test(core): add lookup-by-gitlab_project_id test for projects table

Validates that the projects table schema uses gitlab_project_id (not
gitlab_id) and that queries filtering by this column return the correct
project. Uses the test helper convention where insert_project sets
gitlab_project_id = id * 100.

src/core/project_tests.rs

@@ -154,3 +154,25 @@ fn test_percent_not_wildcard() {
     let id = resolve_project(&conn, "a%b").unwrap();
     assert_eq!(id, 1);
 }
+
+#[test]
+fn test_lookup_by_gitlab_project_id() {
+    use crate::test_support::{insert_project as insert_proj, setup_test_db};
+
+    let conn = setup_test_db();
+    insert_proj(&conn, 1, "team/alpha");
+    insert_proj(&conn, 2, "team/beta");
+
+    // insert_project sets gitlab_project_id = id * 100
+    let path: String = conn
+        .query_row(
+            "SELECT path_with_namespace FROM projects
+             WHERE gitlab_project_id = ?1
+             ORDER BY id LIMIT 1",
+            rusqlite::params![200_i64],
+            |row| row.get(0),
+        )
+        .unwrap();
+
+    assert_eq!(path, "team/beta");
+}