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struct YourLibraryView: View {

    @State var page: Int = 0 //// keeps track of which category index we are at
    @State var nestedPages: [Int] = [0, 0] /// keeps track of which sub category index we are at for each category
    @State var indicatorOffsets : [CGFloat] = [0,0] /// keepts track of indicator offsets for each category

    var data = Array(0..<2)
    var nestedData = Array(0..<3)

    var body: some View {

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.onPageChanged({ _ in
    self.allowSubCategoryDragging = true
})
.swipeInteractionArea(.allAvailable)
.simultaneousGesture(DragGesture().onChanged({value in
    /// catch moving to category
    if self.allowSubCategoryDragging {
        let movingCategoryRight = self.page == 0 && self.nestedPages[self.page] == 2 && value.translation.width < 0
        let movingCategoryLeft = self.page == 1 && self.nestedPages[self.page] == 0 && value.translation.width > 0
        if movingCategoryRight || movingCategoryLeft{

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.simultaneousGesture(DragGesture().onChanged({value in
    /// catch moving to category
    if self.allowSubCategoryDragging {
        let movingCategoryRight = self.page == 0 && self.nestedPages[self.page] == 2 && value.translation.width < 0
        let movingCategoryLeft = self.page == 1 && self.nestedPages[self.page] == 0 && value.translation.width > 0
        if movingCategoryRight || movingCategoryLeft{
            self.allowSubCategoryDragging = false
        }
        else{
            let westAsCanBe = self.nestedPages[self.page] == 0 && self.page == 0 && value.translation.width > 0

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public final class NetworkClient {
    private let session: URLSession = .shared

    public init() { }

    func executeRequest(request: URLRequest, completion: @escaping (Result<Data, Error>) -> Void) {
        session.dataTask(with: request) { (data, _, error) in
            if let error = error {
                completion(.failure(error))
                return

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protocol NetworkClientProtocol {
    func executeRequest(request: URLRequest, completion: @escaping (Data?, Error?) -> Void)
}

extension URLSession: NetworkClientProtocol{
    /// this is where the real request happens
    func executeRequest(request: URLRequest, completion: @escaping (Data?, Error?) -> Void) {
        let task = dataTask(with: request) { (data, _, error) in
            completion(data, error)
        }

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protocol NetworkClientProtocol {
    func executeRequest(request: URLRequest, completion: @escaping (Data?, Error?) -> Void)
}

extension URLSession: NetworkClientProtocol{
    /// this is where the real request happens
    func executeRequest(request: URLRequest, completion: @escaping (Data?, Error?) -> Void) {
        let task = dataTask(with: request) { (data, _, error) in
            completion(data, error)
        }

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public final class NetworkClient {
    private let n: NetworkClientProtocol

    init(n: NetworkClientProtocol = URLSession.shared) {
        self.n = n
    }

    func executeRequest(request: URLRequest, completion: @escaping (Result<Data, Error>) -> Void) {
        n.executeRequest(request: request){ (data, error) in
            if let error = error {

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func testExecuteRequest_failure_noData() throws {

        /// create mock to return nil
        class NetworkMock : NetworkClientProtocol{
            func executeRequest(request: URLRequest, completion: @escaping (Data?, Error?) -> Void) {
                completion(nil, nil)
            }
        }

        /// inject mock and execute request

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func GetDetails() string {
	return "wow this is gonna be good"
}

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  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>