File: UtilitiesTests.swift

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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2021 - 2024 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

#if !COLLECTIONS_SINGLE_MODULE && DEBUG
@testable import _CollectionsTestSupport
#endif

#if COLLECTIONS_SINGLE_MODULE || DEBUG
final class UtilitiesTests: CollectionTestCase {
  func testIntegerSquareRoot() {
    withSome("i", in: 0 ..< Int.max, maxSamples: 100_000) { i in
      let s = i._squareRoot()
      expectLessThanOrEqual(s * s, i)
      let next = (s + 1).multipliedReportingOverflow(by: s + 1)
      if !next.overflow {
        expectGreaterThan(next.partialValue, i)
      }
    }
  }
}
#endif