chore: import upstream snapshot with attribution

testing/go/sql_parser_test.go

@@ -0,0 +1,52 @@
+// Copyright 2024 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package _go
+
+import (
+	"context"
+	"testing"
+
+	vitess "github.com/dolthub/vitess/go/vt/sqlparser"
+	"github.com/stretchr/testify/require"
+
+	"github.com/dolthub/doltgresql/postgres/parser/parser/sql"
+)
+
+// TestParserBehaviors tests behaviors, such as empty statement handling, for the Doltgres parser.
+func TestParserBehaviors(t *testing.T) {
+	parser := sql.NewPostgresParser()
+
+	// Parser implementations should return Vitess' ErrEmpty error for empty statements.
+	t.Run("empty statement parsing", func(t *testing.T) {
+		emptyStatements := []string{"", " ", "\t", ";", "-- comment", "/* comment */"}
+		for _, statement := range emptyStatements {
+			parsed, err := parser.ParseSimple(statement)
+			require.Nil(t, parsed)
+			require.ErrorIs(t, err, vitess.ErrEmpty)
+
+			parsed, _, _, err = parser.Parse(nil, statement, true)
+			require.Nil(t, parsed)
+			require.ErrorIs(t, err, vitess.ErrEmpty)
+
+			parsed, _, err = parser.ParseOneWithOptions(context.Background(), statement, vitess.ParserOptions{})
+			require.Nil(t, parsed)
+			require.ErrorIs(t, err, vitess.ErrEmpty)
+
+			parsed, _, _, err = parser.ParseWithOptions(context.Background(), statement, ';', false, vitess.ParserOptions{})
+			require.Nil(t, parsed)
+			require.ErrorIs(t, err, vitess.ErrEmpty)
+		}
+	})
+}