add oct_test.go

Author: elianddb

sql/expression/function/oct_test.go

@@ -1 +1,79 @@
+// Copyright 2025 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 function
+
+import (
+	"github.com/dolthub/go-mysql-server/sql"
+	"github.com/dolthub/go-mysql-server/sql/expression"
+	"github.com/dolthub/go-mysql-server/sql/types"
+	"math"
+	"testing"
+)
+
+type test struct {
+	name     string
+	nType    sql.Type
+	row      sql.Row
+	expected interface{}
+}
+
+func TestOct(t *testing.T) {
+	tests := []test{
+		// NULL input
+		{"n is nil", types.Int32, sql.NewRow(nil), nil},
+
+		// Positive numbers
+		{"positive small", types.Int32, sql.NewRow(8), "10"},
+		{"positive medium", types.Int32, sql.NewRow(64), "100"},
+		{"positive large", types.Int32, sql.NewRow(4095), "7777"},
+		{"positive huge", types.Int64, sql.NewRow(123456789), "726746425"},
+
+		// Negative numbers
+		{"negative small", types.Int32, sql.NewRow(-8), "1777777777777777777770"},
+		{"negative medium", types.Int32, sql.NewRow(-64), "1777777777777777777700"},
+		{"negative large", types.Int32, sql.NewRow(-4095), "1777777777777777770001"},
+
+		// Zero
+		{"zero", types.Int32, sql.NewRow(0), "0"},
+
+		// String inputs
+		{"string number", types.LongText, sql.NewRow("15"), "17"},
+		{"alpha string", types.LongText, sql.NewRow("abc"), "0"},
+		{"mixed string", types.LongText, sql.NewRow("123abc"), "173"},
+
+		// Edge cases
+		{"max int32", types.Int32, sql.NewRow(math.MaxInt32), "17777777777"},
+		{"min int32", types.Int32, sql.NewRow(math.MinInt32), "1777777777760000000000"},
+		{"max int64", types.Int64, sql.NewRow(math.MaxInt64), "777777777777777777777"},
+		{"min int64", types.Int64, sql.NewRow(math.MinInt64), "1000000000000000000000"},
+
+		// Decimal numbers
+		{"decimal", types.Float64, sql.NewRow(15.5), "17"},
+		{"negative decimal", types.Float64, sql.NewRow(-15.5), "1777777777777777777761"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			f := NewOct(expression.NewGetField(0, tt.nType, "n", true))
+			result, err := f.Eval(sql.NewEmptyContext(), tt.row)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if result != tt.expected {
+				t.Errorf("got %v; expected %v", result, tt.expected)
+			}
+		})
+	}
+}