Try to fix parallelLockWithLabelFillsVariable (#518)

* Try to fix parallelLockWithLabelFillsVariable

* parallelLockWithLabelFillsVariable

* isPaused

* isPaused

src/test/java/org/jenkins/plugins/lockableresources/LockStepTest.java

@@ -951,6 +951,14 @@ public void parallelLockWithLabelFillsVariable() throws Exception {
     // Unlock resources
     SemaphoreStep.success("wait-inside/1", null);
     j.waitForMessage("Lock released on resource", b1);
+
+    // wait until both resources are free.
+    // otherwise the next isPaused() check might fail
+    j.waitForMessage("VAR2 IS", b1);
+    // this sometimes fails, but it does not looks like a failure in the plugin self
+    // and it is not necessary to check it here, because this test case will check
+    // env variable resolution and not if the paused actions works
+    // therefore, when it fails again, you can comment it out.
     isPaused(b1, 2, 0);
 
     // Now the second parallel branch should get and release the lock...