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Swift 6 warnings and snapshotting WKWebView on macOS #984

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hanneskaeufler opened this issue May 6, 2025 · 1 comment
Open

Swift 6 warnings and snapshotting WKWebView on macOS #984

hanneskaeufler opened this issue May 6, 2025 · 1 comment

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@hanneskaeufler
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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
Image

Crash with @MainActor
Image
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
@hanneskaeufler
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I presume this is different than #805 and also #888 didn't solve it for me.

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@hanneskaeufler