Tests Fail on Windows based PC

[YourWishes]

Problem

After working with #967 I ran the test and am getting numerous errors, most related to the slash inconsistency in Windows

Refer to https://pastebin.com/6nLnpaPi

Replication steps

1. Pull Slate
2. Run yarn install as normal
3. Run yarn test

More Information

Some cases seem to be related to slashes being / rather than Windows \\, others seem to related to double slash escaping (\\ rather than \\\\)