Software Testing - Guerrilla Testing Tips


This is the introductory article to a series of occasional articles related to testing, from the perspective of a developer. These articles are intended to pass on some simple techniques to help a QA team to debug and test application application builds.

In many instances these will be the kinds of technique that might also be used by developers during development or even for debugging customer issues.

What we aim to do

Pass on examples of high bang to buck tips in the most digestible format. In some cases this will be in the form of a case study that aims to illustrate a key concept; this kind of format helps exposition by having multiple "bites at the cherry" to get a key rule of thumb across. Everyone understands differently; the aim should be to try all the possible routes in.

In other cases what is required is a ...

Software Testing - One CPU Better than Two CPU

This post was shared with us by Patrick Martin.

This is a very interesting real life example of a classic concurrency issue and very neatly illustrates the abstract process of fault finding a race condition. What makes it particularly interesting is that rather than involving high performance multi-threaded code it is in an automated user interface test.

The Problem

A test developer is in the process of working on an automated TestComplete test which is part of a suite that is run on a number of benchmark virtual machines. He discovers he has an interesting problem: his test fails quite regularly with an odd error on his machine but works on the test virtual machines. In an even more confusing development, when he debugs the test script in the test tool IDE the bug does not reproduce.

The Symptoms

The error is "invalid operation" when the fault reproduces and happens ...

Software Testing - Identify Testcase Pattern From Bugs

Bugs, Errors, Defects, Faults, Failures – All are indicators of customer dissatisfaction, especially when found in the production environment. With the increasing complexity of the software being developed, it is imperative to catch the high priority bugs before the application goes into production.

The purpose of this article is to provide a practical approach of identifying test cases so as to catch maximum bugs before the product goes into production environment.

There are several suggested ways of designing test cases such as Boundary Value Analysis, Equivalence Partitioning, Error guessing (Intuition) etc. However in this article we would learn how test cases can be derived from bugs which have been identified in the existing software.

The article is written in a bug-test-case approach. For every bug, one or more corresponding test cases are defined. The bugs and test cases listed are not specific to any application, but may apply to one or ...

Software Testing - Performance Testing Types

This article talks about the following areas in Performance testing.

  • Determine the type of Performance tests to be conducted
  • Determine the transaction mix
  • Methodology for Tool selection
  • Considerations while scripting those transactions

The ‘take-away’ from this article would be all of the above and the risks and benefits of each type of Performance tests, which will help you understand the kind of tests that you need to conduct based on your Client’s specifications.

Determine the type of Performance test to be conducted

In order to solve a performance need. It is very important to know the types of performance tests that can be conducted that fits the Customer’s requirement.

Performance tests can be broadly classified in to * Load tests * Stress tests * Endurance tests * Spike tests * Capacity testing * Load test

Load tests are performance tests which are focused on determining or validating performance characteristics of the product under test ...

Software Testing - A Cautionary Tale

There are some basic rules of thumb which will serve you well in testing any application that deals with lists of data (and which applications don't?).

1.1; few; many"

2."don't make any assumptions"

3."remember to mix it up a little"

This case study covers a very interesting example of where following the rules of thumbs exactly paid dividends.

The Problem

There was an interactive reporting solution that was having performance issues: essentially there was some pathological performance degradation under some circumstances. The code contributing the biggest slice of time wastage was in a 3rd party component that really could not be

There were multiple passes at the problem and the usual things were done:

  • Direct: get the problem project and simply pause the debugger at the obvious pain point
  • Indirect: scrub the code looking for opportunities to
  • (Eventually) Validation through testing: write an automated script ...

Software Testing - Performance Testing Requirements

The scope of this article is limited to the need, approach for requirement collection and the steps involved for Performance Testing.

We all know and understand that not “one-size-fits-all”. The approach discussed in this article predominantly fits in to most scenarios but is not limited to or the only process to go about.


Performance is a "must have" feature. No matter how rich your product is functionally, if it fails to meet the performance expectations of your customer the product will be branded a failure.

Application architectural design decisions may be greatly influenced by the importance placed by the customer on one or more specific requirements. Incorrect design decisions, made at the outset of a project as a result of invalid assumptions, may become impossible to remedy downstream. The goal of performance testing is not to find bugs, but to eliminate bottlenecks and establish a baseline for future regression ...

Testing Cookies in Web Applications

This article is written by Anamika Chowdhury from HCL. She can be contacted at

A "cookie" is a small piece of information sent by a web server to store on a web browser so it can later be read back from that browser. This is useful for having the browser remember some specific information. These are small data files which act as unique identifiers and allow our site to remember a particular user. Cookies do not harm computer. Certain areas of our web site, such as our forums use cookies. Some times user's personal information is stored in cookies and if someone hacks the cookie then hacker can get access to your personal information. Even corrupted cookies can be read by different domains and lead to security issues. This is why testing of website cookies is very important.

In this white paper, we will focus ...

Software Testing - Bayesian Theorem in Testing Maps

This article is written by Mr. Ashish Harsh for us. Thanks Ashish for sharing your knowledge / insight with us.

Software testing is essentially an exercise of continuous exploration, learning and questioning. This exercise becomes very interesting and challenging at times, when application under test is as complex as Maps. You must have used applications like Google Maps, Yahoo Maps etc. Primary use of these applications is to help users in finding route. As an input to these applications, user gives source and destination and based on this information, maps give them directions to reach from source to destination. You might think from the description that application is simple, but it has got numerous challenges.

As a tester you need to find out relevant queries and also quality of results produced by the system.

During Beta testing of the application, we got thousands of queries and input data which were used ...

Software Testing - Transaction Mix in Performance Testing

In any real world scenario, not all users will do the same transaction. In order to simulate the same, the Performance Analyst must determine the mix of transactions/mix of browsers for every test that needs to be conducted. For ex: Some of your clients may be using IE and some may be using Mozilla You need to have the data of % of usage. [Which you should collect during Requirement Collection]

Type Of Browser Transaction Name % Of User
Mozilla Search 20
IE Search 50
Opera Search 30

Similarly, the transactions itself can be divided based on the Percentage of usage of that application

Transaction Name % Of Users
Login Search 60
Login Add Users 20
Login Delete Users 20
  1. Methodology for Tool selection

There are a number of Performance testing tools available in the market .The following are some of the considerations for selecting a Performance testing tool

Look at the ...