fix code and add test

hutool-db/src/test/java/cn/hutool/db/ds/DataSourceWrapperTest.java

@@ -0,0 +1,18 @@
+package cn.hutool.db.ds;
+
+import cn.hutool.db.ds.simple.SimpleDataSource;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class DataSourceWrapperTest {
+
+	@Test
+	public void cloneTest(){
+		final SimpleDataSource simpleDataSource = new SimpleDataSource("jdbc:sqlite:test.db", "", "");
+		final DataSourceWrapper wrapper = new DataSourceWrapper(simpleDataSource, "test.driver");
+
+		final DataSourceWrapper clone = wrapper.clone();
+		Assert.assertEquals("test.driver", clone.getDriver());
+		Assert.assertEquals(simpleDataSource, clone.getRaw());
+	}
+}