Move test to gulp instead of npm

.travis.yml

@@ -16,9 +16,9 @@ install:
 script:
   - npm run vscode:prepublish
   - npm run lint
-  - npm run test
+  - gulp test
 
 notifications:
   email:
     on_success: never
-    on_failure: always
+    on_failure: always

gulpfile.js

@@ -9,6 +9,14 @@ const download = require('gulp-download');
 const path = require('path');
 const os = require('os');
 const fse = require('fs-extra');
+const cp = require('child_process');
+
+gulp.task('test', ['install-azure-account'], (cb) => {
+    const cmd = cp.spawn('node', ['./node_modules/vscode/bin/test'], { stdio: 'inherit' });
+    cmd.on('close', (code) => {
+        cb(code);
+    });
+});
 
 gulp.task('install-azure-account', async () => {
     const version = '0.2.2';

package.json

@@ -370,8 +370,7 @@
         "vscode:prepublish": "tsc -p ./",
         "compile": "tsc -watch -p ./",
         "lint": "tslint --project tsconfig.json -e src/*.d.ts -t verbose",
-        "postinstall": "node ./node_modules/vscode/bin/install",
-        "test": "gulp install-azure-account;node ./node_modules/vscode/bin/test"
+        "postinstall": "node ./node_modules/vscode/bin/install"
     },
     "devDependencies": {
         "@types/clipboardy": "^1.1.0",