UI Testing: Slider fails to adjust when nested in Table View Cell

In UI Testing on Xcode 9.0 (9A235), interacting with UISliderwith adjust(toNormalizedSliderPosition:) does not work at all when UISlideris nested in a UITableViewCell.

I have tested in many different scenarios: - Normal UISliders not embedded in a UITableView work fine with the adjust method. - UISlider that co-exists with a UITableView but not inside a Table View Cell continues to work with adjust - UISlider in a UITableView can be uniquely identified. - UISlider identified in a UITableView can respond to simple event like tap() - UISlider identified in a UITableView doesn't work with adjust method at all, even when I modify the number of rows to 1. The error message is:

Failure fetching attributes for element pid: 24415, elementOrHash.elementID: 106102876671744.43: Error Domain=XCTDaemonErrorDomain Code=13 "Fetching value for attribute 5011 returned AX error -25205." UserInfo={NSLocalizedDescription=Fetching value for attribute 5011 returned AX error -25205.}

Related discussion I found online: https://forums.developer.apple.com/thread/77445

I have uploaded my code online too if anyone is interested in looking at it.

I have already submitted a bug report to Apple regarding this. What I am asking is, does anyone know of a possible workaround I can use to adjust the UISlider values when the slider is nested in a UITableViewCell? Thanks!

You can use this as a workaround:

func testSliderAdjustsInTableView() {
    let app = XCUIApplication()

    app.staticTexts["Slider in Table View UI Test"].tap()

    let cell = app.tables.element.cells["cell 0"]
    let button = cell.buttons["Test Button"]
    button.tap()

    let slider = cell.sliders["value slider"]
    XCTAssert(slider.exists)

    let fiftyPercent = slider.coordinate(withNormalizedOffset: CGVector(dx: 0.5, dy: 0.5))
    let ninetyPercent = slider.coordinate(withNormalizedOffset: CGVector(dx: 0.9, dy: 0.5))

    fiftyPercent.press(forDuration: 0.1, thenDragTo: ninetyPercent)

    XCTAssertEqual(slider.value as! String, "90 %")
}