diff --git a/crates/erg_parser/tests/parse_test.rs b/crates/erg_parser/tests/parse_test.rs
index 8b780a36..a15be423 100644
--- a/crates/erg_parser/tests/parse_test.rs
+++ b/crates/erg_parser/tests/parse_test.rs
@@ -84,6 +84,11 @@ fn parse_invalid_class_definition() -> Result<(), ()> {
     expect_failure("tests/invalid_class_definition.er", 0, 7)
 }
 
+#[test]
+fn parse_missing_paren() -> Result<(), ()> {
+    expect_failure("tests/missing_paren.er", 0, 1)
+}
+
 #[test]
 fn parse_warns() -> Result<(), ()> {
     expect_success("tests/warns.er", 1)
diff --git a/crates/erg_parser/tests/unmatched_paren.er b/crates/erg_parser/tests/unmatched_paren.er
new file mode 100644
index 00000000..fdcb1043
--- /dev/null
+++ b/crates/erg_parser/tests/unmatched_paren.er
@@ -0,0 +1 @@
+func a, b) = a + b
\ No newline at end of file