Enocean binding tests do not support concurrent test execution

[dvanherbergen]

To improve performance of the automated builds, I tried building using multiple concurrent threads: mvn -T 2 clean install. During these build, the enocean tests occasionally failed.

org.openhab.binding.enocean.internal.bus.RockerSwitchInDimmerOnOffProfileTest.lightenUpDuringVeryLongButtonPressDown

Update State expected:<INCREASE> but was:<null>
Stacktrace

java.lang.AssertionError: Update State expected:<INCREASE> but was:<null>
    at org.junit.Assert.fail(Assert.java:88)
    at org.junit.Assert.failNotEquals(Assert.java:743)
    at org.junit.Assert.assertEquals(Assert.java:118)
    at org.openhab.binding.enocean.internal.bus.RockerSwitchInDimmerOnOffProfileTest.lightenUpDuringVeryLongButtonPressDown(RockerSwitchInDimmerOnOffProfileTest.java:90)

org.openhab.binding.enocean.internal.bus.RockerSwitchInDimmerOnOffProfileTest.dimmLightDuringLongButtonPressUp

Update State expected:<DECREASE> but was:<null>
Stacktrace

java.lang.AssertionError: Update State expected:<DECREASE> but was:<null>
    at org.junit.Assert.fail(Assert.java:88)
    at org.junit.Assert.failNotEquals(Assert.java:743)
    at org.junit.Assert.assertEquals(Assert.java:118)
    at org.openhab.binding.enocean.internal.bus.RockerSwitchInDimmerOnOffProfileTest.dimmLightDuringLongButtonPressUp(RockerSwitchInDimmerOnOffProfileTest.java:104)

Failure was not consistent and not reproducable on a fast machine.

The tests should be updated so that they can be executed in parallel.

[martinvw]

I see this test failing frequently on the cloudbees buildserver too, don't know if it uses multiple concurrent threads.