exchanges: Improve TestMain usage (#1946)

* exchanges: Improve TestMain usage

* exchanges: Further cleanups

* exchanges/kucoin: update TestProcessOrderbook to use test context

* refactor: rename SetRunning to SetRunningURL for clarity across exchanges

exchanges/kucoin/kucoin_test.go

@@ -53,7 +53,7 @@ var (
 func TestMain(m *testing.M) {
 	ku = new(Kucoin)
 	if err := testexch.Setup(ku); err != nil {
-		log.Fatal(err)
+		log.Fatalf("Kucoin Setup error: %s", err)
 	}
 
 	if apiKey != "" && apiSecret != "" && passPhrase != "" {
@@ -64,14 +64,12 @@ func TestMain(m *testing.M) {
 		ku.Websocket.SetCanUseAuthenticatedEndpoints(true)
 	}
 
-	ctx := context.Background()
-	getFirstTradablePairOfAssets(ctx)
+	getFirstTradablePairOfAssets(context.Background())
 	assertToTradablePairMap = map[asset.Item]currency.Pair{
 		asset.Spot:    spotTradablePair,
 		asset.Margin:  marginTradablePair,
 		asset.Futures: futuresTradablePair,
 	}
-	ku.setupOrderbookManager(ctx)
 	fetchedFuturesOrderbook = map[string]bool{}
 
 	os.Exit(m.Run())
@@ -2976,6 +2974,7 @@ func TestProcessOrderbook(t *testing.T) {
 	response := &WsOrderbook{}
 	err := json.Unmarshal([]byte(wsOrderbookData), &response)
 	assert.NoError(t, err)
+	ku.setupOrderbookManager(t.Context())
 	result, err := ku.updateLocalBuffer(response, asset.Spot)
 	assert.NoError(t, err)
 	assert.NotNil(t, result)