Df tests, version dump

lib/docker.js

@@ -1262,7 +1262,7 @@ Docker.prototype.ping = function(callback) {
  *		get usage data information
  * @param  {Function} callback Callback
  */
-Docker.prototype.systemDf = function(callback) {
+Docker.prototype.df = function(callback) {
   var self = this;
   var optsf = {
     path: '/system/df',

package.json

@@ -1,7 +1,7 @@
 {
   "name": "dockerode",
   "description": "Docker Remote API module.",
-  "version": "2.5.2",
+  "version": "2.5.3",
   "author": "Pedro Dias <[email protected]>",
   "maintainers": [
     "apocas <[email protected]>"

test/docker.js

@@ -515,6 +515,20 @@ describe("#docker", function() {
     });
   });
 
+  describe("#df", function() {
+    it("should return df", function(done) {
+      this.timeout(5000);
+
+      function handler(err, data) {
+        expect(err).to.be.null;
+        expect(data).to.be.ok;
+        done();
+      }
+
+      docker.df(handler);
+    });
+  });
+
   describe("#searchImages", function() {
     it("should return search results", function(done) {
       this.timeout(120000);