// Copyright Istio Authors
//
// 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 xds

import (
	"fmt"
	"strings"
	"testing"
)

func TestAtMostNJoin(t *testing.T) {
	tests := []struct {
		data  []string
		limit int
		want  string
	}{
		{
			[]string{"a", "b", "c"},
			2,
			"a, and 2 others",
		},
		{
			[]string{"a", "b", "c"},
			4,
			"a, b, c",
		},
		{
			[]string{"a", "b", "c"},
			1,
			"a, b, c",
		},
		{
			[]string{"a", "b", "c"},
			0,
			"a, b, c",
		},
		{
			[]string{},
			3,
			"",
		},
	}
	for _, tt := range tests {
		t.Run(fmt.Sprintf("%s-%d", strings.Join(tt.data, "-"), tt.limit), func(t *testing.T) {
			if got := atMostNJoin(tt.data, tt.limit); got != tt.want {
				t.Errorf("got %v, want %v", got, tt.want)
			}
		})
	}
}
