Redesign of a test tool to secure changes in the calculation core of a private health insurance

The main task of the calculation kernel is to calculate the premiums as well as surcharges and discounts for new contracts. It must be possible to calculate rate changes for existing contracts. The test tool uses control tables to simulate new business and rate changes on existing contracts and calls the calculation kernel to determine the premiums. In general, the premiums calculated may not change as a result of new or further development of the calculation kernel, except for technical changes. For this reason, the test tool compares the premiums of the old calculation kernel with those of the new calculation kernel, or the premiums before calculation kernel changes with the premiums after calculation kernel changes, to identify deviations.