Merge pull request #44 from paritytech/units-fix

Fix parsing 0s in RLP.

src/util/units.js

@@ -48,10 +48,10 @@ let unitMap = {
 
 function getValueOfUnit (unit) {
   unit = unit ? unit.toLowerCase() : 'ether'
-  var unitValue = unitMap[unit]
+  var unitValue = unitMap[unit] || 0
   return new BigNumber(unitValue, 10)
 }
 
 export function fromWei (number, unit) {
-  return new BigNumber(number, 16).dividedBy(getValueOfUnit(unit)).toString(10)
+  return new BigNumber(number || 0, 16).dividedBy(getValueOfUnit(unit)).toString(10)
 }

src/util/units.spec.js

@@ -24,4 +24,12 @@ describe('units', () => {
     let ether = fromWei(wei)
     expect(ether).toEqual('0.000000000000021')
   })
+
+  it('should return BigNumber for undefined values', () => {
+    expect(fromWei(null)).toEqual('0')
+    expect(fromWei(undefined)).toEqual('0')
+    expect(fromWei(0)).toEqual('0')
+    expect(fromWei('0')).toEqual('0')
+    expect(fromWei('')).toEqual('0')
+  })
 })