Software Quality Assurance Companies: Scenario Testing
Test development process based on the use of scenarios involves performing the following steps:
- Determination of the use case model, including the operational environment of the product and the “actors”. An actor can be a user, a different product, hardware component, and the like, namely everything that the product interacts with. Separation into the environment and the actors is performed figuratively and is used to describe the best ways to use the product.
- Development of use scenarios of the product. Depending on the product, description of the script and the chosen approach can be strictly defined, parameterized or have some degree of uncertainty. For example, the description of the script made in MSC language allows to assign parameterized scripts with the ability to reorder events.
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- Development of test sets that cover the specified scenarios. In view of the uncertainty inherent in the script, each test script may cover one, several scenarios, or, conversely, part of the script.
Using scripts does not require a full formal requirements specification, but may require more time for development and testing.
Another feature of scenario testing is that this method allows you to check the specific conditions of use of the product that make it possible for you to find defects that requirements verification method may miss. Even the best testing service providers are not mighty people and can fail to run successful tests if an inappropriate test method is used.
Example of how to use requirements specification for the development of tests.
Well, you can create the following script and test.
- Scenario: A user has two separate management strands, one of which is responsible for generating the complete transactions by means of DoTransaction, and another – for collecting the transactions from the address directory and some of the data when this information comes from various sources. Thus, the second strand uses calls to DoAddressTenure and DoDataTenure.
- Description of the tests: Call DoAddressTenure with address A1, call DoTransaction with address A2 and the D2 data, call DoDataTenure with the D1 data. Check consecutive appearance of two transactions: {A1, D1} H {A2, D2} on the bus.
During execution of this test it was revealed that DoTransaction feature had been implemented through the calls to DoAddressTenure and DoDataTenure, which had led to occurrence of bus transactions such as {A1, D2} and {A2, D1}. This defect can be too difficult to detect, if tests are developed based only on the requirements specification.
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