adding npm smoke test

Author: mansona

.travis.yml

@@ -39,15 +39,15 @@ jobs:
     install: yarn install --no-lockfile
   - name: All Commands Smoke Test
     script:
-    - yarn client-test
+    - npm run client-test
   - name: Node 6 Smoke Test
     node_js: '6'
     script:
-    - yarn smoke-test
+    - npm run smoke-test
   - name: Node 8 Smoke Test
     node_js: '8'
     script:
-    - yarn smoke-test
+    - npm run smoke-test
   - stage: deploy
     if: tag IS present
     node_js: "10"

run-smoke-test.sh

@@ -5,4 +5,4 @@ rm ember-try*.tgz || true
 npm pack
 now=$(date +%s)
 mv ember-try*.tgz "ember-try-${now}.tgz"
-cd smoke-test-app && yarn upgrade "ember-try@file:../ember-try-${now}.tgz" && yarn install && "./${1}"
+cd smoke-test-app && npm i && npm i --save-dev "../ember-try-${now}.tgz" && "./${1}"