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Tutorial with Examples
Testcover.com provides a unique test case generator service to improve test productivity by reducing the number of test cases run. The service also improves the tester's ability to find faults by providing better coverage of combinations of test factor values. The test designer chooses which factors are required for the test job. Then the test case generator produces the test cases which will cover all pairs of factor values. The generator works to minimize the number of test cases so as to maximize the test efficiency.

The test case generator provides a simple yet versatile HTML form interface. Requests are entered into the form with our exclusive Direct Product Block (DPB) notation. DPB notation allows the generator to adapt to real-world constraints which often prevent testing with certain combinations of test factor values. The interface also enables the test designer to generate error test cases easily (in addition to test cases for normal operation). Examples in this tutorial illustrate the use of DPB notation in these situations. A detailed specification of DPB notation is given in the Instructions (available to trial users and subscribers).

Generator results are provided as HTML tables accessible from a browser. They can be saved for use with a spreadsheet also. In addition, a WSDL interface is available for other test tools to access the generator directly. Web Services Description Language (WSDL) is an XML language for describing network services. The World Wide Web Consortium (W3C) has endorsed WSDL to promote its widespread deployment for enhanced functionality and interoperability.

This tutorial begins with an example illustrating the need for the service. It shows how to submit input data using the test case generator form, and how to read the results from the generator. Eight examples illustrate the use of the service. These include a simple test configuration design, a test configuration design with constraints, and a calendar test example with constraints and error values. The database table example shows how to use the generator to create records for testing a reservation system. The HTML form example illustrates how to partition test inputs when there are different classes of normal expected results, and the temperature conversion example introduces the concept of functional dependence to simplify the constraint analysis in a test design. The shopping cart and the thermostat examples demonstrate the consistent application of pairwise testing to the operation of a system, not just its configurations and data values. The tutorial ends with a description of some of the terms used here.
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