Add tests for PascalCaseToSnakeCase.
Add tests for PascalCaseToSnakeCase.

limetext/lime-backend,limetext/lime-backend,limetext/lime-backend,codex8/lime-backend,codex8/lime-backend,codex8/lime-backend,limetext/lime-backend,bj7/lime-backend,codex8/lime-backend,bj7/lime-backend,ch1bo/lime-backend,ch1bo/lime-backend,ch1bo/lime-backend,bj7/lime-backend,bj7/lime-backend,limetext/backend,ch1bo/lime-backend