add unit test

+package com.yohoufo.order.service;
+
+import com.yohoufo.order.BaseTest;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Created by chao.chen on 2019/1/22.
+ */
+public class RuntimeExceptionTest extends BaseTest{
+    private Logger logger = LoggerFactory.getLogger(getClass());
+
+    @Test
+    public void testPrintStack(){
+        try{
+            throw new RuntimeException("test RuntimeException");
+        }catch (Exception ex){
+            logger.warn("in testPrintStack occur error", ex);
+        }
+        doAfterOccurError();
+    }
+
+    private void doAfterOccurError(){
+        System.out.println("always i thought code can reach here");
+    }
+}