[Refactoring] Split src/cloud-hypervisor-runtime-backend.test.ts and de-duplicate repeated describe blocks

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Refactoring Opportunity

Summary

• File: src/cloud-hypervisor-runtime-backend.test.ts
• Current size: 1,016 lines (9 describe blocks, 34 it cases)
• Responsibilities identified: startup/preflight, execution/cancellation, readiness probing, and diagnostics/cleanup — and the latter three each appear as duplicated, repeated describe blocks at different points in the file

Evidence

172:describe('Cloud Hypervisor runtime backend', () => {
184:  describe('startup and preflight', () => {
490:  describe('execution and cancellation', () => {
523:  describe('readiness probing', () => {
595:  describe('diagnostics and cleanup', () => {
656:  describe('readiness probing', () => {
756:  describe('diagnostics and cleanup', () => {
850:  describe('readiness probing', () => {
897:  describe('execution and cancellation', () => {

Note readiness probing appears 3 times (523, 656, 850), diagnostics and cleanup appears twice (595, 756), and execution and cancellation appears twice (490, 897) — a strong signal that related cases were appended incrementally rather than grouped, making it hard to find all tests for a given behavior (e.g. diagnostics-collection-once-only semantics at line 595 vs. 756 are easy to miss as duplicates/near-duplicates when scanning).

Proposed Split

• src/cloud-hypervisor/runtime-backend-startup.test.ts — startup and preflight (~300 lines)
• src/cloud-hypervisor/runtime-backend-execution.test.ts — merged execution and cancellation cases (~140 lines)
• src/cloud-hypervisor/runtime-backend-readiness.test.ts — merged readiness probing cases, consolidating the 3 scattered blocks into one (~300 lines)
• src/cloud-hypervisor/runtime-backend-diagnostics.test.ts — merged diagnostics and cleanup cases, consolidating the 2 scattered blocks into one (~260 lines)

Consolidating the repeated describe names during the split also removes the risk of near-duplicate test cases silently diverging (e.g. the two diagnostics and cleanup blocks both cover collect-once-after-teardown semantics per the regression comments at lines 595-650).

Affected Callers

Test-only file for src/cloud-hypervisor/runtime-backend.ts. No production import paths change.

Effort Estimate

Medium

Benefits

• Eliminates duplicate/scattered describe names, making it obvious where all tests for a behavior live
• Smaller, single-purpose files are easier to run in isolation (--testPathPattern=runtime-backend-readiness)
• Reduces risk of accidentally re-adding a near-duplicate regression test because the existing one wasn't visible

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Detected by Refactoring Scanner workflow.

Generated by Refactoring Opportunity Scanner · copilot · auto · 74.7 AIC · ⊞ 10.8K · ◷

• expires on Nov 26, 2026, 3:06 PM UTC

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