Okx: Fix GetInsuranceFundInformation "" resp (#1405)

* Okx: Fix GetInsuranceFundInformation "" resp

When amount is "" this was erroring

* Test: Standardise configtest.json

Simple jq formatting of configtest
git diff -w or github ignore whitespaces should show no changes.
Any conflicts, just accept --ours and reformat it. Or not :o)

exchanges/okx/okx_test.go

@@ -359,12 +359,18 @@ func TestGetPublicUnderlyings(t *testing.T) {
 
 func TestGetInsuranceFundInformation(t *testing.T) {
 	t.Parallel()
-	if _, err := ok.GetInsuranceFundInformation(contextGenerate(), &InsuranceFundInformationRequestParams{
+	r, err := ok.GetInsuranceFundInformation(contextGenerate(), &InsuranceFundInformationRequestParams{
 		InstrumentType: "FUTURES",
 		Underlying:     "BTC-USDT",
 		Limit:          2,
-	}); err != nil {
-		t.Error("Okx GetInsuranceFundInformation() error", err)
+	})
+	assert.NoError(t, err, "GetInsuranceFundInformation should not error")
+	assert.Positive(t, r.Total, "Total should be positive")
+	assert.NotEmpty(t, r.Details, "Should have some details")
+	for _, d := range r.Details {
+		assert.Positive(t, d.Balance, "Balance should be positive")
+		assert.NotEmpty(t, d.Type, "Type should not be empty")
+		assert.Positive(t, d.Timestamp, "Timestamp should be positive")
 	}
 }
 

exchanges/okx/okx_types.go

@@ -505,11 +505,11 @@ type InsuranceFundInformation struct {
 // InsuranceFundInformationDetail represents an Insurance fund information item for a
 // single currency and type
 type InsuranceFundInformationDetail struct {
-	Amount    float64          `json:"amt,string"`
-	Balance   float64          `json:"balance,string"`
-	Currency  string           `json:"ccy"`
-	Timestamp okxUnixMilliTime `json:"ts"`
-	Type      string           `json:"type"`
+	Amount    convert.StringToFloat64 `json:"amt"`
+	Balance   convert.StringToFloat64 `json:"balance"`
+	Currency  string                  `json:"ccy"`
+	Timestamp okxUnixMilliTime        `json:"ts"`
+	Type      string                  `json:"type"`
 }
 
 // SupportedCoinsData holds information about currencies supported by the trading data endpoints.