How to do testing in SwiftUI?

To do testing in SwiftUI, you can leverage the new Swift Testing framework introduced by Apple. Here are some key points and steps to get you started:

Creating a Test:
- Start by creating a new file in your test folder.
- Import the testing framework and your app.
- Write a function for your test and add the @Test attribute to it. This marks the function as a test case.
```
import TestingFramework
import MyApp

@Test
func testPlantingRoses() {
    let plant = Plant(type: .rose)
    XCTAssertEqual(plant.style, .grafting)
}
```
Using Macros:
- Use the expect macro to verify results. This macro allows you to write simple or complex Swift expressions to check the expected outcomes.
```
@Test
func testPlantingRoses() {
    let plant = Plant(type: .rose)
    expect(plant.style == .grafting)
}
```
Organizing Tests with Tags:
- Swift Testing allows you to use tags to organize and filter your tests. You can add tags to your test functions to group related tests together.
```
@Test(tags: ["planting"])
func testPlantingRoses() {
    let plant = Plant(type: .rose)
    expect(plant.style == .grafting)
}
```

Parameterized Tests:

You can create parameterized tests to run the same logic with different inputs. This helps avoid duplicating test code.

@Test
func testPlantingStyles() {
    let styles: [PlantStyle] = [.grafting, .budding, .cutting]
    for style in styles {
        let plant = Plant(type: .rose, style: style)
        expect(plant.style == style)
    }
}

Concurrency and Async/Await:
- Swift Testing integrates seamlessly with Swift concurrency, supporting async/await and actor isolation. This is useful for testing asynchronous code.
```
@Test
func testAsyncPlanting() async {
    let plant = await Plant(type: .rose)
    expect(plant.style == .grafting)
}
```

For more detailed information and examples, you can refer to the following sessions from WWDC 2024:

These sessions cover the new Swift Testing framework, its features, and how to integrate it into your SwiftUI projects.