Use `expect(pathname).to exist` over `expect(File).to exist(pathname)`
Add pry to assist with debugging
Fix require name
Assert valid options keys to test helper methods
Use Hash#fetch for default values
Prefer `unless foo` over `if !foo`
Always return a string from `expect_shell_sh`
Colourful tests
Reorder tests
Improve example names
Ensure setting FRESH_NO_BIN_CHECK disables check