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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
final class TestReductions: XCTestCase {
func test_reductions() async {
let sequence = [1, 2, 3, 4].async.reductions("") { partial, value in
partial + "\(value)"
}
var iterator = sequence.makeAsyncIterator()
var collected = [String]()
while let item = await iterator.next() {
collected.append(item)
}
XCTAssertEqual(collected, ["1", "12", "123", "1234"])
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_inclusive_reductions() async {
let sequence = [1, 2, 3, 4].async.reductions { $0 + $1 }
var iterator = sequence.makeAsyncIterator()
var collected = [Int]()
while let item = await iterator.next() {
collected.append(item)
}
XCTAssertEqual(collected, [1, 3, 6, 10])
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throw_upstream_reductions() async throws {
let sequence = [1, 2, 3, 4].async
.map { try throwOn(3, $0) }
.reductions("") { partial, value in
partial + "\(value)"
}
var iterator = sequence.makeAsyncIterator()
var collected = [String]()
do {
while let item = try await iterator.next() {
collected.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(error as? Failure, Failure())
}
XCTAssertEqual(collected, ["1", "12"])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throw_upstream_inclusive_reductions() async throws {
let sequence = [1, 2, 3, 4].async
.map { try throwOn(3, $0) }
.reductions { $0 + $1 }
var iterator = sequence.makeAsyncIterator()
var collected = [Int]()
do {
while let item = try await iterator.next() {
collected.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(error as? Failure, Failure())
}
XCTAssertEqual(collected, [1, 3])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throwing_reductions() async throws {
let sequence = [1, 2, 3, 4].async.reductions("") { (partial, value) throws -> String in
partial + "\(value)"
}
var iterator = sequence.makeAsyncIterator()
var collected = [String]()
while let item = try await iterator.next() {
collected.append(item)
}
XCTAssertEqual(collected, ["1", "12", "123", "1234"])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throwing_inclusive_reductions() async throws {
let sequence = [1, 2, 3, 4].async.reductions { (lhs, rhs) throws -> Int in
lhs + rhs
}
var iterator = sequence.makeAsyncIterator()
var collected = [Int]()
while let item = try await iterator.next() {
collected.append(item)
}
XCTAssertEqual(collected, [1, 3, 6, 10])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throw_upstream_reductions_throws() async throws {
let sequence = [1, 2, 3, 4].async
.map { try throwOn(3, $0) }
.reductions("") { (partial, value) throws -> String in
partial + "\(value)"
}
var iterator = sequence.makeAsyncIterator()
var collected = [String]()
do {
while let item = try await iterator.next() {
collected.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(error as? Failure, Failure())
}
XCTAssertEqual(collected, ["1", "12"])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throw_upstream_inclusive_reductions_throws() async throws {
let sequence = [1, 2, 3, 4].async
.map { try throwOn(3, $0) }
.reductions { (lhs, rhs) throws -> Int in
lhs + rhs
}
var iterator = sequence.makeAsyncIterator()
var collected = [Int]()
do {
while let item = try await iterator.next() {
collected.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(error as? Failure, Failure())
}
XCTAssertEqual(collected, [1, 3])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_reductions_into() async {
let sequence = [1, 2, 3, 4].async.reductions(into: "") { partial, value in
partial.append("\(value)")
}
var iterator = sequence.makeAsyncIterator()
var collected = [String]()
while let item = await iterator.next() {
collected.append(item)
}
XCTAssertEqual(collected, ["1", "12", "123", "1234"])
let pastEnd = await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throwing_reductions_into() async throws {
let sequence = [1, 2, 3, 4].async.reductions(into: "") { (partial, value) throws -> Void in
partial.append("\(value)")
}
var iterator = sequence.makeAsyncIterator()
var collected = [String]()
while let item = try await iterator.next() {
collected.append(item)
}
XCTAssertEqual(collected, ["1", "12", "123", "1234"])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_throwing_reductions_into_throws() async throws {
let sequence = [1, 2, 3, 4].async.reductions(into: "") { partial, value in
_ = try throwOn("12", partial)
partial.append("\(value)")
}
var iterator = sequence.makeAsyncIterator()
var collected = [String]()
do {
while let item = try await iterator.next() {
collected.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(error as? Failure, Failure())
}
XCTAssertEqual(collected, ["1", "12"])
let pastEnd = try await iterator.next()
XCTAssertNil(pastEnd)
}
func test_cancellation() async {
let source = Indefinite(value: "test")
let sequence = source.async.reductions(into: "") { partial, value in
partial = value
}
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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