SAP CDS view单元测试框架Test Double介绍

Stella981
• 阅读 638

系列目录

There is a wonderful blog Introduction to CDS Test Double Framework – How to write unit tests for ABAP CDS Entities? written by Sunil Bandameedapalli.

For me, the CDS view test double framework works as a magic for me: how the mocked data I inserted into the view under test could be read again in unit test code? As a result in this blog I will try to explain how CDS view framework works under the hood.

The view I am developed is listed below, which is simply used to return material guid with description by joining table MAKT with MARA:

@AbapCatalog.sqlViewName: 'PRODSHTEXT'
@VDM.viewType: #BASIC
@AccessControl.authorizationCheck: #NOT_REQUIRED
@ClientHandling.algorithm: #SESSION_VARIABLE
@EndUserText.label: 'Product Description'
define view ProductShortText
  as select from makt
    inner join   mara on makt.matnr = mara.matnr
{
  key mara.scm_matid_guid16 as ProductGuid,
  key makt.spras            as Language,
      makt.maktx            as ProductName,
      makt.maktg            as ProductNameLarge
}

Create a new class and you do not need to create any method within this class.

SAP CDS view单元测试框架Test Double介绍

Activate the class and perform unit test, you should see the information message that unit test is successfully executed.

SAP CDS view单元测试框架Test Double介绍

Now let’s see how the whole scenario works.

Step1 – Test environment creation

This is done in CLASS_SETUP method:
cl_cds_test_environment=>create( i_for_entity =’PRODUCTSHORTTEXT’ ).

From the CASE-WHEN statement below we can know that the CDS test framework still supports various Database other than HANA.

SAP CDS view单元测试框架Test Double介绍

Step2 – CDS view source code parse

The framework should know which database tables are used in the CDS view under test, since the mock data is inserted to database table level, not CDS view level.

The source code parse is done via a Visitor pattern and result stored in r_result, which contains two table, MARA and MAKT of course.

If you would like to know how this Visitor pattern works in detail, please refer to my blog Visitor pattern used in CDS View Test double framework.

SAP CDS view单元测试框架Test Double介绍
SAP CDS view单元测试框架Test Double介绍
SAP CDS view单元测试框架Test Double介绍

Step3 – Created transient tables based on parsed database table

Since the test double framework knows from step2 that MARA and MAKT are involved in the CDS view under test, so now it is able to create transient tables based on both. The created tables are dummy, which is used to hold test data inserted in the unit test, and those dummy tables will be destroyed when the test environment is destroyed, I would like to call them as shadow table.

SAP CDS view单元测试框架Test Double介绍
SAP CDS view单元测试框架Test Double介绍

Step4 – unit test developers insert test data to shadow table

Unit test developers now prepare test data, wrap it by calling cl_cds_test_data=>create, and insert the wrapped test data into shadow table via API insert provided by test double framework.

SAP CDS view单元测试框架Test Double介绍

In next step when the CDS view under test is queried in unit test code, the inserted data prepared in this step will be serving as response.

Step5 – OPEN SQL redirected to shadow table

When the CDS view is queried, the read operation will be actually redirected to shadow table created in step 3.

SAP CDS view单元测试框架Test Double介绍

And how CDS test double framework knows which shadow table should be redirected for MARA and which for MAKT?
Actually in step3, when shadow table are created, the relationship between original table and created shadow table are maintained in an internal table:

SAP CDS view单元测试框架Test Double介绍
SAP CDS view单元测试框架Test Double介绍

Based on this metadata, the real redirection is switched on by a Kernel implementation:

SAP CDS view单元测试框架Test Double介绍
SAP CDS view单元测试框架Test Double介绍

Update on 2017-04-25 15:39PM

I remove the explanation on how the kernel module mentioned above is implemented as my ABAP colleague tells me it should not be published to the public.

要获取更多Jerry的原创文章,请关注公众号"汪子熙":
SAP CDS view单元测试框架Test Double介绍

本文分享 CSDN - 汪子熙。
如有侵权,请联系 support@oschina.cn 删除。
本文参与“OSC源创计划”,欢迎正在阅读的你也加入,一起分享。

点赞
收藏
评论区
推荐文章
blmius blmius
3年前
MySQL:[Err] 1292 - Incorrect datetime value: ‘0000-00-00 00:00:00‘ for column ‘CREATE_TIME‘ at row 1
文章目录问题用navicat导入数据时,报错:原因这是因为当前的MySQL不支持datetime为0的情况。解决修改sql\mode:sql\mode:SQLMode定义了MySQL应支持的SQL语法、数据校验等,这样可以更容易地在不同的环境中使用MySQL。全局s
Easter79 Easter79
3年前
swap空间的增减方法
(1)增大swap空间去激活swap交换区:swapoff v /dev/vg00/lvswap扩展交换lv:lvextend L 10G /dev/vg00/lvswap重新生成swap交换区:mkswap /dev/vg00/lvswap激活新生成的交换区:swapon v /dev/vg00/lvswap
皕杰报表之UUID
​在我们用皕杰报表工具设计填报报表时,如何在新增行里自动增加id呢?能新增整数排序id吗?目前可以在新增行里自动增加id,但只能用uuid函数增加UUID编码,不能新增整数排序id。uuid函数说明:获取一个UUID,可以在填报表中用来创建数据ID语法:uuid()或uuid(sep)参数说明:sep布尔值,生成的uuid中是否包含分隔符'',缺省为
待兔 待兔
3个月前
手写Java HashMap源码
HashMap的使用教程HashMap的使用教程HashMap的使用教程HashMap的使用教程HashMap的使用教程22
Jacquelyn38 Jacquelyn38
3年前
2020年前端实用代码段,为你的工作保驾护航
有空的时候,自己总结了几个代码段,在开发中也经常使用,谢谢。1、使用解构获取json数据let jsonData  id: 1,status: "OK",data: 'a', 'b';let  id, status, data: number   jsonData;console.log(id, status, number )
Wesley13 Wesley13
3年前
Java获得今日零时零分零秒的时间(Date型)
publicDatezeroTime()throwsParseException{    DatetimenewDate();    SimpleDateFormatsimpnewSimpleDateFormat("yyyyMMdd00:00:00");    SimpleDateFormatsimp2newS
Wesley13 Wesley13
3年前
mysql设置时区
mysql设置时区mysql\_query("SETtime\_zone'8:00'")ordie('时区设置失败,请联系管理员!');中国在东8区所以加8方法二:selectcount(user\_id)asdevice,CONVERT\_TZ(FROM\_UNIXTIME(reg\_time),'08:00','0
Wesley13 Wesley13
3年前
00:Java简单了解
浅谈Java之概述Java是SUN(StanfordUniversityNetwork),斯坦福大学网络公司)1995年推出的一门高级编程语言。Java是一种面向Internet的编程语言。随着Java技术在web方面的不断成熟,已经成为Web应用程序的首选开发语言。Java是简单易学,完全面向对象,安全可靠,与平台无关的编程语言。
Stella981 Stella981
3年前
Django中Admin中的一些参数配置
设置在列表中显示的字段,id为django模型默认的主键list_display('id','name','sex','profession','email','qq','phone','status','create_time')设置在列表可编辑字段list_editable
Wesley13 Wesley13
3年前
MySQL部分从库上面因为大量的临时表tmp_table造成慢查询
背景描述Time:20190124T00:08:14.70572408:00User@Host:@Id:Schema:sentrymetaLast_errno:0Killed:0Query_time:0.315758Lock_
Python进阶者 Python进阶者
9个月前
Excel中这日期老是出来00:00:00,怎么用Pandas把这个去除
大家好,我是皮皮。一、前言前几天在Python白银交流群【上海新年人】问了一个Pandas数据筛选的问题。问题如下:这日期老是出来00:00:00,怎么把这个去除。二、实现过程后来【论草莓如何成为冻干莓】给了一个思路和代码如下:pd.toexcel之前把这