asyncAssert

XCTest+AsyncAssert.swift

import XCTest

public extension XCTestCase {
    /// Runs the assertions provided in the main thread in an async way.
    /// Useful for testing objects that make async requests (using mocked protocols for the responses)
    /// - Parameters:
    ///   - expectation: The string representation of what we expect.
    ///   - asyncWaitDuration: Duration in seconds to wait before trying to assert the assertions. Default: 0.05.
    ///   - timeout: Maximum time in seconds to wait for the expectation. Default: 1 (plus the async await duration).
    ///   - assertions: escaping method containing all the assertions.
    func asyncAssert(
        _ expectation: String,
        after asyncWaitDuration: Double = 0.05,
        timeout: Double = 1,
        assertions: @escaping () -> Void
    ) {
        let expectation = XCTestExpectation(description: expectation)

        DispatchQueue.main.asyncAfter(deadline: .now() + asyncWaitDuration) {
            assertions()
            expectation.fulfill()
        }

        wait(for: [expectation], timeout: timeout + asyncWaitDuration)
    }
}