Use meteor.{mainModule,testModule} for meteor create starter apps.

In order for Meteor to maintain its commitment to being a
zero-configuration tool, any configuration options that we add must come
pre-configured in the best way possible for newly created apps.

In particular, the default new Meteor app must contain a reasonable
testing story, or else we are signalling to the community that testing is
an afterthought.

With that said, this PR is still a work in progress. I welcome your
feedback on how best to configure the default `meteor create` starter app.

Builds on #9690 and #9714.

tools/static-assets/skel/package.json

@@ -2,10 +2,20 @@
   "name": "~name~",
   "private": true,
   "scripts": {
-    "start": "meteor run"
+    "start": "meteor run",
+    "test": "meteor test --driver-package dispatch:mocha-browser",
+    "test-app": "meteor test --full-app --driver-package dispatch:mocha-browser",
+    "visualize": "meteor --production --extra-packages bundle-visualizer"
   },
   "dependencies": {
-    "@babel/runtime": "^7.0.0-beta.36",
+    "@babel/runtime": "^7.0.0-beta.40",
     "meteor-node-stubs": "^0.3.2"
+  },
+  "meteor": {
+    "mainModule": {
+      "client": "client/main.js",
+      "server": "server/main.js"
+    },
+    "testModule": "test/main.js"
   }
 }

tools/static-assets/skel/test/main.js

@@ -0,0 +1,27 @@
+import assert from "assert";
+
+export const testMessage = "Welcome to Meteor!";
+
+describe("~name~", () => {
+  it("package.json has correct name", () => {
+    const { name } = require("../package.json");
+    assert.strictEqual(name, "~name~");
+  });
+
+  if (Meteor.isClient) {
+    it("client is not server", () => {
+      assert.strictEqual(Meteor.isServer, false);
+    });
+  }
+
+  if (Meteor.isServer) {
+    it("server is not client", () => {
+      assert.strictEqual(Meteor.isClient, false);
+    });
+  }
+
+  it("async/await and dynamic import()", async () => {
+    const tests = await import("./main.js");
+    assert.strictEqual(tests.testMessage, testMessage);
+  });
+});