How can I test SwiftUI views using Swift Testing framework?

To test SwiftUI views using the Swift Testing framework, you can follow these steps:

1. Create a Test File: Start by creating a new file in your test folder. For example, you might name it PlantTests.

2. Import the Testing Framework: Import the Swift Testing framework and your app module.

3. Write a Test Function: Define a function for your test and use the @Test attribute to mark it as a test. You can provide a custom display name as an argument to the @Test attribute to make it easier to understand what the test is doing.

4. Use the expect Macro: Within your test function, use the expect macro to evaluate the result of any Swift expression. This macro allows you to write both simple and complex checks.

5. Organize Tests with Tags: Swift Testing allows you to use tags to organize and filter your tests. You can create custom tags and apply them to your tests to group related tests together.

Here is an example of how you might write a test for a SwiftUI view:

import SwiftTesting
import MyApp

@Test("Planting Roses")
func testPlantingRoses() {
    // Create a plant of type Rose
    let rose = Plant(type: .rose)
    
    // Create a second plant of type Rose with a specific style
    let graftedRose = Plant(type: .rose, style: .grafting)
    
    // Verify that the default planting style is grafting
    expect(rose.style == .grafting)
    expect(graftedRose.style == .grafting)
}

Additional Features of Swift Testing

• Async/Await Support: Swift Testing integrates seamlessly with Swift concurrency, supporting async/await and actor isolation.
• Parameterized Tests: You can easily parameterize tests to run the same logic over a sequence of values.
• Tag-Based Organization: Tags can be used to group tests across different suites, making it easier to run related tests together.

For more detailed information, you can refer to the sessions from WWDC:

• Meet Swift Testing
• What’s new in Xcode 16

These sessions provide comprehensive insights into the features and usage of the Swift Testing framework.