Attempt linux test

.github/workflows/ci.yml

@@ -7,11 +7,12 @@ on:
     paths-ignore:
       - 'README.md'
       - 'CODE_OF_CONDUCT.md'
+      - '.editorconfig'
+      - '.spi.yml'
   pull_request:
     branches:
       - main
 
-
 env:
   DEVELOPER_DIR: /Applications/Xcode_15.0.app/Contents/Developer
 
@@ -27,5 +28,20 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+      - name: Install XCBeautify
+        run: brew install xcbeautify
       - name: Test platform ${{ matrix.destination }}
-        run: set -o pipefail && xcodebuild -scheme Queue -destination "${{ matrix.destination }}" test | xcpretty
+        run: set -o pipefail && xcodebuild -scheme Queue -destination "${{ matrix.destination }}" test | xcbeautify --renderer github-actions
+
+  linux_test:
+    name: Test Linux
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install swiftly
+        run: curl -L https://swift-server.github.io/swiftly/swiftly-install.sh | bash -s -- -y
+      - name: Install the latest Swift toolchain
+        run: swiftly install latest
+      - name: Test
+        run: swift test

Tests/QueueTests/XCTest+Fulfillment.swift

@@ -0,0 +1,38 @@
+// see https://github.com/apple/swift-corelibs-xctest/issues/436
+
+import Foundation
+
+#if os(Linux)
+import XCTest
+
+extension XCTestCase {
+	/// Wait on an array of expectations for up to the specified timeout, and optionally specify whether they
+	/// must be fulfilled in the given order. May return early based on fulfillment of the waited on expectations.
+	///
+	/// - Parameter expectations: The expectations to wait on.
+	/// - Parameter timeout: The maximum total time duration to wait on all expectations.
+	/// - Parameter enforceOrder: Specifies whether the expectations must be fulfilled in the order
+	///   they are specified in the `expectations` Array. Default is false.
+	/// - Parameter file: The file name to use in the error message if
+	///   expectations are not fulfilled before the given timeout. Default is the file
+	///   containing the call to this method. It is rare to provide this
+	///   parameter when calling this method.
+	/// - Parameter line: The line number to use in the error message if the
+	///   expectations are not fulfilled before the given timeout. Default is the line
+	///   number of the call to this method in the calling file. It is rare to
+	///   provide this parameter when calling this method.
+	///
+	/// - SeeAlso: XCTWaiter
+	func fulfillment(of expectations: [XCTestExpectation], timeout: TimeInterval, enforceOrder: Bool = false) async {
+		return await withCheckedContinuation { continuation in
+			// This function operates by blocking a background thread instead of one owned by libdispatch or by the
+			// Swift runtime (as used by Swift concurrency.) To ensure we use a thread owned by neither subsystem, use
+			// Foundation's Thread.detachNewThread(_:).
+			Thread.detachNewThread { [self] in
+				wait(for: expectations, timeout: timeout, enforceOrder: enforceOrder)
+				continuation.resume()
+			}
+		}
+	}
+}
+#endif