diff --git a/compiler/erg_parser/tests/multi_line_str_literal.er b/compiler/erg_parser/tests/multi_line_str_literal.er
index 9bf560d2..e6ff96c9 100644
--- a/compiler/erg_parser/tests/multi_line_str_literal.er
+++ b/compiler/erg_parser/tests/multi_line_str_literal.er
@@ -26,4 +26,15 @@ complex_string = """\\\
 \t\0\
 \r\n\
 \\"""
-print! complex_string
\ No newline at end of file
+print! complex_string
+
+quotation_mark = """\"\"\""""
+print! quotation_mark
+
+quotation_marks = """"
+""
+""\"
+\"\"\"""
+\"\""
+\"\"\""""
+print! quotation_marks
\ No newline at end of file
diff --git a/compiler/erg_parser/tests/tokenize_test.rs b/compiler/erg_parser/tests/tokenize_test.rs
index 70a56079..c87f51ac 100644
--- a/compiler/erg_parser/tests/tokenize_test.rs
+++ b/compiler/erg_parser/tests/tokenize_test.rs
@@ -367,6 +367,30 @@ line break\"\"\"",
         (Newline, newline),
         (Symbol, "print!"),
         (Symbol, "complex_string"),
+        (Newline, newline),
+        (Newline, newline),
+        (Symbol, "quotation_mark"),
+        (Equal, "="),
+        (StrLit, "\"\"\"\"\"\"\"\"\""),
+        (Newline, newline),
+        (Symbol, "print!"),
+        (Symbol, "quotation_mark"),
+        (Newline, newline),
+        (Newline, newline),
+        (Symbol, "quotation_marks"),
+        (Equal, "="),
+        (
+            StrLit,
+            "\"\"\"\"
+\"\"
+\"\"\"
+\"\"\"\"\"
+\"\"\"
+\"\"\"\"\"\"",
+        ),
+        (Newline, newline),
+        (Symbol, "print!"),
+        (Symbol, "quotation_marks"),
         (EOF, ""),
     ];
     let mut tok: Token;