Fix exception thrown on getTokenData

2 files changed, 24 insertions, 2 deletions

diff --git a/ui/app/helpers/tests/transactions.util.test.js b/ui/app/helpers/tests/transactions.util.test.js
new file mode 100644
index 000000000..103a84a8c
--- /dev/null
+++ b/ui/app/helpers/tests/transactions.util.test.js
@@ -0,0 +1,22 @@
+import * as utils from '../transactions.util'
+import assert from 'assert'
+
+describe('Transactions utils', () => {
+  describe('getTokenData', () => {
+    it('should return token data', () => {
+      const tokenData = utils.getTokenData('0xa9059cbb00000000000000000000000050a9d56c2b8ba9a5c7f2c08c3d26e0499f23a7060000000000000000000000000000000000000000000000000000000000004e20')
+      assert.ok(tokenData)
+      const { name, params } = tokenData
+      assert.equal(name, 'transfer')
+      const [to, value] = params
+      assert.equal(to.name, '_to')
+      assert.equal(to.type, 'address')
+      assert.equal(value.name, '_value')
+      assert.equal(value.type, 'uint256')
+    })
+
+    it('should not throw errors when called without arguments', () => {
+      assert.doesNotThrow(() => utils.getTokenData())
+    })
+  })
+})
diff --git a/ui/app/helpers/transactions.util.js b/ui/app/helpers/transactions.util.js
index 0e1a6ca37..54bb3bcb9 100644
--- a/ui/app/helpers/transactions.util.js
+++ b/ui/app/helpers/transactions.util.js
@@ -20,13 +20,13 @@ import { addCurrencies } from '../conversion-util'
 
 abiDecoder.addABI(abi)
 
-export function getTokenData (data = {}) {
+export function getTokenData (data = '') {
   return abiDecoder.decodeMethod(data)
 }
 
 const registry = new MethodRegistry({ provider: global.ethereumProvider })
 
-export async function getMethodData (data = {}) {
+export async function getMethodData (data = '') {
   const prefixedData = ethUtil.addHexPrefix(data)
   const fourBytePrefix = prefixedData.slice(0, 10)
   const sig = await registry.lookup(fourBytePrefix)