feat: add util.cid options (#17)

See ipld/interface-ipld-format#40

eth-tx/test/resolver.spec.js

@@ -5,6 +5,8 @@ const expect = require('chai').expect
 const Transaction = require('ethereumjs-tx')
 const dagEthBlock = require('../index')
 const resolver = dagEthBlock.resolver
+const util = dagEthBlock.util
+const multihash = require('multihashes')
 
 describe('IPLD format resolver (local)', () => {
   let testIpfsBlob
@@ -56,4 +58,32 @@ describe('IPLD format resolver (local)', () => {
       })
     })
   })
+
+  describe('util', () => {
+    it('create CID, no options', (done) => {
+      const testTx = new Transaction(testData)
+      util.cid(testTx, (err, cid) => {
+        expect(err).to.not.exist()
+        expect(cid.version).to.equal(1)
+        expect(cid.codec).to.equal('eth-tx')
+        expect(cid.multihash).to.exist()
+        const mh = multihash.decode(cid.multihash)
+        expect(mh.name).to.equal('keccak-256')
+        done()
+      })
+    })
+
+    it('create CID, empty options', (done) => {
+      const testTx = new Transaction(testData)
+      util.cid(testTx, {}, (err, cid) => {
+        expect(err).to.not.exist()
+        expect(cid.version).to.equal(1)
+        expect(cid.codec).to.equal('eth-tx')
+        expect(cid.multihash).to.exist()
+        const mh = multihash.decode(cid.multihash)
+        expect(mh.name).to.equal('keccak-256')
+        done()
+      })
+    })  
+  })
 })

util/createUtil.js

@@ -7,6 +7,6 @@ function createUtil (multicodec, EthObjClass) {
   return {
     deserialize: asyncify((serialized) => new EthObjClass(serialized)),
     serialize: asyncify((ethObj) => ethObj.serialize()),
-    cid: asyncify((ethObj) => cidFromEthObj(multicodec, ethObj))
+    cid: asyncify((ethObj, options) => cidFromEthObj(multicodec, ethObj))
   }
 }