Described herein are one or more implementations for facilitation of computer software testing. One or more implementations, described herein, determine logical type of one or more test input-parameters based upon metadata placed on a function under test (FUT) of software. Using that determined logical type, an implementation generates data values. In some instances, those generated values are values selected from a repository of data values with associated logical types. The selection is based upon the determined logical type. After generating data values for testing the FUT, an implementation supplies the generated data values as input to the FUT.