Testing Outsourcing Companies: How Should I Test?
It is worth knowing that classes are tested using special drivers. Drivers are regarded as dummy modules that emulate behavior of software components that a module under test is dependent on. Therefore, they are mostly used in module testing. There are several ways to implement the test driver:
The test driver is implemented as a separate class. Its methods create objects for a class being tested and invoke their methods, including static class methods. This way can be used to test the public part of the class.
The test driver is implemented as a class that is inherited from a class under test. Unlike the previous method, this test driver has access not only to the public, but also to the protected part of the class. Testing outsourcing companies will assist you in cutting costs and building top notch software apps competitive in the market.
The test driver is implemented directly in a class under test (the class is complemented with diagnostic methods). Such a test driver has access to the entire implementation of the class, including its private members. In this case, the methods of the class include invocations of debug functions, and the agents that monitor some events during testing.
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In developing the class specification it is possible to use one of the following approaches:
Contractual approach. The interface is defined as the commitments of the sender and the receiver that enter into interaction. The operation is defined as a number of obligations & duties of each party, and at that responsibilities to each other are observed by both the sender and the receiver.
Defensive programming approach. Here, the interface is defined primarily in the language of the receiver. The operation returns the query result whether it is success or failure for a specific reason (for instance, in respect of an invalid input value). In other words, the appropriate receiver ensures that invalid data are not being inputted, i.e. checks the validity and admissibility of input data, and after receiving the request informs the sender about the result of the query.
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