Improve td.replace error message for incorrect module path

[myoffe]

Calling td.replace with an incorrect module path prints out the following error:

 TypeError: Cannot read property 'join' of undefined
      at requireAt (node_modules/testdouble/lib/replace/module.js:34:32)
      at default_1 (node_modules/testdouble/lib/replace/module.js:15:21)
      at default_1 (node_modules/testdouble/lib/replace/index.js:10:33)
      at Context.beforeEach (app/users/reset-password.test.js:22:12)

It should print something more informative, like the error message from require:

Error: Cannot find module '/incorrect/path/to/module'

Environment

node v8.10.0
testdouble@3.5.2

[searls]

Absolutely agree. Can you give a specific example of what the correct name was and what was wrong? I ask because there are several different failure paths for module replacement and I want to be clear I understand your case

[myoffe]

In my case the failure was caused by replace('./hash'), while the correct path was '../auth/hash'.
This was inside the test file <project root>/app/users/reset-password.test.js

[searls]

This is sort of a dupe of #261 except the message apparently got worse at some point.

[searls]

Landed in 3.8.0