diff --git a/test/corpus/expr.txt b/test/corpus/expr.txt
index ccdd543..23288e2 100644
--- a/test/corpus/expr.txt
+++ b/test/corpus/expr.txt
@@ -27,6 +27,22 @@ unary expression
   (unary_operator
     (integer)))
 
+================================================================================
+Index expression
+================================================================================
+
+"abc"[1]
+
+--------------------------------------------------------------------------------
+
+(module
+  (subscript
+    (string
+      (string_start)
+      (string_content)
+      (string_end))
+    (integer)))
+
 ================================================================================
 slice expression
 ================================================================================
diff --git a/test/corpus/literal.txt b/test/corpus/literal.txt
index 5c9b9db..1809528 100644
--- a/test/corpus/literal.txt
+++ b/test/corpus/literal.txt
@@ -38,6 +38,37 @@ r"Hi\nHello"
     (string_content)
     (string_end)))
 
+================================================================================
+Documented String
+================================================================================
+
+schema Person:
+    """
+    Person schema doc string
+    """
+
+    name: str = "Alice"
+
+--------------------------------------------------------------------------------
+
+(module
+  (schema_statement
+    (identifier)
+    (block
+      (string
+        (string_start)
+        (string_content)
+        (string_end))
+      (assignment
+        (dotted_name
+          (identifier))
+        (type
+          (basic_type))
+        (string
+          (string_start)
+          (string_content)
+          (string_end))))))
+
 ================================================================================
 number
 ================================================================================