thepearl

struct ShadowBorderModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .border(Color.black, width: 1)
            .shadow(radius: 5)
    }
}

extension View {
    func dropShadow() -> some View {

thepearl

struct CustomView<Content: View>: View {
    let content: () -> Content

    init(@ViewBuilder content: @escaping () -> Content) {
        self.content = content
    }

    var body: some View {
        content()
    }

thepearl

struct WrapperView<Content: View>: View {
    let content: () -> Content

    init(@ViewBuilder content: @escaping () -> Content) {
        self.content = content
    }

    var body: some View {
        VStack(alignment: .center) {
            content()

thepearl

struct HeaderView: View {
    let title: String
    let subtitle: String

    @ViewBuilder
    var body: some View {
        VStack(alignment: .leading) {
            Text(title)
                .font(.largeTitle)

thepearl

struct VStack<Content: View>: View {
    let content: () -> Content

    init(@ViewBuilder content: @escaping () -> Content) {
        self.content = content
    }

    var body: some View {
        // Create and arrange the subviews in a vertical stack.
        content()

thepearl

class MyViewTests: XCTestCase {
    func testMyView() throws {
        let dataFetcher = MockDataFetcher()
        let viewModel = MyViewModel(dataFetcher: dataFetcher)
        let view = MyView(viewModel: viewModel)

        let window = UIWindow()
        window.rootViewController = UIHostingController(rootView: view)
        window.makeKeyAndVisible()

thepearl

class MyViewModelTests: XCTestCase {
    func testFetchData() {
        let dataFetcher = MockDataFetcher()
        let viewModel = MyViewModel(dataFetcher: dataFetcher)

        let expectation = XCTestExpectation(description: "Fetch data")

        dataFetcher.fetchDataResult = "test data"
        viewModel.fetchData()
        

thepearl

let expectedOutput = "Hello, World!"
let publisher = SomePublisher<String, Error>()

let cancellable = publisher
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished:
            break
        case .failure(let error):
            XCTFail("Publisher failed with error: \(error)")

thepearl

import Foundation
import SwiftUI
import Combine
import Resolver

// MARK: - Presentation Layer

struct MyView: View {
    @ObservedObject var viewModel: MyViewModel

thepearl

import Foundation
import SwiftUI
import Combine

// MARK: - Presentation Layer

struct MyView: View {
    @ObservedObject var viewModel: MyViewModel
    
    var body: some View {