diff --git a/testing/alter_table.test b/testing/alter_table.test
index e9e83c403..c7eac8c9f 100755
--- a/testing/alter_table.test
+++ b/testing/alter_table.test
@@ -133,6 +133,29 @@ do_execsql_test_in_memory_any_error fail-alter-table-drop-unique-column-constrai
     ALTER TABLE t DROP b;
 }
 
+
+# refer https://github.com/tursodatabase/turso/issues/3231
+do_execsql_test_in_memory_any_error fail-alter-table-add-duplicate-column {
+    CREATE TABLE t1 (a);
+    ALTER TABLE t1 ADD COLUMN a;
+}
+do_execsql_test_in_memory_any_error fail-alter-table-add-duplicate-column-case-insensitive {
+    CREATE TABLE t1 (a);
+    ALTER TABLE t1 ADD COLUMN A;
+}
+do_execsql_test_on_specific_db {:memory:} alter-table-add-column-type-should-be-same {
+    CREATE TABLE t1 (id integer);
+    ALTER TABLE t1 ADD COLUMN name varchar(255);
+    SELECT sql FROM sqlite_schema WHERE name = 't1';
+} { "CREATE TABLE t1 (id integer, name varchar (255))" }
+
+do_execsql_test_on_specific_db {:memory:} alter-table-add-column-type-should-be-same-2 {
+    CREATE TABLE t1 (a);
+    ALTER TABLE t1 ADD COLUMN price DECIMAL(10, 2);
+    SELECT sql FROM sqlite_schema WHERE name = 't1';
+} { "CREATE TABLE t1 (a, price DECIMAL (10, 2))" }
+
+
 do_execsql_test_in_memory_any_error fail-alter-table-drop-primary-key-column {
     CREATE TABLE t (a PRIMARY KEY, b);
     ALTER TABLE t DROP a;