fix: adapt dag tests to current environment

The current go-ipfs doesn't yet support running all those tests,
but at least part of them. Fix the tests that work and skip the
ones that are not yet supported.

js/src/dag.js

@@ -17,6 +17,7 @@ const CID = require('cids')
 module.exports = (common) => {
   describe('.dag', () => {
     let ipfs
+    let withGo
 
     before(function (done) {
       // CI takes longer to instantiate the daemon, so we need to increase the
@@ -28,7 +29,11 @@ module.exports = (common) => {
         factory.spawnNode((err, node) => {
           expect(err).to.not.exist()
           ipfs = node
-          done()
+          ipfs.id((err, id) => {
+            expect(err).to.not.exist()
+            withGo = id.agentVersion.startsWith('go-ipfs')
+            done()
+          })
         })
       })
     })
@@ -67,17 +72,13 @@ module.exports = (common) => {
         }, done)
       })
 
-      /*
-       * This works because dag-cbor will just treat pbNode as a regular object
+      // This works because dag-cbor will just treat pbNode as a regular object
       it.skip('dag-pb node with wrong multicodec', (done) => {
-        // This works because dag-cbor will just treat pbNode as a
-        // regular object
         ipfs.dag.put(pbNode, 'dag-cbor', 'sha3-512', (err) => {
           expect(err).to.exist()
           done()
         })
       })
-      */
 
       it('dag-cbor with default hash func (sha2-256)', (done) => {
         ipfs.dag.put(cborNode, {
@@ -93,7 +94,10 @@ module.exports = (common) => {
         }, done)
       })
 
-      it('dag-cbor node with wrong multicodec', (done) => {
+      // This works because dag-pb will serialize any object. If the object
+      // has neither a `data` nor `links` field it's serialized as an empty
+      // object
+      it.skip('dag-cbor node with wrong multicodec', (done) => {
         ipfs.dag.put(cborNode, {
           format: 'dag-pb',
           hashAlg: 'sha3-512'
@@ -106,7 +110,7 @@ module.exports = (common) => {
       it('returns the cid', (done) => {
         ipfs.dag.put(cborNode, {
           format: 'dag-cbor',
-          hashAlg: 'sha3-512'
+          hashAlg: 'sha2-256'
         }, (err, cid) => {
           expect(err).to.not.exist()
           expect(cid).to.exist()
@@ -239,10 +243,17 @@ module.exports = (common) => {
           })
         })
 
-        it('dag-pb local scope', (done) => {
+        it('dag-pb local scope', function (done) {
+          // TODO vmx 2018-02-22: Currently not supported in go-ipfs, it might
+          // be possible once https://github.com/ipfs/go-ipfs/issues/4728 is
+          // done
+          if (withGo) {
+            this.skip()
+          }
           ipfs.dag.get(cidPb, 'Data', (err, result) => {
             expect(err).to.not.exist()
-            expect(result.value).to.eql(Buffer.from('I am inside a Protobuf'))
+            console.log('vmx: result', result.value)
+            expect(result.value.data).to.eql(Buffer.from('I am inside a Protobuf'))
             done()
           })
         })
@@ -276,7 +287,13 @@ module.exports = (common) => {
         it.skip('dag-cbor two levels', (done) => {})
         it.skip('from dag-pb to dag-cbor', (done) => {})
 
-        it('from dag-cbor to dag-pb', (done) => {
+        it('from dag-cbor to dag-pb', function (done) {
+          // TODO vmx 2018-02-22: Currently not supported in go-ipfs, it might
+          // be possible once https://github.com/ipfs/go-ipfs/issues/4728 is
+          // done
+          if (withGo) {
+            this.skip()
+          }
           ipfs.dag.get(cidCbor, 'pb/Data', (err, result) => {
             expect(err).to.not.exist()
             expect(result.value).to.eql(Buffer.from('I am inside a Protobuf'))
@@ -300,7 +317,13 @@ module.exports = (common) => {
           })
         })
 
-        it('CID String + path', (done) => {
+        it('CID String + path', function (done) {
+          // TODO vmx 2018-02-22: Currently not supported in go-ipfs, it might
+          // be possible once https://github.com/ipfs/go-ipfs/issues/4728 is
+          // done
+          if (withGo) {
+            this.skip()
+          }
           const cidCborStr = cidCbor.toBaseEncodedString()
 
           ipfs.dag.get(cidCborStr + '/pb/Data', (err, result) => {
@@ -312,7 +335,12 @@ module.exports = (common) => {
       })
     })
 
-    describe('.tree', () => {
+    describe.skip('.tree', function () {
+      // TODO vmx 2018-02-22: Currently the tree API is not exposed in go-ipfs
+      if (withGo) {
+        this.skip()
+      }
+
       let nodePb
       let nodeCbor
       let cidPb