Adds service worker tests

They're very basic at the moment because service workers a re notoriously hard to test. I've made sure the cache busting is tested though as this is what has the potential to cause the most problems if it fails.

Adds service worker tests
They're very basic at the moment because service workers a re notoriously hard to test. I've made sure the cache busting is tested though as this is what has the potential to cause the most problems if it fails.
b9f3eff1 · samdbeckham · 90b74f61 · b9f3eff1 · b9f3eff1 · b9f3eff1
--- a/package.json
+++ b/package.json
@@ -180,6 +180,7 @@
    "pixelmatch": "^4.0.2",
    "postcss": "^7.0.14",
    "prettier": "1.16.4",
+    "service-worker-mock": "^2.0.0",
    "stylelint": "^9.10.1",
    "stylelint-config-recommended": "^2.1.0",
    "stylelint-scss": "^3.5.4",

--- a/spec/frontend/service_worker_spec.js
+++ b/spec/frontend/service_worker_spec.js
+const makeServiceWorkerEnv = require('service-worker-mock');
+const SERVICE_WORKER_PATH = '~/sw.js';
+
+describe('Service worker', () => {
+  beforeEach(() => {
+    Object.assign(global, makeServiceWorkerEnv());
+    jest.resetModules();
+  });
+
+  it('should delete old caches on activate', () => {
+    require(SERVICE_WORKER_PATH);
+
+    // Create old cache
+    self.caches.open('OLD_CACHE').then(() => {
+      expect(self.snapshot().caches.OLD_CACHE).toBeDefined();
+    });
+
+    // Activate and verify old cache is removed
+    self.trigger('activate').then(() => {
+      expect(self.snapshot().caches.OLD_CACHE).toBeUndefined();
+    });
+  });
+});
--- a/yarn.lock
+++ b/yarn.lock
@@ -3360,6 +3360,13 @@ dom-serializer@0:
    domelementtype "~1.1.1"
    entities "~1.1.1"

+dom-urls@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/dom-urls/-/dom-urls-1.1.0.tgz#001ddf81628cd1e706125c7176f53ccec55d918e"
+  integrity sha1-AB3fgWKM0ecGElxxdvU8zsVdkY4=
+  dependencies:
+    urijs "^1.16.1"
+
 domain-browser@^1.1.1:
  version "1.1.7"
  resolved "https://registry.yarnpkg.com/domain-browser/-/domain-browser-1.1.7.tgz#867aa4b093faa05f1de08c06f4d7b21fdf8698bc"
@@ -9410,6 +9417,16 @@ serve-static@1.13.2:
    parseurl "~1.3.2"
    send "0.16.2"

+service-worker-mock@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/service-worker-mock/-/service-worker-mock-2.0.0.tgz#6a2305a81e74cd5a086d36f49c869830ffbd7554"
+  integrity sha512-78AENCPDpdU6wkrSEAcMV4hSOPdZHSEZmyWV5WfLEw8sg2oT8mbkDaDRkYPCJ60Invw3nsM4YoYIToF32JbBFg==
+  dependencies:
+    dom-urls "^1.1.0"
+    shelving-mock-indexeddb "github:philipwalton/shelving-mock-indexeddb#621b7a275568051846d20e3e557fa1101418b1d1"
+    url-search-params "^0.10.0"
+    w3c-hr-time "^1.0.1"
+
 set-blocking@^2.0.0, set-blocking@~2.0.0:
  version "2.0.0"
  resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
@@ -9495,6 +9512,17 @@ shellwords@^0.1.1:
  resolved "https://registry.yarnpkg.com/shellwords/-/shellwords-0.1.1.tgz#d6b9181c1a48d397324c84871efbcfc73fc0654b"
  integrity sha512-vFwSUfQvqybiICwZY5+DAWIPLKsWO31Q91JSKl3UYv+K5c2QRPzn0qzec6QPu1Qc9eHYItiP3NdJqNVqetYAww==

+shelving-mock-event@^1.0.8:
+  version "1.0.12"
+  resolved "https://registry.yarnpkg.com/shelving-mock-event/-/shelving-mock-event-1.0.12.tgz#401dc90b3b49cbf2a817ecf2dd5a83eff4de2e14"
+  integrity sha512-2F+IZ010rwV3sA/Kd2hnC1vGNycsxeBJmjkXR8+4IOlv5e+Wvj+xH+A8Cv8/Z0lUyCut/HcxSpeDccYTVtnuaQ==
+
+"shelving-mock-indexeddb@github:philipwalton/shelving-mock-indexeddb#621b7a275568051846d20e3e557fa1101418b1d1":
+  version "1.0.5"
+  resolved "https://codeload.github.com/philipwalton/shelving-mock-indexeddb/tar.gz/621b7a275568051846d20e3e557fa1101418b1d1"
+  dependencies:
+    shelving-mock-event "^1.0.8"
+
 sigmund@^1.0.1:
  version "1.0.1"
  resolved "https://registry.yarnpkg.com/sigmund/-/sigmund-1.0.1.tgz#3ff21f198cad2175f9f3b781853fd94d0d19b590"
@@ -10768,6 +10796,11 @@ uri-js@^4.2.2:
  dependencies:
    punycode "^2.1.0"

+urijs@^1.16.1:
+  version "1.19.1"
+  resolved "https://registry.yarnpkg.com/urijs/-/urijs-1.19.1.tgz#5b0ff530c0cbde8386f6342235ba5ca6e995d25a"
+  integrity sha512-xVrGVi94ueCJNrBSTjWqjvtgvl3cyOTThp2zaMaFNGp3F542TR6sM3f2o8RqZl+AwteClSVmoCyt0ka4RjQOQg==
+
 urix@^0.1.0:
  version "0.1.0"
  resolved "https://registry.yarnpkg.com/urix/-/urix-0.1.0.tgz#da937f7a62e21fec1fd18d49b35c2935067a6c72"
@@ -10809,6 +10842,11 @@ url-search-params-polyfill@^5.0.0:
  resolved "https://registry.yarnpkg.com/url-search-params-polyfill/-/url-search-params-polyfill-5.0.0.tgz#09b98337c89dcf6c6a6a0bfeb096f6ba83b7526b"
  integrity sha512-+SCD22QJp4UnqPOI5UTTR0Ljuh8cHbjEf1lIiZrZ8nHTlTixqwVsVQTSfk5vrmDz7N09/Y+ka5jQr0ff35FnQQ==

+url-search-params@^0.10.0:
+  version "0.10.2"
+  resolved "https://registry.yarnpkg.com/url-search-params/-/url-search-params-0.10.2.tgz#e9da69646e48c6140c6732e1f07fb669525f5a4e"
+  integrity sha512-d6GYsr992Bo9rzTZFc9BUw3UFAAg3prE9JGVBgW2TLTbI3rSvg4VDa0BFXHMzKkWbAuhrmaFWpucpRJl+3W7Jg==
+
 url-to-options@^1.0.1:
  version "1.0.1"
  resolved "https://registry.yarnpkg.com/url-to-options/-/url-to-options-1.0.1.tgz#1505a03a289a48cbd7a434efbaeec5055f5633a9"