PARALLEL TEST EXECUTION

Aspects of the subject matter described herein relate to test execution. In aspects, a collection is obtained of tests that are configured to be executed in a primary test environment. One or more of the tests are then executed in an auxiliary test environment in parallel with executing one or more of the tests in the primary test environment. Before executing a test in the primary test environment, a check is performed to determine whether the test has already been executed in the auxiliary test environment. If it has, the test is not executed in the primary test environment and results are obtained and incorporated into the primary test environment to make it appear as if the test executed in the primary test environment.