#if canImport(Glibc)import Foundationimport Glibcimport Testing@testable import CodexBarCore struct AntigravityProcessLauncherLinuxTests {    @Test    func `pty launcher uses home and closes unrelated descriptors`() throws {        let tempDirectory = FileManager.default.temporaryDirectory            .appendingPathComponent("antigravity-spawn-\(UUID().uuidString)", isDirectory: true)        try FileManager.default.createDirectory(at: tempDirectory, withIntermediateDirectories: true)        defer { try? FileManager.default.removeItem(at: tempDirectory) }         let inheritedSourceFD = open("/dev/null", O_RDONLY)        guard inheritedSourceFD >= 0 else {            Issue.record("Failed to open descriptor fixture")            return        }        defer { close(inheritedSourceFD) }        let inheritedFD = fcntl(inheritedSourceFD, F_DUPFD, 200)        guard inheritedFD >= 200 else {            Issue.record("Failed to duplicate descriptor fixture")            return        }        defer { close(inheritedFD) }         let outputURL = tempDirectory.appendingPathComponent("result.txt")        let scriptURL = tempDirectory.appendingPathComponent("probe.sh")        let script = """        #!/bin/sh        pwd > \(outputURL.path)        if [ -e /proc/self/fd/\(inheritedFD) ]; then          echo inherited >> \(outputURL.path)        else          echo closed >> \(outputURL.path)        fi        """        // Direct writes close the executable before spawn; atomic replacement can race with exec on overlay filesystems.        try Data(script.utf8).write(to: scriptURL)        #expect(chmod(scriptURL.path, 0o700) == 0)         let handle = try AntigravityPTYProcessLauncher().launch(binary: scriptURL.path)        defer {            handle.killRoot()            handle.terminateTree(signal: SIGKILL, knownDescendants: [])            handle.closePTY()        }         for _ in 0..<200 where !FileManager.default.fileExists(atPath: outputURL.path) {            Thread.sleep(forTimeInterval: 0.01)        }        let lines = try String(contentsOf: outputURL, encoding: .utf8)            .split(separator: "\n")            .map(String.init)        #expect(lines == [NSHomeDirectory(), "closed"])    }}#endif