PLT-4403 Add server-based channel autocomplete, search and paging (#4585)

* Add more channel paging API

* Add channel paging support to client

* Add DB channel search functions

* Add API for searching more channels

* Add more channel search functionality to client

* Add API for autocompleting channels

* Add channel autocomplete functionality to the client

* Move to be deprecated APIs to their own file

* Final clean-up

* Fixes related to feedback

* Localization changes

* Add unit as suffix to timeout constants

api/deprecated_test.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api
+
+import (
+	"testing"
+
+	"github.com/mattermost/platform/model"
+)
+
+func TestGetMoreChannel(t *testing.T) {
+	th := Setup().InitBasic()
+	Client := th.BasicClient
+	team := th.BasicTeam
+
+	channel1 := &model.Channel{DisplayName: "A Test API Name", Name: "a" + model.NewId() + "a", Type: model.CHANNEL_OPEN, TeamId: team.Id}
+	channel1 = Client.Must(Client.CreateChannel(channel1)).Data.(*model.Channel)
+
+	channel2 := &model.Channel{DisplayName: "B Test API Name", Name: "a" + model.NewId() + "a", Type: model.CHANNEL_OPEN, TeamId: team.Id}
+	channel2 = Client.Must(Client.CreateChannel(channel2)).Data.(*model.Channel)
+
+	th.LoginBasic2()
+
+	rget := Client.Must(Client.GetMoreChannels(""))
+	channels := rget.Data.(*model.ChannelList)
+
+	if (*channels)[0].DisplayName != channel1.DisplayName {
+		t.Fatal("full name didn't match")
+	}
+
+	if (*channels)[1].DisplayName != channel2.DisplayName {
+		t.Fatal("full name didn't match")
+	}
+
+	// test etag caching
+	if cache_result, err := Client.GetMoreChannels(rget.Etag); err != nil {
+		t.Fatal(err)
+	} else if cache_result.Data.(*model.ChannelList) != nil {
+		t.Log(cache_result.Data)
+		t.Fatal("cache should be empty")
+	}
+}