fatalError "Couldn't load snapshot from disk" when using assertInlineSnapshot

[morstin]

I assume this must be a very simple oversight from me side, but I could not get a clue:

• when using assertInlineSnapshot the library wants to write into the test souce file
• this access seems to go wrong and I get to below fatalError("Couldn't load snapshot from disk", file: file.path, line: line)
• the test runs fine - I can see already the diffing pop up in the editor

Any ideas where I would need to enable that the library has access to write into the test source file?

private func writeInlineSnapshots() {
   defer { inlineSnapshotState.removeAll() }
   for (file, snapshots) in inlineSnapshotState {
     let line = snapshots.first?.line ?? 1
     guard let testSource = try? testSource(file: file)
     else {
       fatalError("Couldn't load snapshot from disk", file: file.path, line: line)
     }

Messages in Xcode Console

CLIENT: Failure to determine if this machine is in the process of shutting down, err=1/Operation not permitted

LSPrefs: could not find untranslocated node for <FSNode 0x600000193fa0> { isDir = ?, path = '/private/var/folders/yc/63qbpnfn3kvbr83jgw1_vsg80000gn/X/CF5C6211-778E-5B81-B8E2-5D760ECE4397/d/Wrapper/xxx-xxx.app' }, proceeding on the assumption it is not translocated: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"

Invalid connection: com.apple.coresymbolicationd
/path-to-file/File_Tests.swift:16: Fatal error: Couldn't load snapshot from disk