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Make mega yield configurable by environment variable #2064

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Apr 27, 2023
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Make mega yield configurable by environment variable #2064

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17 changes: 12 additions & 5 deletions Sources/ComposableArchitecture/TestStore.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -2365,17 +2365,24 @@ class TestReducer<State, Action>: ReducerProtocol {
}
}

extension Task where Success == Never, Failure == Never {
// NB: We would love if this was not necessary, but due to a lack of async testing tools in Swift
// we're not sure if there is an alternative. See this forum post for more information:
extension Task where Success == Failure, Failure == Never {
// NB: We would love if this was not necessary. See this forum post for more information:
// https://forums.swift.org/t/reliably-testing-code-that-adopts-swift-concurrency/57304
@_spi(Internals) public static func megaYield(count: Int = 10) async {
for _ in 1...count {
@_spi(Internals) public static func megaYield(count: Int = defaultMegaYieldCount) async {
for _ in 0..<count {
await Task<Void, Never>.detached(priority: .background) { await Task.yield() }.value
}
}
}

@_spi(Internals) public let defaultMegaYieldCount = max(
0,
min(
ProcessInfo.processInfo.environment["TASK_MEGA_YIELD_COUNT"].flatMap(Int.init) ?? 20,
10_000
)
)

// NB: Only needed until Xcode ships a macOS SDK that uses the 5.7 standard library.
// See: https://forums.swift.org/t/xcode-14-rc-cannot-specialize-protocol-type/60171/15
#if swift(>=5.7) && !os(macOS) && !targetEnvironment(macCatalyst)
Expand Down