Add test for file metadata handling with extreme values

Author: Byron

gix-index/tests/fixtures/file_metadata.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -eu -o pipefail
+
+# The largest-possible date for Ext4, nanos are special there, but ont usually on other filesystems
+touch -d "2446-05-10 22:38:55.111111111" future
+# The smallest-possible date for Ext4, nanos are special there, but ont usually on other filesystems
+touch -d "1901-12-13 20:45:52.222222222" past

gix-index/tests/fixtures/generated-archives/.gitignore

@@ -0,0 +1 @@
+file_metadata.tar.xz

gix-index/tests/index/fs.rs

@@ -0,0 +1,18 @@
+mod metadata {
+    use gix_index::fs::Metadata;
+
+    #[test]
+    fn from_path_no_follow() -> crate::Result {
+        let root = gix_testtools::scripted_fixture_read_only_standalone("file_metadata.sh")?;
+
+        // For now, don't assert on the values of the metadata as these depends on the filesystem,
+        // which might truncate it, or fail entirely.
+        for filename in ["future", "past"] {
+            let meta = Metadata::from_path_no_follow(&root.join(filename))?;
+            assert!(meta.created().is_some());
+            assert!(meta.modified().is_some());
+            assert_eq!(meta.len(), 0);
+        }
+        Ok(())
+    }
+}

gix-index/tests/index/mod.rs

@@ -5,6 +5,7 @@ use gix_hash::ObjectId;
 mod access;
 mod entry;
 mod file;
+mod fs;
 mod init;
 
 pub fn hex_to_id(hex: &str) -> ObjectId {