change BN.mul to BN.muln

app/scripts/lib/tx-utils.js

@@ -71,7 +71,7 @@ module.exports = class txProviderUtils {
   addGasBuffer (gas, blockGasLimitHex) {
     const blockGasLimitBn = new BN(ethUtil.stripHexPrefix(blockGasLimitHex), 16)
     const bnGas = new BN(ethUtil.stripHexPrefix(gas), 16)
-    const bufferedGas = bnGas.mul(1.5)
+    const bufferedGas = bnGas.muln(1.5)
 
     if (bnGas.gt(blockGasLimitBn)) return gas
     if (bufferedGas.lt(blockGasLimitBn)) return ethUtil.addHexPrefix(bufferedGas.toString(16))

test/unit/tx-utils-test.js

@@ -13,16 +13,14 @@ describe('txUtils', function() {
   })
 
   describe('addGasBuffer', function() {
-    describe('multiplies by 1.5', function() {
-      it('over a value', function() {
+    it('multiplies by 1.5', function() {
       const input = '0x123fad'
       const output = txUtils.addGasBuffer(input, '0x3d4c52') //0x3d4c52 is 4mil for dummy gas limit
 
-        const inputBn = new BN(input, 'hex')
-        const outputBn = new BN(output, 'hex')
-        const expectedBn = inputBn.mul(1.5)
+      const inputBn = new BN(ethUtil.stripHexPrefix(input), 'hex')
+      const outputBn = new BN(ethUtil.stripHexPrefix(output), 'hex')
+      const expectedBn = inputBn.muln(1.5)
       assert(outputBn.eq(expectedBn), 'returns 1.5 the input value')
     })
   })
-  })
 })