When writing an updated package manifest in tests fails, try again

Package resolving can open Package.swift in exclusive mode on Windows, which prevents us from writing the new package manifest. Keep retrying until we get a successful write. This matches what a user would do.

Author: ahoppen

Tests/SourceKitLSPTests/WorkspaceTests.swift

@@ -585,12 +585,22 @@ final class WorkspaceTests: XCTestCase {
     let packageBManifestPath = project.scratchDirectory
       .appendingPathComponent("PackageB")
       .appendingPathComponent("Package.swift")
-    try newPackageManifest.write(
-      to: packageBManifestPath,
-      atomically: true,
-      encoding: .utf8
-    )
 
+    // Package resolving can open Package.swift in exclusive mode on Windows, which prevents us from writing the new
+    // package manifest. Keep retrying until we get a successful write. This matches what a user would do.
+    try await repeatUntilExpectedResult {
+      do {
+        try newPackageManifest.write(
+          to: packageBManifestPath,
+          atomically: true,
+          encoding: .utf8
+        )
+        return true
+      } catch {
+        logger.error("Writing new package manifest failed, will retry: \(error.forLogging)")
+        return false
+      }
+    }
     project.testClient.send(
       DidChangeWatchedFilesNotification(changes: [
         FileEvent(uri: DocumentURI(packageBManifestPath), type: .changed)