Assets: Fix False positives with IsValid

supportedFlag&a is true for every even number, making the test pretty
close to meaningless.

[This
fix](5b33bc5)
was a viable fix maintaining bit shifted iota, but there's no benefit to
it at all.

Simplifying.

exchanges/asset/asset.go

@@ -22,37 +22,33 @@ type Items []Item
 
 // Supported Assets
 const (
-	Empty Item = 0
-	Spot  Item = 1 << (iota - 1)
+	Empty Item = iota
+	Spot
 	Margin
 	CrossMargin
 	MarginFunding
 	Index
 	Binary
+	Futures // All Futures must come after this
 	PerpetualContract
 	PerpetualSwap
-	Futures
 	DeliveryFutures
 	UpsideProfitContract
 	DownsideProfitContract
 	CoinMarginedFutures
 	USDTMarginedFutures
 	USDCMarginedFutures
-	Options
-	OptionCombo
 	FutureCombo
 	LinearContract // Derivatives with a linear Base (e.g. USDT or USDC)
-	All            // Must come immediately after all valid assets
+	Options        // All Options must come after this
+	OptionCombo
+	All // Must come immediately after all valid assets
 )
 
 const (
-	optionsFlag   = OptionCombo | Options
-	futuresFlag   = PerpetualContract | PerpetualSwap | Futures | DeliveryFutures | UpsideProfitContract | DownsideProfitContract | CoinMarginedFutures | USDTMarginedFutures | USDCMarginedFutures | LinearContract | FutureCombo
-	supportedFlag = Spot | Margin | CrossMargin | MarginFunding | Index | Binary | PerpetualContract | PerpetualSwap | Futures | DeliveryFutures | UpsideProfitContract | DownsideProfitContract | CoinMarginedFutures | USDTMarginedFutures | USDCMarginedFutures | Options | LinearContract | OptionCombo | FutureCombo
-
 	spot                   = "spot"
 	margin                 = "margin"
-	crossMargin            = "cross_margin" // for Gateio exchange
+	crossMargin            = "cross_margin"
 	marginFunding          = "marginfunding"
 	index                  = "index"
 	binary                 = "binary"
@@ -160,7 +156,17 @@ func (a Items) JoinToString(separator string) string {
 
 // IsValid returns whether or not the supplied asset type is valid or not
 func (a Item) IsValid() bool {
-	return a != Empty && supportedFlag&a == a
+	return a > Empty && a < All
+}
+
+// IsFutures checks if the asset type is a futures contract based asset
+func (a Item) IsFutures() bool {
+	return a >= Futures && a < Options
+}
+
+// IsOptions checks if the asset type is options contract based asset
+func (a Item) IsOptions() bool {
+	return a >= Options && a < All
 }
 
 // UnmarshalJSON conforms type to the umarshaler interface
@@ -242,13 +248,3 @@ func New(input string) (Item, error) {
 func UseDefault() Item {
 	return Spot
 }
-
-// IsFutures checks if the asset type is a futures contract based asset
-func (a Item) IsFutures() bool {
-	return a != Empty && futuresFlag&a == a
-}
-
-// IsOptions checks if the asset type is options contract based asset
-func (a Item) IsOptions() bool {
-	return a != Empty && optionsFlag&a == a
-}

exchanges/asset/asset_test.go

@@ -3,9 +3,11 @@ package asset
 import (
 	"encoding/json"
 	"errors"
+	"slices"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestString(t *testing.T) {
@@ -53,12 +55,37 @@ func TestJoinToString(t *testing.T) {
 
 func TestIsValid(t *testing.T) {
 	t.Parallel()
-	if Item(0).IsValid() {
-		t.Fatal("TestIsValid returned an unexpected result")
+	for a := range All {
+		if a.String() == "" {
+			require.Falsef(t, a.IsValid(), "IsValid must return false with non-asset value %d", a)
+		} else {
+			require.Truef(t, a.IsValid(), "IsValid must return true for %s", a)
+		}
 	}
+	require.Falsef(t, All.IsValid(), "IsValid must return false for All")
+}
 
-	if !Spot.IsValid() {
-		t.Fatal("TestIsValid returned an unexpected result")
+func TestIsFutures(t *testing.T) {
+	t.Parallel()
+	valid := []Item{PerpetualContract, PerpetualSwap, Futures, DeliveryFutures, UpsideProfitContract, DownsideProfitContract, CoinMarginedFutures, USDTMarginedFutures, USDCMarginedFutures, FutureCombo, LinearContract}
+	for a := range All {
+		if slices.Contains(valid, a) {
+			require.Truef(t, a.IsFutures(), "IsFutures must return true for %s", a)
+		} else {
+			require.Falsef(t, a.IsFutures(), "IsFutures must return false for non-asset value %d (%s)", a, a)
+		}
+	}
+}
+
+func TestIsOptions(t *testing.T) {
+	t.Parallel()
+	valid := []Item{Options, OptionCombo}
+	for a := range All {
+		if slices.Contains(valid, a) {
+			require.Truef(t, a.IsOptions(), "IsOptions must return true for %s", a)
+		} else {
+			require.Falsef(t, a.IsOptions(), "IsOptions must return false for non-asset value %d (%s)", a, a)
+		}
 	}
 }
 
@@ -117,50 +144,6 @@ func TestSupported(t *testing.T) {
 	}
 }
 
-func TestIsFutures(t *testing.T) {
-	t.Parallel()
-	for _, a := range []Item{Spot, Margin, MarginFunding, Index, Binary} {
-		assert.Falsef(t, a.IsFutures(), "%s should return correctly for IsFutures", a)
-	}
-	for _, a := range []Item{PerpetualContract, PerpetualSwap, Futures, UpsideProfitContract, DownsideProfitContract, CoinMarginedFutures, USDTMarginedFutures, USDCMarginedFutures, FutureCombo} {
-		assert.Truef(t, a.IsFutures(), "%s should return correctly for IsFutures", a)
-	}
-}
-
-func TestIsOptions(t *testing.T) {
-	t.Parallel()
-	type scenario struct {
-		item      Item
-		isOptions bool
-	}
-	scenarios := []scenario{
-		{
-			item:      Options,
-			isOptions: true,
-		}, {
-			item:      OptionCombo,
-			isOptions: true,
-		},
-		{
-			item:      Futures,
-			isOptions: false,
-		},
-		{
-			item:      Empty,
-			isOptions: false,
-		},
-	}
-	for _, s := range scenarios {
-		testScenario := s
-		t.Run(testScenario.item.String(), func(t *testing.T) {
-			t.Parallel()
-			if testScenario.item.IsOptions() != testScenario.isOptions {
-				t.Errorf("expected %v isOptions to be %v", testScenario.item, testScenario.isOptions)
-			}
-		})
-	}
-}
-
 func TestUnmarshalMarshal(t *testing.T) {
 	t.Parallel()
 	data, err := json.Marshal(Item(0))

exchanges/order/order_test.go

@@ -55,7 +55,7 @@ func TestSubmit_Validate(t *testing.T) {
 			Submit: &Submit{
 				Exchange:  "test",
 				Pair:      testPair,
-				AssetType: 255,
+				AssetType: asset.All,
 			},
 		}, // valid pair but invalid asset
 		{