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Software Testing Methods
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Increas Capacity Testing
When you begin your stress testing, you will want to increase your capacity testing to make sure you
are able to handle the increased load of data such as ASP pages and graphics. When you test the ASP
pages, you may want to create a page similar to the original page that will simulate the same items
on the ASP page and have it send the information to a test bed with a process that completes
just a small data output. By doing this, you will have your processor still stressing the system
but not taking up the bandwidth by sending the HTML code along the full path. This will not stress
the entire code but will give you a basis from which to work. Dividing the requests per second
by the total number of user or threads will determine the number of transactions per second.
It will tell you at what point the server will start becoming less efficient at handling the
load. Let's look at an example. Let's say your test with 50 users shows your server can handle
5 requests per seconf, with 100 users it is 10 requests per second, with 200 users it is 15
requests per second, and eventually with 300 users it is 20 requests per second. Your requests
per second are continually climbing, so it seems that you are obtaining steadily improving
performance. Let's look at the ratios:
05/50 = 0.1
10/100 = 0.1
15/200 = 0.075
20/300 = 0.073
From this example you can see that the performance of the server is becoming less and less efficient
as the load grows. This in itself is not necessarily bad (as long as your pages are still returning within your target time frame). However, it can be a useful indicator during your optimization
process and does give you some indication of how much leeway you have to handle expected peaks.
Stateful testing
When you use a Web-enabled application to set a value, does the server respond correctly later on?
Privilage testing
What happens when the everyday user tries to access a control that is authorized only for adminstrators?
Speed testing
Is the Web-enabled application taking too long to respond?
Boundary Test
Boundary tests are designed to check a program's response to extreme input values. Extreme output values are generated by the input values. It is important to check that a program handles input values and output results correctly at the lower and upper boundaries. Keep in mind that you can create extreme boundary results from non-extreme input values. It is essential to analyze how to generate extremes of both types. In addition. sometime you know that there is an intermediate variable involved in processing. If so, it is useful to determine how to drive that one through the extremes and special conditions such as zero or overflow condition.
(Continued on next part...)
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