A fix defining fix defining a plurality of unique changes to a computer program can be identified. Program code units in the computer program changed by the unique changes are identified and corresponding data entries in a first data structure can be generated. A number of test cases available to test the program code units in the computer program changed by the unique changes can be determined by matching each of the program code units to corresponding data entries contained in a second data structure that correlates program code units to test cases. A test readiness index indicating a readiness of the fix to be tested can be automatically generated. The test readiness index can be based on a number of unique changes to the computer program defined by the fix and the number of test cases available to test the unique changes. The test readiness index can be output.