Spotted in our nightly headful test run:

```
QPathTest > executionError FAILED
    org.opentest4j.AssertionFailedError: Exceeded timeout limit of 10000 msec
        at app//org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:39)
        at app//org.junit.jupiter.api.Assertions.fail(Assertions.java:134)
        at app//test.util.Util.runAndWait(Util.java:156)
        at app//test.util.Util.runAndWait(Util.java:127)
        at app//test.util.Util.shutdown(Util.java:365)
        at app//test.com.sun.marlin.QPathTest.teardownOnce(QPathTest.java:146)
```