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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 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
//
//===----------------------------------------------------------------------===//
#if canImport(TestSupport)
import TestSupport
#endif
#if FOUNDATION_FRAMEWORK
@testable import Foundation
#elseif canImport(FoundationInternationalization)
@testable import FoundationInternationalization
#endif // FOUNDATION_FRAMEWORK
final class LockedStateTests : XCTestCase {
final class TestObject {}
struct TestError: Error {}
func testWithLockDoesNotExtendLifetimeOfState() {
weak var state: TestObject?
let lockedState: LockedState<TestObject>
(state, lockedState) = {
let state = TestObject()
return (state, LockedState(initialState: state))
}()
lockedState.withLock { state in
weak var oldState = state
state = TestObject()
XCTAssertNil(oldState, "State object lifetime was extended after reassignment within body")
}
XCTAssertNil(state, "State object lifetime was extended beyond end of call")
}
func testWithLockExtendingLifespanDoesExtendLifetimeOfState() {
weak var state: TestObject?
let lockedState: LockedState<TestObject>
(state, lockedState) = {
let state = TestObject()
return (state, LockedState(initialState: state))
}()
lockedState.withLockExtendingLifetimeOfState { state in
weak var oldState = state
state = TestObject()
XCTAssertNotNil(oldState, "State object lifetime was not extended after reassignment within body")
}
XCTAssertNil(state, "State object lifetime was extended beyond end of call")
}
func testWithLockExtendingLifespanReleasesLockWhenBodyThrows() {
let lockedState = LockedState(initialState: TestObject())
XCTAssertThrowsError(
try lockedState.withLockExtendingLifetimeOfState { _ in
throw TestError()
},
"The body was expected to throw an error, but it did not."
)
// ⚠️ This test fails by crashing. If the lock was not properly released by the
// `withLockExtendingLifetimeOfState()` call above, the following `withLock()`
// call will abort the program.
lockedState.withLock { _ in
// PASS
}
}
}
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