test(rename): cover no-arg PascalCase derivation from the git remote

[devantler]

🤖 Generated by the Daily AI Assistant

What

Adds a Case 4 to scripts/rename-placeholders.test.sh that exercises the script's no-argument path — deriving a PascalCase project name from origin's GitHub remote.

Why

rename-placeholders.sh is the first thing a newcomer runs after Use this template, and running it with no argument is its documented default:

With no argument it derives a PascalCase name from origin's GitHub repo name.

That branch carries real, easy-to-break logic — URL parsing plus the awk segment-split/capitalise (my-cool-app → MyCoolApp) — yet every existing test case passes an explicit name (Widget, Acme.Widget, …), so the entire derivation branch was unexercised. A regression there ships a wrongly-named scaffold to anyone who runs the default.

What the new case pins

• 4a — https remote, separator/dot collapse: https://github.com/acme/my--cool.app.git → MyCoolApp (doubled - and the . collapse to a single token); asserts the .slnx/src/ rename and the repointed namespace, and that the Example original is gone.
• 4b — scp-style remote: git@github.com:acme/widget-svc.git → WidgetSvc (proves the git@host:owner/repo.git form derives identically).

make_copy() inits a git repo with no remote, so each sub-case adds its own origin. No build is run in the new cases (Case 2 already covers build/test); the cleanup trap is extended to the two new throwaway copies.

Validation

• sh scripts/rename-placeholders.test.sh → PASS (all 4 cases; build/test still green).
• Mutation-checked (non-vacuous): dropping toupper() from the awk derivation makes the script emit mycoolapp and Case 4a fails as expected; restored.
• shellcheck -s sh clean. Test-only change — rename-placeholders.sh is untouched.

The go-template rename script has the same untested derive-from-remote branch (module-path parsing); a sibling PR will cover it.