1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
//===----------------------------------------------------------------------===//
//
// 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 TestRemoveDuplicates: XCTestCase {
func test_removeDuplicates() async {
let source = [1, 2, 2, 2, 3, 4, 5, 6, 5, 5]
let expected = [1, 2, 3, 4, 5, 6, 5]
let sequence = source.async.removeDuplicates()
var actual = [Int]()
for await item in sequence {
actual.append(item)
}
XCTAssertEqual(actual, expected)
}
func test_removeDuplicates_with_closure() async {
let source = [1, 2.001, 2.005, 2.011, 3, 4, 5, 6, 5, 5]
let expected = [1, 2.001, 2.011, 3, 4, 5, 6, 5]
let sequence = source.async.removeDuplicates() { abs($0 - $1) < 0.01 }
var actual = [Double]()
for await item in sequence {
actual.append(item)
}
XCTAssertEqual(actual, expected)
}
func test_removeDuplicates_with_throwing_closure() async {
let source = [1, 2, 2, 2, 3, -1, 5, 6, 5, 5]
let expected = [1, 2, 3]
var actual = [Int]()
let sequence = source.async.removeDuplicates() { prev, next in
let next = try throwOn(-1, next)
return prev == next
}
do {
for try await item in sequence {
actual.append(item)
}
XCTFail()
} catch {
XCTAssertEqual(Failure(), error as? Failure)
}
XCTAssertEqual(actual, expected)
}
func test_removeDuplicates_with_throwing_upstream() async {
let source = [1, 2, 2, 2, 3, -1, 5, 6, 5, 5]
let expected = [1, 2, 3]
var actual = [Int]()
let throwingSequence = source.async.map ({
if $0 < 0 {
throw NSError(domain: NSCocoaErrorDomain, code: -1, userInfo: nil)
}
return $0
} as @Sendable (Int) throws -> Int)
do {
for try await item in throwingSequence.removeDuplicates() {
actual.append(item)
}
XCTFail()
} catch {
XCTAssertEqual((error as NSError).code, -1)
}
XCTAssertEqual(actual, expected)
}
func test_removeDuplicates_cancellation() async {
let source = Indefinite(value: "test")
let sequence = source.async.removeDuplicates()
let finished = expectation(description: "finished")
let iterated = expectation(description: "iterated")
let task = Task {
var firstIteration = false
for await _ in sequence {
if !firstIteration {
firstIteration = true
iterated.fulfill()
} else {
XCTFail("This sequence should only ever emit a single value")
}
}
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)
}
}
|
