subscriptions: Add templating support and integrate with Binance (#1568)

* Subscriptions: Add List.AssetPairs

* Subscriptions: Add Template and QualifiedChannel

These fields separate the concept of what the channel is from the
qualified resource name

* Subscriptions: Add List.SetStates()

* Subscriptions: Add List.QualifiedChannels

* Subscriptions: Rename testsubs.EqualLists

* Binance: Switch to ExpandTemplates

* Binance: Update ConfigTest format

* Subscriptions: Test Coverage improvements

* Subscriptions: Reenterant List.ExpandTemplates

* Subscriptions: Move templates from subscriptions to exchanges

* Binance: Inline subscription template and improvements

exchanges/exchange_test.go

@@ -2818,11 +2818,7 @@ func TestGetCachedOpenInterest(t *testing.T) {
 // TestSetSubscriptionsFromConfig tests the setting and loading of subscriptions from config and exchange defaults
 func TestSetSubscriptionsFromConfig(t *testing.T) {
 	t.Parallel()
-	b := Base{
-		Config: &config.Exchange{
-			Features: &config.FeaturesConfig{},
-		},
-	}
+	b := Base{Config: &config.Exchange{Features: &config.FeaturesConfig{}}}
 	subs := subscription.List{
 		{Channel: subscription.CandlesChannel, Interval: kline.OneDay, Enabled: true},
 		{Channel: subscription.OrderbookChannel, Enabled: false},
@@ -2900,6 +2896,17 @@ func TestGetDefaultConfig(t *testing.T) {
 	assert.Equal(t, cpy, exch.Requester)
 }
 
+// TestCanUseAuthenticatedWebsocketEndpoints exercises CanUseAuthenticatedWebsocketEndpoints
+func TestCanUseAuthenticatedWebsocketEndpoints(t *testing.T) {
+	t.Parallel()
+	e := &FakeBase{}
+	assert.False(t, e.CanUseAuthenticatedWebsocketEndpoints(), "CanUseAuthenticatedWebsocketEndpoints should return false with nil websocket")
+	e.Websocket = stream.NewWebsocket()
+	assert.False(t, e.CanUseAuthenticatedWebsocketEndpoints())
+	e.Websocket.SetCanUseAuthenticatedEndpoints(true)
+	assert.True(t, e.CanUseAuthenticatedWebsocketEndpoints())
+}
+
 // FakeBase is used to override functions
 type FakeBase struct{ Base }