Added tests for empty volume paths

[kastolars]

Proposed Changes

Issue + Comment: #51 (comment)

Type of Change

• Bug Fix
• Feature
• Documentation
• Repository Enhancement
• Testing

Checklist

Before the Pull Request can be considered for merging, the following Checklist should have the corresponding fields completed:

• All tests have passed locally after running go test ./...
• I have added tests that prove my fix or feature works as expected
• I have added any necessary documentation for my fix or feature

Comments

I had to come up with a MockUtility function to simulate a Getwd error because otherwise supplying an empty string for the path still succeeds.

This will push run_sc up to 98.4% coverage

[everettraven]

Looks great @kastolars ! Thanks for the contribution! You've helped a ton with improving the test coverage!