gun-ipfs plugin: added a stub test for unpublished content handling (ref. #8)

__tests__/plugins/gun-ipfs.test.js

@@ -15,13 +15,24 @@ describe("plugin: gun-ipfs", () => {
     self.log = function(component, ...items) {
         console.debug(component + ' :: ', ...items)
     }
-    self.Ipfs = {
+    global.Ipfs = {
         create: ()=>{
             return Promise.resolve({})
         }
     }
+    self.Ipfs = global.Ipfs
     self.gunUser = jest.fn(()=>{
-      return {}
+      return {
+        get: () => {
+          return {
+            get: ()=>{
+              return {
+                once: (arg)=>{ arg(undefined) }
+              }
+            }
+          }
+        }
+      }
     })
     global.Gun = jest.fn((nodes)=>{
       return {
@@ -61,4 +72,15 @@ describe("plugin: gun-ipfs", () => {
       self.LibResilientPlugins[0].publish([true, 5])
     }).toThrow('Only accepts: string, Array of string, Response.')
   })
+  
+  test("fetching should error out for unpublished content", async ()=>{
+    require("../../plugins/gun-ipfs.js");
+    
+    expect.assertions(1)
+    try {
+      await self.LibResilientPlugins[0].fetch(self.location.origin + '/test.json')
+    } catch(e) {
+      expect(e).toEqual(new Error('IPFS address is undefined for: /test.json'))
+    }
+  })
 });