+import org.eclipse.linuxtools.tmf.core.exceptions.AttributeNotFoundException;
+import org.eclipse.linuxtools.tmf.core.exceptions.StateValueTypeException;
+import org.eclipse.linuxtools.tmf.core.exceptions.TimeRangeException;
+import org.eclipse.linuxtools.tmf.core.exceptions.TmfTraceException;
+import org.eclipse.linuxtools.tmf.core.interval.ITmfStateInterval;
+import org.eclipse.linuxtools.tmf.core.statesystem.IStateChangeInput;
+import org.eclipse.linuxtools.tmf.core.statesystem.ITmfStateSystem;
+import org.eclipse.linuxtools.tmf.core.statesystem.StateSystemManager;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;