IBM Systems Magazine, Mainframe - March/April 2017 - 48


TECH SHOWCASE

code being tested with a particular set of inputs. It compares
actual versus expected outputs
of that code, which passes when
they match. The automated test
principles are simple, but at
scale, things get more complex.
It's not unusual for an application to have thousands of these
tests, covering as many execution
scenarios as possible.
Automated testing frameworks built on the xUnit
architecture address the issue
of scale, arranging test cases-
which check outputs using
assertions (i.e., statements
that compare actual outputs
to expected outputs)-into a
hierarchy of test suites, and
running the tests with a test
runner (i.e., a program that

knows how to run tests and format the results in
a consistent way). Test frameworks built on the
xUnit are usually named for the environment in
which they're intended to run, such as the JUnit
for tests intended for Java* programs. In the
z Systems environment the zUnit framework and
tooling can generate and run tests for COBOL and
PL/I programs.
Running automated tests in a z Systems environment has particular challenges. Businesses don't
want to risk the sensitive data or performance of
their production environments, or consume more
MIPS than necessary by running too many automated tests. These challenges are addressed using
two strategies: virtualization and optimization.
Teams use virtualization tools to protect z Systems
assets during automated testing. If a team wants to
protect its database from accidental contamination
during automated testing, it can use a virtualization
tool that stubs SQL invocations. Then the program
can be run without actually touching the database.
Likewise, if a team wants to protect a CICS* region,

it can use a virtualization tool
that stubs CICS statement calls.
Some unit testing tools will run
an LPAR on a workstation for test
purposes. While this small-scale
environment can't hold up to production workloads and shouldn't
be used for performance testing,
it may be suitable for automated
functional testing. In general,
virtualization can be used at these
various levels to protect assets for
risk, performance or cost reasons.
When a team builds a large
suite of automated test cases,
the costs of running the suite
of tests on a frequent basis can
mount quickly in terms of both
time and processing costs. Teams
must find a balance between the
number of tests run and the cost
associated with running them.

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48 // MARCH/APRIL 2017 ibmsystemsmag.com

pg 45-49.indd 6

2/7/17 1:57 PM


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Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - March/April 2017

Table of Contents
Editor's Desk: Ahead of the Times
Techbits: Cognitive Customer Engagement
Partner PoV: Keep Data Out of Danger: Use the right tools to implement your large-object strategy
Currents: A Layered Approach: Using microservices on z Systems with CICS improves flexibility and reliability
IT Today: Choosing the Right Cloud: What to consider when using a managed service provider
R&D: Move Along: IBM Research and partners help traffic run smoothly in Madrid
Trends: How to Improve Your Sales Skills: Tips for techies on showing the value of their services
Feature: Strength in Collaboration: Linux on z Systems accelerates new and traditional workloads
Feature: Community Computing: The Open Mainframe Project expands educational opportunities for Linux on z Systems users
TECH Showcase: Shift-Left Testing Improves Success: Automated testing in the DevOps cycle improves quality and reduces risk
Tech Corner: Database Development: IBM DB2 V12 enhances and integrates data for cloud, mobile and analytics
Solutions: SMART TS XL V8.0, IN-COM Data Systems; Tubes, Macro 4; CleverView for TCP/IP on Linux V2.5, AES
Stop Run: A Global View: Computer science and astrophysics prove a natural fit
Reference Point - Global Events, Education, Resources for Mainframe
2017 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - March/April 2017 - Intro
IBM Systems Magazine, Mainframe - March/April 2017 - Cover1
IBM Systems Magazine, Mainframe - March/April 2017 - Cover2
IBM Systems Magazine, Mainframe - March/April 2017 - 1
IBM Systems Magazine, Mainframe - March/April 2017 - Table of Contents
IBM Systems Magazine, Mainframe - March/April 2017 - 3
IBM Systems Magazine, Mainframe - March/April 2017 - 4
IBM Systems Magazine, Mainframe - March/April 2017 - 5
IBM Systems Magazine, Mainframe - March/April 2017 - Editor's Desk: Ahead of the Times
IBM Systems Magazine, Mainframe - March/April 2017 - 7
IBM Systems Magazine, Mainframe - March/April 2017 - Techbits: Cognitive Customer Engagement
IBM Systems Magazine, Mainframe - March/April 2017 - 9
IBM Systems Magazine, Mainframe - March/April 2017 - 10
IBM Systems Magazine, Mainframe - March/April 2017 - 11
IBM Systems Magazine, Mainframe - March/April 2017 - Partner PoV: Keep Data Out of Danger: Use the right tools to implement your large-object strategy
IBM Systems Magazine, Mainframe - March/April 2017 - 13
IBM Systems Magazine, Mainframe - March/April 2017 - Currents: A Layered Approach: Using microservices on z Systems with CICS improves flexibility and reliability
IBM Systems Magazine, Mainframe - March/April 2017 - 15
IBM Systems Magazine, Mainframe - March/April 2017 - 16
IBM Systems Magazine, Mainframe - March/April 2017 - 17
IBM Systems Magazine, Mainframe - March/April 2017 - IT Today: Choosing the Right Cloud: What to consider when using a managed service provider
IBM Systems Magazine, Mainframe - March/April 2017 - 19
IBM Systems Magazine, Mainframe - March/April 2017 - 20
IBM Systems Magazine, Mainframe - March/April 2017 - 21
IBM Systems Magazine, Mainframe - March/April 2017 - R&D: Move Along: IBM Research and partners help traffic run smoothly in Madrid
IBM Systems Magazine, Mainframe - March/April 2017 - 23
IBM Systems Magazine, Mainframe - March/April 2017 - Trends: How to Improve Your Sales Skills: Tips for techies on showing the value of their services
IBM Systems Magazine, Mainframe - March/April 2017 - 25
IBM Systems Magazine, Mainframe - March/April 2017 - 26
IBM Systems Magazine, Mainframe - March/April 2017 - 27
IBM Systems Magazine, Mainframe - March/April 2017 - Feature: Strength in Collaboration: Linux on z Systems accelerates new and traditional workloads
IBM Systems Magazine, Mainframe - March/April 2017 - 29
IBM Systems Magazine, Mainframe - March/April 2017 - 30
IBM Systems Magazine, Mainframe - March/April 2017 - 31
IBM Systems Magazine, Mainframe - March/April 2017 - 32
IBM Systems Magazine, Mainframe - March/April 2017 - 33
IBM Systems Magazine, Mainframe - March/April 2017 - Feature: Community Computing: The Open Mainframe Project expands educational opportunities for Linux on z Systems users
IBM Systems Magazine, Mainframe - March/April 2017 - 35
IBM Systems Magazine, Mainframe - March/April 2017 - 36
IBM Systems Magazine, Mainframe - March/April 2017 - 37
IBM Systems Magazine, Mainframe - March/April 2017 - 38
IBM Systems Magazine, Mainframe - March/April 2017 - 39
IBM Systems Magazine, Mainframe - March/April 2017 - 40
IBM Systems Magazine, Mainframe - March/April 2017 - 41
IBM Systems Magazine, Mainframe - March/April 2017 - 42
IBM Systems Magazine, Mainframe - March/April 2017 - 43
IBM Systems Magazine, Mainframe - March/April 2017 - 44
IBM Systems Magazine, Mainframe - March/April 2017 - TECH Showcase: Shift-Left Testing Improves Success: Automated testing in the DevOps cycle improves quality and reduces risk
IBM Systems Magazine, Mainframe - March/April 2017 - 46
IBM Systems Magazine, Mainframe - March/April 2017 - 47
IBM Systems Magazine, Mainframe - March/April 2017 - 48
IBM Systems Magazine, Mainframe - March/April 2017 - 49
IBM Systems Magazine, Mainframe - March/April 2017 - Tech Corner: Database Development: IBM DB2 V12 enhances and integrates data for cloud, mobile and analytics
IBM Systems Magazine, Mainframe - March/April 2017 - 51
IBM Systems Magazine, Mainframe - March/April 2017 - 52
IBM Systems Magazine, Mainframe - March/April 2017 - 53
IBM Systems Magazine, Mainframe - March/April 2017 - 54
IBM Systems Magazine, Mainframe - March/April 2017 - Solutions: SMART TS XL V8.0, IN-COM Data Systems; Tubes, Macro 4; CleverView for TCP/IP on Linux V2.5, AES
IBM Systems Magazine, Mainframe - March/April 2017 - Stop Run: A Global View: Computer science and astrophysics prove a natural fit
IBM Systems Magazine, Mainframe - March/April 2017 - Cover3
IBM Systems Magazine, Mainframe - March/April 2017 - Cover4
IBM Systems Magazine, Mainframe - March/April 2017 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - March/April 2017 - 2017 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - March/April 2017 - SE2
IBM Systems Magazine, Mainframe - March/April 2017 - SE3
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