 import Foundation
 import Shared
 import XCTest
+
+func advanceTimestamp(timestamp: Timestamp, by: Int) -> Timestamp {
+    return timestamp + UInt64(by)
+}
+
+func advanceMicrosecondTimestamp(timestamp: MicrosecondTimestamp, by: Int) -> MicrosecondTimestamp {
+    return timestamp + UInt64(by)
+}
 
 extension Site {
     func asPlace() -> Place {


        history.insertOrUpdatePlace(site.asPlace(), modified: 1234567890).value

        let local = SiteVisit(site: site, date: Timestamp(1000 * 1437088398461), type: VisitType.Link)
        XCTAssertTrue(history.addLocalVisit(local).value.isSuccess)
    }
}

            let site = Site(url: "http://s\(0)ite\(0)/foo", title: "A \(0)")
            site.guid = "abc\(0)def"
            for i in 0...20 {
                addVisitForSite(site, intoHistory: history, from: .Local, atTime: advanceTimestamp(1439088398461, by: 1000 * i))
            }
            return succeed()
        }
