heroku run node test-email,js
     »   Warning: heroku update available from 7.22.7 to 7.38.1.
    Running node test-email,js on gentle-gorge-04163... starting, run.9979 (Free)
    Running node test-email,js on gentle-gorge-04163... connecting, run.9979 (Free)
    Running node test-email,js on gentle-gorge-04163... up, run.9979 (Free)
    Injecting runtime env into /app/build/static/js/2.e0af0768.chunk.js (from .profile.d/inject_react_app_env.sh)
    Injecting runtime env into /app/build/static/js/main.380e5b93.chunk.js (from .profile.d/inject_react_app_env.sh)
    Injecting runtime env into /app/build/static/js/runtime-main.ea22960d.js (from .profile.d/inject_react_app_env.sh)
    internal/modules/cjs/loader.js:979
      throw err;
      ^

    Error: Cannot find module '/app/test-email,js'
        at Function.Module._resolveFilename (internal/modules/cjs/loader.js:976:15)
        at Function.Module._load (internal/modules/cjs/loader.js:859:27)
        at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
        at internal/main/run_main_module.js:17:47 {
      code: 'MODULE_NOT_FOUND',
      requireStack: []
    }