A practical take on Exploratory/Session Based Testing

General Overview and Definition:

As companies look for more cost effective and agile testing methods Exploratory (or Ad Hoc testing) is coming to the fore. I like James Bach’s definition best: ‘Exploratory testing is essentially simultaneous learning, test design and test execution.’ The approach relies on your instinct as a tester and requires a high level view of the functionality.

However, planning an exploratory testing session is key. Planning should be high level and based on the key aspects of the functionality and your testing toolset.

Planning - A Practical Example:

A Software Development House needs to release a piece of functionality to a client. The client insists that it is tested by the end of the day, bugs notwithstanding.

This gives you, the tester, and one working day to test it. For the example this is 6 hours of test time, with half an hour for planning, and a further hour to tidy up and ask questions/raise defects.

The functionality is available for test and has passed initial deployment checks.

The piece of functionality regards creating an online account with an e-Commerce site has 7 requirements, split over three functional areas. This document assumes you have one or the other!

It is recommended that you add a priority and a size to each requirement or functional area. The priority may or may not be provided but you can apply your own common sense to the issue:

Functional Area	Requirement	Priority	Size
Account Details	User can add a Username	High	Medium
	User can set a Password	High	Large
	User can set Address Details	Medium	Medium
	User can add a Nickname	Low	Small
Add Payment Methods	User can add a Credit Card payment method	High	Large
	User can add an e-Wallet payment method	Medium	Large
Post Account Creation	User is logged in after creating an Account	High	Small

The key is the priority and the size; we can use this to work out a strategy for allocating time. This is done subjectively:

Requirement	Priority	Size	Percentage of TimeAllocated	Time Allocated in Hours
User can add a Username	High	Medium	15	1
User can set a Password	High	Large	25	1.5
User can add a Credit Card payment method	High	Large	25	1.5
User is logged in after creating an Account	High	Small	10	0.6
User can set Address Details	Medium	Medium	10	0.6
User can add an e-Wallet payment method	Medium	Large	10	0.6
User can add a Nickname	Low	Small	5	0.3

You now have a high level plan which communicates the priority order of testing and how much time this will take. Communicate this to the stakeholders (development team, project team etc) and you are ready to get started.

Exploratory Testing – Executing the Plan:

So we have decided our plan and testing can begin.

The first requirement is ‘User can add a Username.’ There is an hour allocated for this.

Obviously all the requirements for Account Details are linked (you may not be able to submit an Account Creation Request without some of the other items but our focus for the session is on the username. ‘Stub’ out the other fields with values you think should work.

Structure as follows:

User Interface – How is the UI presented? Is there any validation? Any help prompts? Can I interrogate the CSS,JavaScript, and Flash (if web based)?

Middleware – How does my username get to the DB? Is it a messaging system? Web service? Does it validate on its way through?

Database/Storage – Where/what is the DB? What are primary keys? Does my username need to unique? How do the database rules translate to the UI?

As you generate and execute these high level test ideas, note a sentence that describes what you have tested (try in a text file it easily communicable and you don’t need to rewrite them afterwards). Note any defects/questions which occur under the Test Idea. Do this incrementally as they occur, rather than storing them up.

Leave yourself sometime at the end to communicate your coverage of each requirement outwards, clarify any questions,and decide which of your potential defects need to be logged.

Resources:

Basic Definition

http://en.wikipedia.org/wiki/Exploratory_testing

Key Aspects of Exploratory Testing

http://www.satisfice.com/articles/et-article.pdf

Exploratory vs Experience Based Testing

http://www.satisfice.com/blog/archives/664

Testing without a Map – when there are no requirements!

http://www.developsense.com/articles/2005-01-TestingWithoutAMap.pdf