cache plugin tests: first actual functional test passes (ref. #8)

__tests__/plugins/cache.test.js

@@ -1,4 +1,29 @@
+/**
+ * @jest-environment jsdom
+ */
+
 const makeServiceWorkerEnv = require('service-worker-mock');
+const cache = require('cache-polyfill')
+
+global.fetch = require('node-fetch');
+jest.mock('node-fetch')
+
+global.fetch.mockImplementation((url, init) => {
+          const response = new Response(
+                            new Blob(
+                              [JSON.stringify({ test: "success" })],
+                              {type: "application/json"}
+                            ),
+                            {
+                              status: 200,
+                              statusText: "OK",
+                              headers: {
+                                'ETag': 'TestingETagHeader'
+                              },
+                              url: url
+                            });
+          return Promise.resolve(response);
+        });
 
 describe("plugin: cache", () => {
   beforeEach(() => {
@@ -10,9 +35,32 @@ describe("plugin: cache", () => {
             'cache':{}
         }
     }
+    self.log = function(component, ...items) {
+        console.debug(component + ' :: ', ...items)
+    }
   })
+  
   test("it should register in LibResilientPlugins", () => {
     require("../../plugins/cache.js");
     expect(self.LibResilientPlugins[0].name).toEqual('cache');
   });
+  
+  test("it should stash successfully", () => {
+    require("../../plugins/cache.js");
+    expect.assertions(7);
+    return self.LibResilientPlugins[0].stash('https://resilient.is/test.json').then((result)=>{
+      expect(result).toBe(undefined)
+      return self.LibResilientPlugins[0].fetch('https://resilient.is/test.json')
+    }).then(fetchResult => {
+      expect(fetchResult.status).toEqual(200)
+      expect(fetchResult.statusText).toEqual('OK')
+      expect(fetchResult.url).toEqual('https://resilient.is/test.json')
+      expect(fetchResult.headers.has('Etag')).toEqual(true)
+      expect(fetchResult.headers.get('ETag')).toEqual('TestingETagHeader')
+      return fetchResult.json().then(json => {
+        expect(json).toEqual({ test: "success" })
+      })
+    })
+  });
+  
 });

package-lock.json

@@ -1095,6 +1095,12 @@
       "integrity": "sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ==",
       "dev": true
     },
+    "cache-polyfill": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/cache-polyfill/-/cache-polyfill-1.0.1.tgz",
+      "integrity": "sha512-bIMkvMYuXvOOUMoxUChREYXT6OZi4kvPcRQrmEyaPkLR21sLwDfhdhxxSifZmoiPGQHNEdbeuVNtO5oXbSP31Q==",
+      "dev": true
+    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",

package.json

@@ -1,5 +1,6 @@
 {
   "devDependencies": {
+    "cache-polyfill": "^1.0.1",
     "eslint": "^7.32.0",
     "jest": "^27.0.6",
     "node-fetch": "^2.6.1",

plugins/cache.js

@@ -57,7 +57,7 @@
             .then((cache) => {
                 if (typeof resource === 'string') {
                     // assume URL
-                    self.log(config.name, "caching an URL")
+                    self.log(config.name, "caching an URL: " + resource)
                     return cache.add(resource)
                 } else if (Array.isArray(resource)) {
                     // assume array of URLs