1. A computer program product comprising: one or more non-transitory computer readable storage media and program instructions stored on the one or more non-transitory computer readable storage media, the program instructions comprising: program instructions to receive a first request to generate a first test case, wherein the first request comprises a coverage schema associated with a first set of events to be covered in the generated first test case; program instructions to update the coverage schema, wherein the program instructions to update the coverage schema comprise program instructions to add a second set of events to be covered in the generated first test case, wherein the second set of events is determined using machine learning techniques or by performing one of a union operation, an intersection operation, or a cross-product operation between at least two events of the first set of events; program instructions to generate constraints used to satisfy requirements for meeting the first set of events and the second set of events in the updated coverage schema; program instructions to, responsive to generating constraints used to satisfy requirements for meeting the first set of events and the second set of events in the updated coverage schema, add the generated constraints to a constraint library; program instructions to generate the first test case using the generated constraints and the updated coverage schema; program instructions to perform a test simulation to identify a passing test case; program instructions to, responsive performing a test simulation to identify a passing test case, update a coverage database to reflect the identified passing test case; program instructions to receive a second request to generate a second test case, wherein the second request comprises a coverage schema associated with a third set of events to be covered in the generated second test case; program instructions to update the coverage schema, wherein the program instructions to update the coverage schema comprise program instructions to add a fourth set of events to be covered in the generated second test case, wherein the fourth set of events is determined using machine learning techniques or by performing one of a union operation, an intersection operation, or a cross-product operation between at least two events of the third set of events; and program instructions to, responsive to a failure obtained in executing the program instructions to generate constraints, transmit a notification to the constraint library to generate constraints for the second test case using machine learning techniques.