add more unit tests

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/tests/change_tracker.rs

@@ -0,0 +1,10 @@
+use crate::{find_recent_config_change_ids, CONFIG_CHANGE_HISTORY};
+
+#[test]
+fn test_find_recent_config_change_ids() {
+    // If change-id is greater than the most recent one, result should be empty.
+    assert!(find_recent_config_change_ids(usize::MAX).is_empty());
+
+    // There is no change-id equal to or less than 0, result should include the entire change history.
+    assert_eq!(find_recent_config_change_ids(0).len(), CONFIG_CHANGE_HISTORY.len());
+}

src/bootstrap/src/tests/helpers.rs

@@ -1,5 +1,14 @@
-use crate::utils::helpers::{check_cfg_arg, extract_beta_rev, hex_encode, make};
-use std::path::PathBuf;
+use crate::{
+    utils::helpers::{
+        check_cfg_arg, extract_beta_rev, hex_encode, make, program_out_of_date, symlink_dir,
+    },
+    Config,
+};
+use std::{
+    fs::{self, remove_file, File},
+    io::Write,
+    path::PathBuf,
+};
 
 #[test]
 fn test_make() {
@@ -70,3 +79,34 @@ fn test_check_cfg_arg() {
         "--check-cfg=cfg(target_os,values(\"nixos\",\"nix2\"))"
     );
 }
+
+#[test]
+fn test_program_out_of_date() {
+    let config = Config::parse(&["check".to_owned(), "--config=/does/not/exist".to_owned()]);
+    let tempfile = config.tempdir().join(".tmp-stamp-file");
+    File::create(&tempfile).unwrap().write_all(b"dummy value").unwrap();
+    assert!(tempfile.exists());
+
+    // up-to-date
+    assert!(!program_out_of_date(&tempfile, "dummy value"));
+    // out-of-date
+    assert!(program_out_of_date(&tempfile, ""));
+
+    remove_file(tempfile).unwrap();
+}
+
+#[test]
+fn test_symlink_dir() {
+    let config = Config::parse(&["check".to_owned(), "--config=/does/not/exist".to_owned()]);
+    let tempdir = config.tempdir().join(".tmp-dir");
+    let link_path = config.tempdir().join(".tmp-link");
+
+    fs::create_dir_all(&tempdir).unwrap();
+    symlink_dir(&config, &tempdir, &link_path).unwrap();
+
+    let link_source = fs::read_link(&link_path).unwrap();
+    assert_eq!(link_source, tempdir);
+
+    fs::remove_dir(tempdir).unwrap();
+    fs::remove_file(link_path).unwrap();
+}

src/bootstrap/src/utils/change_tracker.rs

@@ -2,6 +2,10 @@
 //! with the goal of keeping developers synchronized with important modifications in
 //! the bootstrap.
 
+#[cfg(test)]
+#[path = "../tests/change_tracker.rs"]
+mod tests;
+
 #[derive(Clone, Debug)]
 pub struct ChangeInfo {
     /// Represents the ID of PR caused major change on bootstrap.