From 466fb7fe4d5a3aae896444ab718dfdee8b24fbcb Mon Sep 17 00:00:00 2001
From: Marceline Cramer <cramermarceline@gmail.com>
Date: Thu, 30 Apr 2026 19:57:47 -0600
Subject: [PATCH] Assert tree-sitter validity in each AST test

---
 crates/frontend/src/workspace.rs | 16 ++++++++++++++++
 crates/frontend/tests/ast.rs     |  6 ++++++
 2 files changed, 22 insertions(+)

diff --git a/crates/frontend/src/workspace.rs b/crates/frontend/src/workspace.rs
index fc59a44..8797577 100644
--- a/crates/frontend/src/workspace.rs
+++ b/crates/frontend/src/workspace.rs
@@ -321,3 +321,19 @@ pub fn ast_syntax_errors(db: &dyn Database, ast: AstNode) {
             .for_each(|child| ast_syntax_errors(db, *child));
     }
 }
+
+#[salsa::tracked]
+pub fn file_has_syntax_error(db: &dyn Database, file: File) -> bool {
+    ast_has_syntax_error(db, file.ast(db))
+}
+
+#[salsa::tracked]
+pub fn ast_has_syntax_error(db: &dyn Database, ast: AstNode) -> bool {
+    if ast.symbol(db) == "ERROR" {
+        true
+    } else {
+        ast.children(db)
+            .iter()
+            .any(|ast| ast_has_syntax_error(db, *ast))
+    }
+}
diff --git a/crates/frontend/tests/ast.rs b/crates/frontend/tests/ast.rs
index 0659e3a..193d8c2 100644
--- a/crates/frontend/tests/ast.rs
+++ b/crates/frontend/tests/ast.rs
@@ -38,6 +38,12 @@ fn test_ast(path: &Path) -> datatest_stable::Result<()> {
     let uri = lsp_types::Url::from_file_path(&path).unwrap();
     let ed = Editor::new(&mut db, workspace, uri, &src);
 
+    // ensure tree-sitter has fully parsed
+    assert!(
+        !workspace::file_has_syntax_error(&db, ed.get_file()),
+        "test has syntax error"
+    );
+
     // list and parse top-level items
     ast::items(&db, ed.get_file()).into_iter().for_each(|meta| {
         ast::item(&db, meta);