1 files changed, 12 insertions, 0 deletions
diff --git a/test/syntax_error.ml b/test/syntax_error.ml
index f65042a..5587908 100644
--- a/test/syntax_error.ml
+++ b/test/syntax_error.ml
@@ -248,6 +248,17 @@ let unclosed_act () =
          If there are nested blocks, the error will points the highest block.";
     }
 
+let unknown_operator () =
+  _test_instruction
+    {|
+    variable + = 1
+|}
+    {
+      level = Error;
+      loc = _position;
+      message = "Unknown operator. Did you write '+ =' instead of '+=' ?";
+    }
+
 let test =
   ( "Syntax Errors",
     [
@@ -268,4 +279,5 @@ let test =
       Alcotest.test_case "Misplaced if" `Quick misplaced_if;
       Alcotest.test_case "(()" `Quick unclosed_paren2;
       Alcotest.test_case "act: else" `Quick unclosed_act;
+      Alcotest.test_case "+ =" `Quick unknown_operator;
     ] )