Coverage is not reported accurately when filename is similar to the folder name

Created by: MrHus

Description

When I run npm test -- --coverage some files report zero coverage, even though they have tests.

Here is the output:

-------------------------------------------|----------|----------|----------|----------|----------------|
File                                       |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
-------------------------------------------|----------|----------|----------|----------|----------------|
All files                                  |    91.94 |    71.43 |    93.02 |    92.43 |                |
 src/shared/Pager                          |        0 |        0 |        0 |        0 |                |
  Pager.js                                 |        0 |        0 |        0 |        0 |... 40,41,46,47 |
-------------------------------------------|----------|----------|----------|----------|----------------|

It would seem that the Pager Component is not tested at all. However it is fully tested. Here is the strange thing, when I alter the Pager.js file in anyway, such as entering another blank line or leaving a comment, it will report the following:

-------------------------------------------|----------|----------|----------|----------|----------------|
File                                       |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
-------------------------------------------|----------|----------|----------|----------|----------------|
All files                                  |      100 |      100 |      100 |      100 |                |
 src/shared/Pager                          |      100 |      100 |      100 |      100 |                |
  Pager.js                                 |      100 |      100 |      100 |      100 |                |
-------------------------------------------|----------|----------|----------|----------|----------------|

Things I've tried, without success:

1. Removing the coverage folder.
2. Commiting all changes in git so the staging is clear.
3. Altering the Pager.test.js file.

So far the only solution is changing Pager.js.

Environment

Run these commands in the project folder and fill in their results:

1. npm ls react-scripts (if you haven’t ejected): react-scripts@0.9.0
2. node -v: 7.5.0
3. npm -v: 4.1.2

Then, specify:

1. Operating system: macOs Sierra 10.12.3
2. Browser and version: Not applicable since it is ran inside the terminal

Here's the code for both files: https://gist.github.com/MrHus/add9acb6dee727a494897706570afe12