1. A computer-implemented method for providing test coverage data for a code change, said method comprising: detecting an incoming code change submitted to a code review system; comparing the incoming code change to a previous version of the incoming code change previously submitted to the code review system; determining, based on the comparison, an extent to which the incoming code change has been modified from the previous version of the incoming code change previously submitted to the code review system; in response to the determined extent of the modification satisfying a threshold, performing one or more test coverage calculations for the incoming code change; in response to the extent of the modification not satisfying the threshold, maintaining a test coverage calculation performed for the previous version of the incoming code change previously submitted to the code review system; generating test coverage data for the incoming code change based on the one or more test coverage calculations performed or the test coverage calculation performed for the previous version of the incoming code change; and sending a notification of the generated test coverage data generated for the code change to at least one recipient associated with the code change.