Fix for IsMultiSigOut index out of range error (#116)

* Fix for IsMultiSigOut index out of range error

* Updating test for linter

Author: waqas64

bscript/script.go

@@ -322,7 +322,7 @@ func (s *Script) IsMultiSigOut() bool {
 		}
 	}
 
-	return isSmallIntOp(parts[len(parts)-2][0]) &&
+	return len(parts[len(parts)-2]) > 0 && isSmallIntOp(parts[len(parts)-2][0]) && len(parts[len(parts)-1]) > 0 &&
 		parts[len(parts)-1][0] == OpCHECKMULTISIG
 }
 

bscript/script_test.go

@@ -181,12 +181,25 @@ func TestScript_IsData(t *testing.T) {
 func TestScript_IsMultisigOut(t *testing.T) { // TODO: check this
 	t.Parallel()
 
-	b, err := hex.DecodeString("5201110122013353ae")
-	assert.NoError(t, err)
+	t.Run("is multisig", func(t *testing.T) {
+		b, err := hex.DecodeString("5201110122013353ae")
+		assert.NoError(t, err)
 
-	scriptPub := bscript.NewFromBytes(b)
-	assert.NotNil(t, scriptPub)
-	assert.Equal(t, true, scriptPub.IsMultiSigOut())
+		scriptPub := bscript.NewFromBytes(b)
+		assert.NotNil(t, scriptPub)
+		assert.Equal(t, true, scriptPub.IsMultiSigOut())
+	})
+
+	t.Run("is not multisig and no error", func(t *testing.T) {
+		//Test Txid:de22e20422dbba8e8eeab87d5532480499abb01d6619bb66fe374f4d4a7500ee, vout:1
+
+		b, err := hex.DecodeString("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")
+		assert.NoError(t, err)
+
+		scriptPub := bscript.NewFromBytes(b)
+		assert.NotNil(t, scriptPub)
+		assert.Equal(t, false, scriptPub.IsMultiSigOut())
+	})
 }
 
 func TestScript_PublicKeyHash(t *testing.T) {

fees_test.go

@@ -617,10 +617,15 @@ func TestFeeQuote_MarshalUnmarshalJSON(t *testing.T) {
 	}
 	for name, test := range tests {
 		t.Run(name, func(t *testing.T) {
-			// nolint:errchkjson // it's a test, who cares
-			bb, _ := json.Marshal(test.quote)
+			bb, err := json.Marshal(test.quote)
+			if err != nil {
+				assert.Error(t, err)
+				assert.EqualError(t, err, test.err.Error())
+				return
+			}
+
 			var quote *FeeQuote
-			err := json.Unmarshal(bb, &quote)
+			err = json.Unmarshal(bb, &quote)
 			if test.err != nil {
 				assert.Error(t, err)
 				assert.EqualError(t, err, test.err.Error())