test(build): add tests for hash stability

Author: Taxrosdev

src/build/hash.rs

@@ -56,3 +56,48 @@ pub fn calc_build_hash(build_manifest_path: &Path, repo_path: &Path) -> Result<S
 
     Ok(hash.finalize().to_string())
 }
+
+#[cfg(test)]
+mod tests {
+    use std::path::PathBuf;
+    use temp_dir::TempDir;
+
+    use super::*;
+    use crate::repo::{Metadata, create_repo};
+
+    #[test]
+    fn test_build_hash_stability() {
+        let manifest = BuildManifest {
+            id: "test_package".into(),
+            aliases: Vec::new(),
+            metadata: Metadata {
+                description: None,
+                homepage_url: None,
+                title: None,
+                version: None,
+                license: None,
+            },
+            commands: Vec::new(),
+            directory: PathBuf::from("."),
+            edition: "2025".into(),
+            build_script: None,
+            post_script: None,
+            sources: None,
+            include: None,
+            sdks: None,
+            env: None,
+        };
+
+        let repo = TempDir::new().unwrap();
+        create_repo(repo.path(), None).unwrap();
+
+        let manifest_path = repo.path().join("build_manifest.yml");
+
+        fs::write(&manifest_path, serde_yaml::to_string(&manifest).unwrap()).unwrap();
+
+        let known_hash = "680cec2b6b847e76d733fb435214b18ec2108e25b4dfc54695f5daa1e987ec8d";
+        let calc_hash = calc_build_hash(&manifest_path, repo.path()).unwrap();
+
+        assert_eq!(known_hash, calc_hash);
+    }
+}