chore: import upstream snapshot with attribution

server/functions/bpchar_test.go

@@ -0,0 +1,69 @@
+// Copyright 2026 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 functions
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTruncateString(t *testing.T) {
+	tests := []struct {
+		inStr  string
+		inLen  int32
+		expStr string
+		expLen int32
+	}{
+		{
+			// ascii string is not truncated
+			inStr:  "abc",
+			inLen:  100,
+			expStr: "abc",
+			expLen: 3,
+		},
+		{
+			// ascii string is truncated
+			inStr:  "abcdefgh",
+			inLen:  5,
+			expStr: "abcde",
+			expLen: 5,
+		},
+		{
+			// non ascii string is not truncated
+			inStr:  "こんにちは", // 5 characters 15 bytes
+			inLen:  100,
+			expStr: "こんにちは",
+			expLen: 5,
+		},
+		{
+			// non ascii string is truncated
+			inStr:  "こんにちは", // 5 characters 15 bytes
+			inLen:  3,
+			expStr: "こんに",
+			expLen: 3,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("truncateString(%s, %d)", test.inStr, test.inLen), func(t *testing.T) {
+			outStr, outLen := truncateString(test.inStr, test.inLen)
+			assert.Equal(t, test.expStr, outStr)
+			assert.Equal(t, test.expLen, outLen)
+		})
+	}
+
+}