This is a duplicate of Bug 571316 - JUnit tests in org.eclipse.jface.text.tests.contentassist are failing on Windows and Mac
I will close the bug in bugzilla and this bug will be tracked here.
The JFace text tests in org.eclipse.jface.text.tests.contentassist fail in the nightly build as below
Windows
- testCompleteActivationChar
Both Windows and Mac
- testSyncFailureNPE