new WithIntCodeImpl(10);
+        IWithIntCode instance2 = new WithIntCodeImpl(20);
+        IWithIntCode instance3 = new WithIntCodeImpl(10);
+
+        // Test for equalsCode method
+        assertTrue(instance1.equalsCode(10));
+        assertFalse(instance1.equalsCode(20));
+        assertTrue(instance2.equalsCode(20));
+        assertTrue(instance3.equalsCode(10));
+
+        // Test for distinct instances with same code
+        assertTrue(instance1.equalsCode(instance3.getCode())); // because they have the same code
+        assertFalse(instance1.equalsCode(instance2.getCode())); // because they have different codes
+    }
+}
+
+class WithIntCodeImpl implements IWithIntCode {
+    private int code;
+
+    public WithIntCodeImpl(int code) {
+        this.code = code;
+    }
+
+    @Override
+    public int getCode() {
+        return code;
+    }
+}