     
     func testIsNotRunning() {
         var dispatchTimer: DispatchTimer = DispatchTimer(interval: 0.25, closure: {
-            (timer: DispatchTimer?, invocations: Int) in
+            (timer: Timer, invocations: Int) in
         })
         
         XCTAssertFalse(dispatchTimer.isRunning)


    func testStartPassCancel() {
        var dispatchTimer: DispatchTimer = DispatchTimer(interval: 0.25, closure: {
            (timer: DispatchTimer?, invocations: Int) in
        })
        
        XCTAssertTrue(dispatchTimer.isValid)

    
    func testIsRunning() {
        var dispatchTimer: DispatchTimer = DispatchTimer(interval: 0.25, closure: {
            (timer: Timer, invocations: Int) in
        })
        
        dispatchTimer.start(true)
