Enable metadata unit tests for Travis CI and Node.js

test/unit/api_spec.js

@@ -790,9 +790,6 @@ describe('api', function() {
       });
     });
     it('gets metadata', function(done) {
-      if (isNodeJS()) {
-        pending('Document is not supported in Node.js.');
-      }
       var promise = doc.getMetadata();
       promise.then(function(metadata) {
         expect(metadata.info['Title']).toEqual('Basic API Test');

test/unit/clitests.json

@@ -14,6 +14,7 @@
     "evaluator_spec.js",
     "fonts_spec.js",
     "function_spec.js",
+    "metadata_spec.js",
     "murmurhash3_spec.js",
     "node_stream_spec.js",
     "parser_spec.js",