service-worker: test for external urls added (ref. #8)

__tests__/service-worker.test.js

@@ -109,6 +109,44 @@ describe("service-worker", () => {
     expect(response.headers.get('X-LibResilient-ETag')).toEqual('TestingETagHeader')
   });
   
+  test("making an external request should work and not go through the plugins", async () => {
+      global.fetch.mockImplementation((request, init) => {
+          return Promise.resolve(
+                    new Response(
+                        new Blob(
+                            [JSON.stringify({ test: "success" })],
+                            {type: "application/json"}
+                        ),
+                        {
+                            status: 200,
+                            statusText: "OK",
+                            headers: {
+                            'ETag': 'TestingETagHeader'
+                            },
+                            method: 'GET',
+                            url: request.url
+                        })
+                  );
+      });
+      self.LibResilientConfig = {
+          plugins: {
+            'reject-all': {}
+          },
+          loggedComponents: [
+              'service-worker'
+          ]
+      }
+      self.LibResilientPlugins.push({
+          name: 'reject-all',
+          description: 'Reject all requests.',
+          version: '0.0.1',
+          fetch: (request, init)=>{ return Promise.reject(request); }
+      })
+      require("../service-worker.js");
+      var response = await self.trigger('fetch', new Request('https://example.com/test.json'))
+      expect(await response.json()).toEqual({ test: "success" })
+  })
+  
   test("making a POST request should work and not go through the plugins", async () => {
       global.fetch.mockImplementation((request, init) => {
           return Promise.resolve(