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
|
//===--------------- PredictableRandomNumberGeneratorTests.swift ----------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 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
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import XCTest
@_spi(Testing) import SwiftDriver
/// This generator is deterministic and platform independent, so the sequence for each seed should remain constant.
final class PredictableRandomNumberGeneratorTests: XCTestCase {
func testPredictability() {
var generator = PredictableRandomNumberGenerator(seed: 42)
XCTAssertEqual([generator.next(), generator.next(), generator.next(),
generator.next(), generator.next()],
[1546998764402558742, 6990951692964543102,
12544586762248559009, 17057574109182124193,
18295552978065317476])
var generator2 = PredictableRandomNumberGenerator(seed: 42)
XCTAssertEqual([generator2.next(), generator2.next(), generator2.next(),
generator2.next(), generator2.next()],
[1546998764402558742, 6990951692964543102,
12544586762248559009, 17057574109182124193,
18295552978065317476])
}
func testUnusualSeeds() {
var generator = PredictableRandomNumberGenerator(seed: 0)
XCTAssertEqual([generator.next(), generator.next(), generator.next(),
generator.next(), generator.next()],
[11091344671253066420, 13793997310169335082,
1900383378846508768, 7684712102626143532,
13521403990117723737])
var generator2 = PredictableRandomNumberGenerator(seed: 0xFFFFFFFFFFFFFFFF)
XCTAssertEqual([generator2.next(), generator2.next(), generator2.next(),
generator2.next(), generator2.next()],
[10328197420357168392, 14156678507024973869,
9357971779955476126, 13791585006304312367,
10463432026814718762])
}
}
|
