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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Async Algorithms open source project
//
// Copyright (c) 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
import XCTest
import AsyncAlgorithms
extension Sequence where Element: Sequence, Element.Element: Equatable & Sendable {
func nestedAsync(throwsOn bad: Element.Element) -> AsyncSyncSequence<[AsyncThrowingMapSequence<AsyncSyncSequence<Element>,Element.Element>]> {
let array: [AsyncThrowingMapSequence<AsyncSyncSequence<Element>,Element.Element>] = self.map { $0.async }.map {
$0.map { try throwOn(bad, $0) }
}
return array.async
}
}
extension Sequence where Element: Sequence, Element.Element: Sendable {
var nestedAsync : AsyncSyncSequence<[AsyncSyncSequence<Element>]> {
return self.map { $0.async }.async
}
}
final class TestJoinedBySeparator: XCTestCase {
func test_join() async {
let sequences = [[1, 2, 3], [4, 5, 6], [7, 8, 9]].nestedAsync
var iterator = sequences.joined(separator: [-1, -2, -3].async).makeAsyncIterator()
let expected = [1, 2, 3, -1, -2, -3, 4, 5, 6, -1, -2, -3, 7, 8, 9]
var actual = [Int]()
while let item = await iterator.next() {
actual.append(item)
}
XCTAssertEqual(expected, actual)
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_join_single_sequence() async {
let sequences = [[1, 2, 3]].nestedAsync
var iterator = sequences.joined(separator: [-1, -2, -3].async).makeAsyncIterator()
let expected = [1, 2, 3]
var actual = [Int]()
while let item = await iterator.next() {
actual.append(item)
}
XCTAssertEqual(expected, actual)
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_join_empty() async {
let sequences = [AsyncSyncSequence<[Int]>]().async
var iterator = sequences.joined(separator: [-1, -2, -3].async).makeAsyncIterator()
let expected = [Int]()
var actual = [Int]()
while let item = await iterator.next() {
actual.append(item)
}
XCTAssertEqual(expected, actual)
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throwing() async throws {
let sequences = [[1, 2, 3], [4, 5, 6]].nestedAsync(throwsOn: 5)
var iterator = sequences.joined(separator: [-1, -2, -3].async).makeAsyncIterator()
let expected = [1, 2, 3, -1, -2, -3, 4]
var actual = [Int]()
do {
while let item = try await iterator.next() {
actual.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(Failure(), error as? Failure)
}
XCTAssertEqual(expected, actual)
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throwing_separator() async throws {
let sequences = [[1, 2, 3], [4, 5, 6]].nestedAsync
let separator = [-1, -2, -3].async.map { try throwOn(-2, $0) }
var iterator = sequences.joined(separator: separator).makeAsyncIterator()
let expected = [1, 2, 3, -1]
var actual = [Int]()
do {
while let item = try await iterator.next() {
actual.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(Failure(), error as? Failure)
}
XCTAssertEqual(expected, actual)
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_cancellation() async {
let source : AsyncSyncSequence<[AsyncSyncSequence<Indefinite<String>>]> = [Indefinite(value: "test").async].async
let sequence = source.joined(separator: ["past indefinite"].async)
let finished = expectation(description: "finished")
let iterated = expectation(description: "iterated")
let task = Task {
var firstIteration = false
for await el in sequence {
XCTAssertEqual(el, "test")
if !firstIteration {
firstIteration = true
iterated.fulfill()
}
}
finished.fulfill()
}
// ensure the other task actually starts
await fulfillment(of: [iterated], timeout: 1.0)
// cancellation should ensure the loop finishes
// without regards to the remaining underlying sequence
task.cancel()
await fulfillment(of: [finished], timeout: 1.0)
}
}
final class TestJoined: XCTestCase {
func test_join() async {
let sequences = [[1, 2, 3], [4, 5, 6], [7, 8, 9]].nestedAsync
var iterator = sequences.joined().makeAsyncIterator()
let expected = [1, 2, 3, 4, 5, 6, 7, 8, 9]
var actual = [Int]()
while let item = await iterator.next() {
actual.append(item)
}
XCTAssertEqual(expected, actual)
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_join_single_sequence() async {
let sequences = [[1, 2, 3]].nestedAsync
var iterator = sequences.joined().makeAsyncIterator()
let expected = [1, 2, 3]
var actual = [Int]()
while let item = await iterator.next() {
actual.append(item)
}
XCTAssertEqual(expected, actual)
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_join_empty() async {
let sequences = [AsyncSyncSequence<[Int]>]().async
var iterator = sequences.joined().makeAsyncIterator()
let expected = [Int]()
var actual = [Int]()
while let item = await iterator.next() {
actual.append(item)
}
XCTAssertEqual(expected, actual)
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throwing() async throws {
let sequences = [[1, 2, 3], [4, 5, 6]].nestedAsync(throwsOn: 5)
var iterator = sequences.joined().makeAsyncIterator()
let expected = [1, 2, 3, 4]
var actual = [Int]()
do {
while let item = try await iterator.next() {
actual.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(Failure(), error as? Failure)
}
XCTAssertEqual(expected, actual)
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_cancellation() async {
let source : AsyncSyncSequence<[AsyncSyncSequence<Indefinite<String>>]> = [Indefinite(value: "test").async].async
let sequence = source.joined()
let finished = expectation(description: "finished")
let iterated = expectation(description: "iterated")
let task = Task {
var firstIteration = false
for await el in sequence {
XCTAssertEqual(el, "test")
if !firstIteration {
firstIteration = true
iterated.fulfill()
}
}
finished.fulfill()
}
// ensure the other task actually starts
await fulfillment(of: [iterated], timeout: 1.0)
// cancellation should ensure the loop finishes
// without regards to the remaining underlying sequence
task.cancel()
await fulfillment(of: [finished], timeout: 1.0)
}
}
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