add dummy unit test

package.json

@@ -10,7 +10,7 @@
     "node": ">=8"
   },
   "scripts": {
-    "acceptance": "lb-dist mocha --opts ../../test/mocha.opts 'DIST/test/acceptance/**/*.js'",
+    "acceptance": "lb-mocha \"DIST/test/acceptance/**/*.js\"",
     "build": "lb-tsc es2017",
     "build:apidocs": "lb-apidocs",
     "lint": "npm run prettier:check && npm run tslint",
@@ -23,9 +23,9 @@
     "clean": "lb-clean loopback-graphql*.tgz dist*",
     "prepare": "npm run build && npm run build:apidocs",
     "pretest": "npm run build",
-    "integration": "lb-dist mocha --opts ../../test/mocha.opts 'DIST/test/integration/**/*.js'",
-    "test": "lb-dist mocha --opts ../../test/mocha.opts 'DIST/test/unit/**/*.js' 'DIST/test/integration/**/*.js' 'DIST/test/acceptance/**/*.js'",
-    "unit": "lb-dist mocha --opts ../../test/mocha.opts 'DIST/test/unit/**/*.js'",
+    "integration": "lb-mocha \"DIST/test/integration/**/*.js\"",
+    "test": "lb-mocha \"DIST/test/unit/**/*.js\" \"DIST/test/integration/**/*.js\" \"DIST/test/acceptance/**/*.js\"",
+    "unit": "lb-mocha \"DIST/test/unit/**/*.js\"",
     "verify": "npm pack && tar xf loopback-graphql*.tgz && tree package && npm run clean"
   },
   "author": "IBM",

test/mocha.opts

@@ -0,0 +1,2 @@
+--recursive
+--reporter dot

test/unit/dummy-test.js

@@ -0,0 +1,7 @@
+import {expect} from '@loopback/testlab';
+
+describe('dummy test - remove me later', () => {
+  it('works', () => {
+    expect(1).to.equal(1);
+  });
+});