// determine break-even point
		if Tk < Tb && th1 < 0 {
			th1 = th
			fmt.Print("  break-even point")
		}

		// determine diminishing return
		if 0 < delta && delta < deltaOld && th2 < 0 {
			th2 = th
			fmt.Print("  diminishing return")
		}
		deltaOld = delta

		fmt.Println()

		// trigger counter
		if th1 >= 0 && th2 >= 0 && count < 0 {

        Assert.assertTrue(f2 instanceof SmbFile);
        try ( SmbTreeHandleInternal th1 = (SmbTreeHandleInternal) ( (SmbFile) f1 ).getTreeHandle();
              SmbTreeHandleInternal th2 = (SmbTreeHandleInternal) ( (SmbFile) f2 ).getTreeHandle();
              SmbSessionInternal sess1 = th1.getSession().unwrap(SmbSessionInternal.class);

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