Test that require("module") returns Module constructor on the client.

On the server, require("module") returns Node's native Module constructor,
which is not the same as module.constructor in our server JS bundle.

tools/tests/apps/modules/tests.js

@@ -266,6 +266,11 @@ describe("native node_modules", () => {
     require("vm");
     require("zlib");
   });
+
+  Meteor.isClient &&
+  it('should return Module from require("module")', () => {
+    assert.ok(module instanceof require("module"));
+  });
 });
 
 describe("local node_modules", () => {