实现首页默认显示前一天之后所有要提交的作业，修改部分不合法的命名格式

src/test/java/com/fjy/spring/service/HomeworkServiceTest.java

@@ -0,0 +1,49 @@
+package com.fjy.spring.service;
+
+import com.fjy.spring.domain.VHomework;
+import org.junit.Test;
+
+import java.text.Format;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class HomeworkServiceTest {
+
+    @Test
+    public void findAll() {
+    }
+
+    @Test
+    public void findAllVHomework() {
+    }
+
+    @Test
+    public void findById() {
+        Format f = new SimpleDateFormat("yyyy-MM-dd");
+
+        Date today = new Date();
+        System.out.println("今天是:" + f.format(today));
+
+        Calendar c = Calendar.getInstance();
+        c.setTime(today);
+        c.add(Calendar.DAY_OF_MONTH, -1);// 今天+1天
+
+        Date tomorrow = c.getTime();
+        System.out.println("昨天是:" + f.format(tomorrow));
+    }
+
+    @Test
+    public void findAllVHomeworkAfterTime() {
+        HomeworkService homeworkService = new HomeworkService();
+        List<VHomework> homeworkList = homeworkService.findAllVHomeworkAfterTime("2018-05-28");
+        if (homeworkList!=null){
+            for (VHomework vHomework : homeworkList){
+                System.out.println(vHomework.toString());
+            }
+        }
+    }
+}