chore: migrate to busted api

[sand4rt]

No description provided.

[Copilot]

Copilot review overview

🟢 Approval recommended

The reviewed changes preserve existing coverage and have no unresolved blocking issues.

Review effort: Lite
Findings: None

What changed in this PR

Migrates the test suite from MiniTest set registration to Busted-style APIs.

Changes:

• Converts tests to describe/it blocks and lifecycle hooks.
• Enables Busted API emulation in the test bootstrap.
• Preserves existing test coverage.

File	Description
tests/​test_tabs.lua	Migrates tab tests.
tests/​test_splits.lua	Migrates split tests.
tests/​test_resizing.lua	Migrates resizing tests.
tests/​test_integrations.lua	Migrates integration tests.
tests/​test_autocmd.lua	Migrates autocmd tests.
tests/​scripts/​minimal_init.lua	Enables Busted-style collection.

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[sand4rt]

@copilot please fix the merge conflicts in this pull request.

[Copilot]

@copilot please fix the merge conflicts in this pull request.

Done — I merged main into this branch, resolved the conflicts, and pushed the fix in commit cdaf669.

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review issues were identified.

Review effort: Lite
Findings: None

[Copilot]

Copilot review overview

🔵 Needs a closer look

Restore the creation guard on all exit paths to prevent subsequent user splits from being skipped.

Review effort: Lite
Findings: None

Previously missed (1)

In code that hasn't changed since last review

Reset window creation guard when create_window errors

lua/​zen/​init.lua:48

This flag is cleared only on the successful path through create_window. If vnew, a window option update, or a buffer option update raises, it remains true; every subsequent WinNew callback then returns at line 571, so normal user splits stop closing the side buffers. Restore the flag in protected cleanup (for example, an xpcall/finally-style wrapper) on all exits.