What is Regression Testing?

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blog.eviltester.com/2017/10/what‐is‐regression‐testing‐
software.html

What is Regression Testing?
Alan Richardson
www.eviltester.com/agile
www.compendiumdev.co.uk
@eviltester
blog.eviltester.c...

TLDR; Regression Testing is a Legacy
term for testing when a risk of
unexpected impact exists after making
changes.
@EvilT...

What is Regression?
a former or less developed state.
a more primitive state.
@EvilTester 4

What is regression testing?
A system might regress to a former or less
developed state. A more primitive state.
Regression...

Why would we do regression testing?
Because the change might have had an
unexpected impact on another part of the system.
...

When do we do regression testing?
Q: When do we do regression testing?
A: Pretty much whenever we make a change.
We make a...

_Just to be clear, "A Change". Any kind of
change.
Code, infrastructure, environment, libraries,
browsers that users use, ...

How do we do regression testing?
The legacy view of how we do regression testing is:
"Well. We've already tested it. So wh...

Essentially what we're talking about is a
subset of testing in an area that is not
directly related to the area we've
chan...

How did this concept arise?
Waterfall
Too many changes to test in a short period of time
Control changes
Re‐run rather tha...

The problem with Regression Testing?
The system does not actually regress.
The system does not move to a former state or a...

Testing can be viewed as being "all"
about risk
When we use the term Regression Testing. We're obscuring the risk.
We're j...

Redefine Regression Testing in terms of
risk
"there's a risk that a change has had an
unexpected impact on another part of...

How else could we mitigate the risk of
unexpected change?
We don't have to use testing as our only mitigation strategy:
ch...

Any time we're faced with uncertainty.
The only thing that really deals with
uncertainty, is a new set of analysis. A
new ...

Exploratory testing does that by default
comes up with new ideas,
looks at the risks,
looks at the system,
figures out how...

Redefine your terminology, so that
you're not just relying on old legacy
notions of "I'll just rerun my stuff again".
@Evi...

Look at risk, and adapt your process: your test process, your testing
ideas and approach, to the actual needs that are in ...

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BIO ‐ Alan Richardson
Alan Richardson has more than twenty years of professional IT
experience, working as a programmer an...

Alan Richardson ﴾www﴿
www.compendiumdev.co.uk
www.eviltester.com
www.seleniumsimplified.com
www.javafortesters.com
uk.link...

Follow
Linkedin ‐ uk.linkedin.com/in/eviltester
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