Kucoin: Fix intermittent conflict in test currs

Use isolated test instance for `TestGetOpenInterest`.

`TestGetOpenInterest` would occassionally change pairs before
GenerateDefault Subs.

exchanges/kucoin/kucoin_test.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/gofrs/uuid"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"github.com/thrasher-corp/gocryptotrader/common"
 	"github.com/thrasher-corp/gocryptotrader/common/key"
 	"github.com/thrasher-corp/gocryptotrader/config"
@@ -29,6 +30,7 @@ import (
 	"github.com/thrasher-corp/gocryptotrader/exchanges/stream/buffer"
 	"github.com/thrasher-corp/gocryptotrader/exchanges/subscription"
 	"github.com/thrasher-corp/gocryptotrader/exchanges/ticker"
+	testexch "github.com/thrasher-corp/gocryptotrader/internal/testing/exchange"
 	"github.com/thrasher-corp/gocryptotrader/portfolio/withdraw"
 )
 
@@ -2713,14 +2715,18 @@ func TestUpdateOrderExecutionLimits(t *testing.T) {
 
 func TestGetOpenInterest(t *testing.T) {
 	t.Parallel()
-	_, err := ku.GetOpenInterest(context.Background(), key.PairAsset{
+
+	nu := new(Kucoin)
+	require.NoError(t, testexch.TestInstance(nu), "TestInstance setup should not error")
+
+	_, err := nu.GetOpenInterest(context.Background(), key.PairAsset{
 		Base:  currency.ETH.Item,
 		Quote: currency.USDT.Item,
 		Asset: asset.USDTMarginedFutures,
 	})
 	assert.ErrorIs(t, err, asset.ErrNotSupported)
 
-	resp, err := ku.GetOpenInterest(context.Background(), key.PairAsset{
+	resp, err := nu.GetOpenInterest(context.Background(), key.PairAsset{
 		Base:  futuresTradablePair.Base.Item,
 		Quote: futuresTradablePair.Quote.Item,
 		Asset: asset.Futures,
@@ -2729,8 +2735,8 @@ func TestGetOpenInterest(t *testing.T) {
 	assert.NotEmpty(t, resp)
 
 	cp1 := currency.NewPair(currency.ETH, currency.USDTM)
-	sharedtestvalues.SetupCurrencyPairsForExchangeAsset(t, ku, asset.Futures, cp1)
-	resp, err = ku.GetOpenInterest(context.Background(),
+	sharedtestvalues.SetupCurrencyPairsForExchangeAsset(t, nu, asset.Futures, cp1)
+	resp, err = nu.GetOpenInterest(context.Background(),
 		key.PairAsset{
 			Base:  futuresTradablePair.Base.Item,
 			Quote: futuresTradablePair.Quote.Item,
@@ -2745,7 +2751,7 @@ func TestGetOpenInterest(t *testing.T) {
 	assert.NoError(t, err)
 	assert.NotEmpty(t, resp)
 
-	resp, err = ku.GetOpenInterest(context.Background())
+	resp, err = nu.GetOpenInterest(context.Background())
 	assert.NoError(t, err)
 	assert.NotEmpty(t, resp)
 }