ci: cahe cypress travis install faster

Author: elevatebart

.travis.yml

@@ -6,12 +6,18 @@ addons:
     packages:
       - libgconf-2-4
 
+cache:
+  # cache both npm modules and Cypress binary
+  directories:
+    - ~/.npm
+    - ~/.cache
+  override:
+    - npm ci
+    - npm run cy:verify
+
 node_js:
   - lts/*
 
-install:
-  - npm ci
-
 # In order to avoid double build on pull requests,
 # only build on pushes on master and on pushes on pull requests
 branches:

package.json

@@ -9,7 +9,8 @@
     "build:demo": "vue-cli-service build",
     "start": "vue-cli-service serve",
     "test:e2e": "vue-cli-service test:e2e",
-    "test:unit": "vue-cli-service test:unit"
+    "test:unit": "vue-cli-service test:unit",
+    "cy:verify": "cypress verify"
   },
   "dependencies": {
     "core-js": "^2.6.5",