[1.7.0.2] In newly created app, `meteor npm test` runs no tests

[benjamn]

Steps to reproduce:

% meteor create new-app
% cd new-app
% meteor npm test

> new-app@ test /Users/ben/dev/new-app
> meteor test --once --driver-package meteortesting:mocha

[[[[[ Tests ]]]]]                             

=> Started proxy.                             
=> Started MongoDB.                           
I20180613-17:13:22.327(-4)?                   
I20180613-17:13:22.350(-4)? --------------------------------
I20180613-17:13:22.351(-4)? ----- RUNNING SERVER TESTS -----
I20180613-17:13:22.351(-4)? --------------------------------
I20180613-17:13:22.351(-4)? 
I20180613-17:13:22.351(-4)? 
I20180613-17:13:22.351(-4)? 
I20180613-17:13:22.352(-4)?   0 passing (1ms)
I20180613-17:13:22.352(-4)? 
I20180613-17:13:22.352(-4)? Load the app in a browser to run client tests, or set the TEST_BROWSER_DRIVER environment variable. See https://github.com/meteortesting/meteor-mocha/blob/master/README.md#run-app-tests
=> Started your app.

=> App running at: http://localhost:3000/
%

Workaround: rename the tests directory to test and update meteor.testModule in package.json.

Likely related: #9977