/*
 *
 * Copyright 2020 gRPC 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 metadata

import (
	"testing"

	"github.com/google/go-cmp/cmp"
	"google.golang.org/grpc/attributes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/grpc/resolver"
)

func TestGet(t *testing.T) {
	tests := []struct {
		name string
		addr resolver.Address
		want metadata.MD
	}{
		{
			name: "not set",
			addr: resolver.Address{},
			want: nil,
		},
		{
			name: "not set",
			addr: resolver.Address{
				Attributes: attributes.New(mdKey, metadata.Pairs("k", "v")),
			},
			want: metadata.Pairs("k", "v"),
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := Get(tt.addr); !cmp.Equal(got, tt.want) {
				t.Errorf("Get() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestSet(t *testing.T) {
	tests := []struct {
		name string
		addr resolver.Address
		md   metadata.MD
	}{
		{
			name: "unset before",
			addr: resolver.Address{},
			md:   metadata.Pairs("k", "v"),
		},
		{
			name: "set before",
			addr: resolver.Address{
				Attributes: attributes.New(mdKey, metadata.Pairs("bef", "ore")),
			},
			md: metadata.Pairs("k", "v"),
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			newAddr := Set(tt.addr, tt.md)
			newMD := Get(newAddr)
			if !cmp.Equal(newMD, tt.md) {
				t.Errorf("md after Set() = %v, want %v", newMD, tt.md)
			}
		})
	}
}