then:
        runBuild {
            succeeds()
            receivedBuildEvents()
            waitBeforeModification javaSrcFile
            javaSrcFile.setText('public class Thing { public static final int FOO = 1; }')
            succeeds()
            receivedBuildEvents()
            cancel()
        }
    }

    void receivedBuildEvents() {
        events.assertIsABuild()
        events.clear()
    }