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It is vital that all the tests are properly documented so that testing can be carried out systematically and effectively. We also need to keep a record of the results so that the quality assurance can be convincing. Maintenance will also require information about the testing results. For each requirement, which should be properly numbered in the requirements document, we will generate a set of tests. The details should be kept in a suitably designed spreadsheet. Table 7.1 shows an example.
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Test input Load program Click(customers) Browser open Start page open Page loads Customers page displayed No change in display Start Start Customers Constraints/ prerequisites Expected output Final state Comments Type random keyboard characters Reboot Start page open Start page open Invalid input Invalid input Standard data entry1 page page page page Standard data entry2 Standard data entry3 Empty data entry Close down, database unaffected Data displayed data displayed Data displayed Error message Con rm Con rm Con rm Customers Invalid input Customers open Customers open Customers open Customers open
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Table 7.1 Systems/Acceptance Test De nitions
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Requirement
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Test reference
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Test purpose
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1.1.1 1.1.2
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1.1.1 1.1.2.1
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Test front page Load customers page Load customers page Load customers page Enter customer details Enter customer details Enter customer details Enter customer details
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The de nitions of standard data entry1, standard data entry2, and standard data entry3 need to be made somewhere in an appendix to this plate.
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7.7 Non-Functional Testing
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Table 7.2 Test Data File Test ref. ..... 2.3.2.1 Function sequence/ path click(customer) ; enter(customer) ; enter(order) Test sequence Expected output No change to database
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Final state
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.....
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,click(customer). ; ,enter( standard_data_entry1 ). ; ,enter( order_details ) .
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Con rm customer
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Table 7.3 Test Results Table (System Version 1.0) Test ref. 1.1.2.1 1.1.2.2 1.1.2.3 Date/ personnel 12/3/02 Pete 12/3/02 Pete 12/3/02 Pete Result pass/ fail P F P Fault System crash Action Debug Comments Jane alerted (13/3/02) System closes, no losses
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The next stage is to try to automate the testing as far as possible. We need to create a le of test inputs, one set of inputs for each test. These could be kept in a spreadsheet, the test data le (Table 7.2) and a script written to extract these inputs and put them into a standard text le, one line per test. Another script would extract each input sequence and apply it to the code. This is sometimes easier to do in some cases than in others. With GUI front ends, it is sometimes dif cult to access the key parameters/events from inside like this, and anyway one would want to test the overall program as well. Test software is available, at a price, to automate a lot of the interface interactions, but for university projects it may be necessary to rely on manual techniques. The test results le (Table 7.3) is a vital resource that will have to kept up to date during testing. It describes what has been done, what has been xed, and what remains to be done.
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NON-FUNCTIONAL TESTING
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Although the principal purpose of the system test is to con rm that the functional requirements have been met, it is also necessary to consider the non-functional requirements and quality attributes. We will establish compliance with these also through suitable types of testing. This is done prior to nal delivery of any version. We can regard the testing of the non-functional requirements together with the testing of the functional requirements as playing the role of the acceptance tests for the software. This needs the active involvement and the agreement of the customer.
7 Designing the System Tests
Let us look at some of the non-functional requirements mentioned in the previous chapter.
Reliability
For a single user, the system should crash no more than once per 10 hours. For the rst requirement, there is very little alternative to just running the system and logging any problems where functionality is lost. Other approaches would be to examine the technology in use, age and type of workstations and servers, and type of software technology used, in particular how stable it is and what is currently known about its reliability. Demonstrating compliance with this requirement will be dif cult within the constraints of this type of project. The system should produce the correct values for any mathematical expression 100% of the time. Showing that the calculations, if any, are always correct is pretty well impossible; one can log errors if they arise during nal testing, but there is very little more that can be done in a practical way. If the system crashes, it should behave perfectly normally when loaded up again with minimal data loss. It is easy enough to crash the system, carrying out a reboot for example, and this can be the basis for this type of test. What is meant by minimal information loss needs to be thought about. A bare minimum would be no loss of any data that has been committed to the database. If some temporary recovery les can be developed, this would be better but probably beyond the scope of the project.