feat: format SQL code via sqlparse in the /format endpoint

test_formatter.py

@@ -31,3 +31,24 @@ def test_format_cpp_uses_allman_braces():
 def test_format_unsupported_language_raises():
     with pytest.raises(FormatError):
         format_code("print(1)", "java")
+
+
+def test_format_sql_uppercases_keywords():
+    result = format_code("select * from students where score>60", "sql")
+    assert result == "SELECT * FROM students WHERE score>60"
+
+
+def test_format_sql_splits_multiple_statements():
+    result = format_code(
+        "delete from students where score<60;insert into students (id) values (9);",
+        "sql",
+    )
+    assert result == (
+        "DELETE FROM students WHERE score<60;\n\n"
+        "INSERT INTO students (id) VALUES (9);"
+    )
+
+
+def test_format_sql_tolerates_syntax_errors():
+    result = format_code("select from where", "sql")
+    assert result == "SELECT FROM WHERE"