Online Unit Testing, Batch Unit Testing

32.5.6.1 Online Unit Testing

Prior to this task, an online test plan, and possibly detailed test scripts, have been developed with and presented to the test team, together with organizational instructions, during a pre-test orientation session.

CICS testing is an ideal place to begin the testing process. At least in theory, CICS transactions are fairly transparent between OS/390 and VSE/ESA. Assuming that the migration environment has been set up per the instructions in Chapter 25, ªPrepare the Migration Environmentº on page401 in this book, CICS is the first area to be scheduled for testing and can occur very early in the project.

The online unit testing results that are sought during this early testing are:

∙

Get a screen to come up Travel within the screen Query a customer record

The testing continues with thorough sample unit testing of 30 to 50

representative transactions. The idea is to use limited resources (small test team and DASD) to verify that the conversion specifications and the automated conversion process generate sound OS/390 application material (programs, screens and files), which execute without ending abnormally. Results and file updates are verified. The conversion specifications and automated conversion process usually need some adjustment before full-size resource-consuming functional testing can start.

32.5.6.2 Batch Unit Testing

Prior to this task, a batch test plan has been developed with and presented to the test team, together with organizational instructions, during a pre-test orientation session.

Batch application tests start with sample unit testing of 30 to 50 representative daily jobs. The idea is to use limited resources (small test team and DASD) to verify that the conversion specifications and the automated conversion process generate sound OS/390 application material (JCL, code and files), which execute without JCL error, abends or abnormal return codes. Report contents and file updates are not verified at this stage. The conversion specifications and automated conversion process usually need some adjustment before full-size resource-consuming functional testing can start.

32.5.6.3 Data Migration in Unit Testing

The topic of data migration is implied throughout all the phases of testing. In unit testing transferring a couple of tapes of CICS data sets to MVS is sufficient for testing. By the time you are performing test switchover dress rehearsals you are copying data so that it matches exactly on both systems. In this way, data migration and the testing phases are synchronized events. Discussions on data migration will be included in each of the testing sections.

32.5.6.4 Timing between Online and Batch Testing

Normally online unit testing will be completed early in the project. From a project perspective, the focus frequently remains on the online workload and the system testing phase of on-ine is started right after the unit testing ends. This is because it is frequently too early in the project to begin batch unit testing. The batch testing is more complicated than online due to the JCL conversion. This is

512VSE to OS/390 Migration Workbook

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.

IBM OS/390 manual Online Unit Testing, Batch Unit Testing, Data Migration in Unit Testing

Models: OS/390