Description
Describe the bug
It appears we're currently stuck between a rock and a hard place when snapshotting a WKWebView on macOS.
When using Swift-Testing, in swift 5 mode, we get the concurrency warnings, but the snapshotting appears to work.
When switching to swift 6 mode and annotating the test @MainActor, the snapshotting hangs.
To Reproduce
Create a Unit Test Bundle and add swift-snapshot-testing to the dependencies of the project. Use Swift-Testing as the test framework. Create the following swift test. Use swift 5 mode.
import Testing
import WebKit
import SnapshotTesting
struct MySnaphotTests {
@Test func example() async throws {
let webView = WKWebView() // Expression is 'async' but is not marked with 'await'; this is an error in the Swift 6 language mode
webView.loadHTMLString("<html><body><h1>Hello, World!</h1></body></html>", baseURL: nil) // Expression is 'async' but is not marked with 'await'; this is an error in the Swift 6 language mode
assertSnapshot(
of: webView, as: .image(size: .init(width: 800, height: 600)),
timeout: 10)
}
}Expected behavior
No concurrency warnings. Or adding @MainActor to the test and not having it hang/timeout.
Screenshots
Warnings without @MainActor
Crash with @MainActor
If applicable, add screenshots to help explain your problem.
Environment
- swift-snapshot-testing version 1.18.3
- Xcode 116.3
- Swift 5
- OS: macOS 15.2