XCTestが終わらなくなるやつ

CannotFinishXCTest.swift

import Foundation
import Combine

protocol NumberRepository: AnyObject {
    var numberPublisher: AnyPublisher<Int, Never> { get }
}

class Sample: ObservableObject {
    @Published var number: Int = 0
    private var cancellables = Set<AnyCancellable>()

    init(_ numberRepository: NumberRepository) {
        numberRepository.numberPublisher
            .sink { [weak self] number in
                self?.number = number
            }
            .store(in: &cancellables)
    }
}

class NumberRepositoryMock: NumberRepository {
    private let numberSubject = CurrentValueSubject<Int, Never>(0)
    var numberPublisher: AnyPublisher<Int, Never> {
        numberSubject.eraseToAnyPublisher()
    }
}

// TEST A
import Combine
import XCTest
@testable import Hoge

final class SampleATests: XCTestCase {
    private var cancellables = Set<AnyCancellable>()

    func testSampleA() throws {
        XCTContext.runActivity(named: "") { _ in
            let numberRepositoryMock = NumberRepositoryMock()
            let _ = Sample(numberRepositoryMock)
            let expectation = self.expectation(description: "sampleA")
            numberRepositoryMock.numberPublisher
                .sink { _ in
                    expectation.fulfill()
                }
                .store(in: &cancellables)
            self.wait(for: [expectation], timeout: 3)
        }
    }
}

// TEST B
import Combine
import XCTest
@testable import Hoge

final class SampleBTests: XCTestCase {
    private var cancellables = Set<AnyCancellable>()

    func testSampleB() throws {
        XCTContext.runActivity(named: "") { _ in
            let numberRepositoryMock = NumberRepositoryMock()
            let _ = Sample(numberRepositoryMock)
            let expectation = self.expectation(description: "sampleB")
            numberRepositoryMock.numberPublisher
                .sink { _ in
                    expectation.fulfill()
                }
                .store(in: &cancellables)
            self.wait(for: [expectation], timeout: 3)
        }
    }
}

Xcode 14.2、２つのMac (M1とM1 Pro)にて現象を確認