Linux support

.github/workflows/ci.yml

@@ -14,3 +14,6 @@ permissions:
 jobs:
   call-workflow:
     uses: skiptools/actions/.github/workflows/skip-framework.yml@v1
+    with:
+      runs-on: "['macos-13', 'ubuntu-24.04']"
+

Tests/SkipFoundationTests/CoreLibs/TestDecimal.swift

@@ -3,7 +3,7 @@
 import Foundation
 import XCTest
 
-#if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size
+#if !SKIP && canImport(Darwin) // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:
 

Tests/SkipFoundationTests/Formats/TestAttributedString.swift

@@ -3,7 +3,7 @@
 import Foundation
 import XCTest
 
-#if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size
+#if !SKIP && canImport(Darwin) // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:
 

Tests/SkipFoundationTests/Formats/TestAttributedStringPerformance.swift

@@ -3,7 +3,7 @@
 import Foundation
 import XCTest
 
-#if !SKIP
+#if canImport(Darwin)
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:
 
 //===----------------------------------------------------------------------===//

Tests/SkipFoundationTests/Formats/TestXMLDocument.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationXML)
+import FoundationXML
+#endif
 import XCTest
 
 #if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size

Tests/SkipFoundationTests/Formats/TestXMLParser.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationXML)
+import FoundationXML
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Formatters/TestRelativeDateTimeFormatter.swift

@@ -3,6 +3,8 @@
 import Foundation
 import XCTest
 
+#if SKIP || canImport(Darwin)
+
 fileprivate typealias CaseRelativeFormat = (numericFull: String, namedShort: String, namedAbbreviated: String, dateComponents: DateComponents, timeInterval: TimeInterval)
 
 /// Kotlin formats time intervals approaching/at 0 as "x ago"
@@ -297,3 +299,5 @@ class TestRelativeDateTimeFormatter: XCTestCase {
         return (timeInterval, components, formattedString)
     }
 }
+
+#endif

Tests/SkipFoundationTests/Foundation/BundleTests.swift

@@ -1,19 +1,16 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
-import OSLog
 import XCTest
 
 @available(macOS 13, iOS 16, watchOS 10, tvOS 16, *)
 final class BundleTests: XCTestCase {
-    let logger: Logger = Logger(subsystem: "test", category: "BundleTests")
-
     func testBundle() throws {
         // Swift will be: Contents/Resources/ -- file:///~/Library/Developer/Xcode/DerivedData/DemoApp-ABCDEF/Build/Products/Debug/SkipFoundationTests.xctest/Contents/Resources/Skip_SkipFoundationTests.bundle/
         // Kotlin will be: file:///~/Library/Developer/Xcode/DerivedData/DemoApp-ABCDEF/Build/Products/Debug/SkipFoundationTests.xctest/Contents/Resources/skip-foundation_SkipFoundationTests.bundle/Contents/Resources/textasset.txt
 
         let resourceURL: URL = try XCTUnwrap(Bundle.module.url(forResource: "textasset", withExtension: "txt", subdirectory: nil, localization: nil))
-        logger.info("resourceURL: \(resourceURL.absoluteString)")
+        //logger.info("resourceURL: \(resourceURL.absoluteString)")
         let str = try String(contentsOf: resourceURL)
         XCTAssertEqual("Some text\n", str)
     }

Tests/SkipFoundationTests/Foundation/DateTests.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(CoreFoundation)
+import CoreFoundation // for CFAbsoluteTimeGetCurrent()
+#endif
 import XCTest
 
 @available(macOS 12, iOS 15, tvOS 15, watchOS 8, *)

Tests/SkipFoundationTests/Foundation/DigestTests.swift

@@ -13,6 +13,7 @@ extension Data {
 }
 #endif
 
+#if SKIP || canImport(CryptoKit) // i.e., not Linux
 @available(macOS 11, iOS 14, watchOS 7, tvOS 14, *)
 final class DigestTests: XCTestCase {
     func testSHA256() {
@@ -93,4 +94,5 @@ final class DigestTests: XCTestCase {
         XCTAssertEqual("TrfwQeSZQ8gTfY7U+NQY+CDxexfk6hHVDJ2pevtMM2OXmxY9X/60uWhsXnMym1+vzg7XGgO729yGQgsPdAY19A==", Data(HMACSHA512.authenticationCode(for: Data("Your message to sign".utf8), using: SymmetricKey(data: Data("your-secret-key".utf8)))).base64EncodedString())
     }
 }
+#endif
 

Tests/SkipFoundationTests/Foundation/JSONTests.swift

@@ -1,13 +1,10 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
-import OSLog
 import XCTest
 import Foundation
 
 @available(macOS 11, iOS 14, watchOS 7, tvOS 14, *)
 class TestJSON : XCTestCase {
-    fileprivate let logger: Logger = Logger(subsystem: "test", category: "TestJSON")
-
     struct StringField : Equatable, Codable {
         var stringField: String
     }

Tests/SkipFoundationTests/Foundation/LocaleTests.swift

@@ -3,6 +3,8 @@
 import Foundation
 import XCTest
 
+#if SKIP || canImport(Darwin)
+
 @available(macOS 13, iOS 16, watchOS 10, tvOS 16, *)
 final class LocaleTests: XCTestCase {
     func testLanguageCodes() throws {
@@ -1051,3 +1053,5 @@ let xcstringsSample = """
 }
 
 """
+#endif
+

Tests/SkipFoundationTests/Foundation/LoggerTests.swift

@@ -1,5 +1,6 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
+#if SKIP || canImport(OSLog)
 import OSLog
 import XCTest
 
@@ -24,3 +25,4 @@ final class LoggerTests: XCTestCase {
         logger.error("logger error test")
     }
 }
+#endif

Tests/SkipFoundationTests/Network/TestCachedURLResponse.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestDataURLProtocol.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestHTTPCookie.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 #if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size

Tests/SkipFoundationTests/Network/TestHTTPCookieStorage.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 #if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size

Tests/SkipFoundationTests/Network/TestHTTPURLResponse.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestHost.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestSocketPort.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 #if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size

Tests/SkipFoundationTests/Network/TestURL.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // TODO: remove '// API marked unavailable for Skip:' portions as we make more API available

Tests/SkipFoundationTests/Network/TestURLCache.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 #if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size

Tests/SkipFoundationTests/Network/TestURLComponents.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestURLCredential.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestURLCredentialStorage.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 #if !SKIP // disabled for to reduce test count and avoid io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: gRPC message exceeds maximum size

Tests/SkipFoundationTests/Network/TestURLProtectionSpace.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestURLRequest.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestURLResponse.swift

@@ -1,6 +1,9 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
 // These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/Network/TestURLSession.swift

@@ -1,22 +1,28 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import XCTest
 
+#if SKIP || canImport(Darwin) // many of these tests don't build for Linux
 class TestURLSession: XCTestCase {
     func testDefaultURLSessionConfiguration() {
         let config = URLSessionConfiguration.default
         XCTAssertEqual(nil, config.identifier)
         XCTAssertEqual(60.0, config.timeoutIntervalForRequest)
         XCTAssertEqual(604800.0, config.timeoutIntervalForResource)
         XCTAssertEqual(true, config.allowsCellularAccess)
+        #if !os(Linux)
         //XCTAssertEqual(true, config.allowsExpensiveNetworkAccess)
         XCTAssertEqual(true, config.allowsConstrainedNetworkAccess)
         XCTAssertEqual(false, config.waitsForConnectivity)
         XCTAssertEqual(false, config.isDiscretionary)
         XCTAssertEqual(nil, config.sharedContainerIdentifier)
         XCTAssertEqual(false, config.sessionSendsLaunchEvents)
         //XCTAssertEqual(nil, config.connectionProxyDictionary)
+        #endif
         XCTAssertEqual(false, config.httpShouldUsePipelining)
         XCTAssertEqual(true, config.httpShouldSetCookies)
         //XCTAssertEqual(nil, config.httpAdditionalHeaders)
@@ -270,6 +276,7 @@ class TestURLSession: XCTestCase {
         }
     }
 }
+#endif
 
 //
 //// These tests are adapted from https://github.com/apple/swift-corelibs-foundation/blob/main/Tests/Foundation/Tests which have the following license:

Tests/SkipFoundationTests/SkipFoundationTests.swift

@@ -1,15 +1,19 @@
 // Copyright 2023–2025 Skip
 // SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
 import Foundation
+#if SKIP || canImport(OSLog)
 import OSLog
+#endif
 import XCTest
 #if !SKIP
 @testable import func SkipFoundation.SkipFoundationInternalModuleName
 @testable import func SkipFoundation.SkipFoundationPublicModuleName
 #endif
 
 final class SkipFoundationTests: XCTestCase {
+    #if SKIP || canImport(OSLog)
     let logger: Logger = Logger(subsystem: "test", category: "SkipFoundationTests")
+    #endif
 
     func testSkipFoundation() throws {
         XCTAssertEqual(3, 1 + 2)
@@ -25,7 +29,9 @@ final class SkipFoundationTests: XCTestCase {
             if isRobolectric {
                 XCTAssertEqual(value, env[key], "Unexpected value for Robolectric system property \(key): \(env[key] ?? "")")
             } else if isAndroidEmulator {
+                #if SKIP || canImport(OSLog)
                 logger.log("ANDROID ENV: \(key)=\(env[key] ?? "")")
+                #endif
                 XCTAssertNotNil(env[key], "Android system property should not been nil for key \(key)")
             } else {
                 XCTAssertNil(env[key], "Swift system property should have been nil for key \(key) value=\(env[key] ?? "")")

Tests/SkipFoundationTests/System/TestNotificationCenter.swift

@@ -133,6 +133,8 @@ class TestNotificationCenter : XCTestCase {
         XCTAssertTrue(flag)
     }
 
+    #if SKIP || canImport(Darwin) // i.e., not Linux
+
     func test_notificationsSequence() async {
         let notificationCenter = NotificationCenter()
         let notificationName = Notification.Name(rawValue: "test_notificationsSequence_name")
@@ -176,6 +178,8 @@ class TestNotificationCenter : XCTestCase {
         XCTAssertEqual(count, 2)
     }
 
+    #endif // SKIP || canImport(Darwin) // i.e., not Linux
+
     func test_observeOnPostingQueue() {
         #if SKIP
         throw XCTSkip("TODO")