Added missing 'source' getter on Spec02

Signed-off-by: Michele Angioni <michele.angioni@takeaway.com>

lib/specs/spec_0_2.js

@@ -59,6 +59,10 @@ Spec02.prototype.source = function(_source){
   return this;
 };
 
+Spec02.prototype.getSource = function() {
+  return this.payload["source"];
+};
+
 Spec02.prototype.id = function(_id){
   this.payload["id"] = _id;
   return this;

test/cloudevent_spec_0_1.js

@@ -15,6 +15,19 @@ var cloudevent = new Cloudevent()
 
 describe("CloudEvents Spec 0.1 - JavaScript SDK", () => {
 
+  describe("Object properties", () => {
+
+    describe("Attribute getters", () => {
+      it("returns 'type'", () => {
+        expect(cloudevent.getType()).to.equal(type);
+      });
+
+      it("returns 'source'", () => {
+        expect(cloudevent.getSource()).to.equal(source);
+      });
+    });
+  });
+
   describe("JSON Format", () => {
 
     describe("Required context attributes", () => {

test/cloudevent_spec_0_2.js

@@ -9,13 +9,26 @@ const contenttype = "application/json";
 const data = {};
 const extensions = {};
 
-var cloudevent = 
+var cloudevent =
   new Cloudevent(Cloudevent.specs["0.2"])
         .type(type)
         .source(source);
 
 describe("CloudEvents Spec 0.2 - JavaScript SDK", () => {
 
+  describe("Object properties", () => {
+
+    describe("Attribute getters", () => {
+      it("returns 'type'", () => {
+        expect(cloudevent.getType()).to.equal(type);
+      });
+
+      it("returns 'source'", () => {
+        expect(cloudevent.getSource()).to.equal(source);
+      });
+    });
+  });
+
   describe("JSON Format", () => {
 
     describe("Required context attributes", () => {
@@ -68,8 +81,8 @@ describe("CloudEvents Spec 0.2 - JavaScript SDK", () => {
       });
 
       it("should throw an error when employ reserved name as extension", () => {
-        
+
-        var cevt = 
+        var cevt =
           new Cloudevent(Cloudevent.specs["0.2"])
                 .type(type)
                 .source(source);