Mark an XCTest method `async throws` and call the asynchronous API with `try await` directly: ```swift final class APIClientTests: XCTestCase { func testFetchUser() async throws { let client = APIClient(transport: StubTransport()) let user = try await client.fetchUser() XCTAssertEqual(user.id, 42) } } ``` Use structured async APIs rather than `Thread.sleep`. If the code is callback-based, bridge or test it with an `XCTestExpectation` and a reasonable timeout.
Scanned 9/5/2026
Install to Claude Code
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Mark an XCTest method `async throws` and call the asynchronous API with `try await` directly:
```swift
final class APIClientTests: XCTestCase {
func testFetchUser() async throws {
let client = APIClient(transport: StubTransport())
let user = try await client.fetchUser()
XCTAssertEqual(user.id, 42)
}
}
```
Use structured async APIs rather than `Thread.sleep`. If the code is callback-based, bridge or test it with an `XCTestExpectation` and a reasonable timeout.
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Use this skill when developing or maintaining browser extension code in the `browser/` directory, including Chrome/Firefox/Edge compatibility, content scripts, background scripts, or i18n updates.
