How do I unit test a SwiftUI view?

To unit test a SwiftUI view, you can leverage the new Swift Testing framework introduced in Xcode 16. Here are the steps to get started:

Create a Test Target: If you don't already have a test target, you can create one in Xcode by going to File > New > Target and selecting a test target.
Import the Testing Framework: In your test file, import the necessary testing framework.
Write a Test Function: Define a test function and use the @Test attribute to mark it as a test. This will make Xcode recognize it as a test and display a run button alongside it.
Initialize the View: Create an instance of the SwiftUI view you want to test.
Use Expectations: Use the expect macro to verify the results. This allows you to write complex checks on your view's state or output.

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

import SwiftUI
import XCTest
import Testing

struct MyView: View {
    var body: some View {
        Text("Hello, World!")
    }
}

@Test
func testMyView() {
    // Initialize the view
    let view = MyView()
    
    // Use an expectation to verify the view's output
    expect(view.body) { body in
        // Check that the body contains a Text view with the correct string
        if let text = body as? Text {
            XCTAssertEqual(text.string, "Hello, World!")
        } else {
            XCTFail("Expected a Text view")
        }
    }
}

Relevant Sessions

These sessions provide detailed information on the new Swift Testing framework and how to use it effectively in your projects.