Recommendation
Use GitHub Copilot in-editor to draft PR descriptions and generate test scaffolds, but gate all AI outputs with lightweight local hooks and CI checks. Keep two verification layers: fast local sanity checks (pre-push) that run on changed files, and full CI checks (required status checks) that run the whole suite and coverage rules before merge.

Why this works
- Fast feedback prevents noisy CI usage and speeds developer flow.
- Full CI enforces quality and prevents bad/flake-prone tests from reaching main.
- Automated static checks stop obvious weak test patterns before a human sees them.

Decision criteria (choose based on team/budget/scale)
- Team size & velocity: smaller teams can rely more on manual review; larger teams need stricter automation.
- Budget & infra: more CI minutes allow frequent full-suite runs; if limited, invest in changed-files test runs + caches.
- Skill level: junior-heavy teams should require more strict checks + templates; senior-heavy teams can be lighter.
- Output quality need: high-SLA services need coverage gates and flake detection; internal tools can be more permissive.

Practical checklist (developer + repo setup)
1) Editor / Copilot usage
- Create prompt templates for PR body and test scaffolding (intent, inputs, expected outputs, example calls). Use Copilot to fill but always edit.
- Add file templates (e.g., tests/xxx_test.py) with TODO areas and example asserts so Copilot scaffolds against them.

2) Pre-commit / pre-push hooks (fast local sanity)
- Install pre-commit (or husky for JS). Hook runs: formatter, typecheck, linter, and changed-file test runner.
- Compute changed files: git diff --name-only origin/main...HEAD. Feed to test runner: Jest --findRelatedTests or pass file list to pytest. If none, run a small smoke suite.
- Add quick static checks to reject clearly useless tests: grep for patterns like "assert True", lone "pass" in test files, TODO-only bodies, or presence of live-network calls unless annotated.

3) CI jobs and gates
- Job A (fast-pr): lint, typecheck, changed-files tests, unit smoke tests, coverage delta check (fail if coverage drops > X%). Run on every PR comment/update.
- Job B (full-suite): run full unit/integration matrix, flake detection (allow one rerun but mark flakey), and report coverage. Required to merge.
- Use caching (pip/npm) and test parallelization to reduce minutes.

4) Guardrails to prevent bad tests
- Static test linter rules: forbid trivial asserts, forbid sleep()/time-dependent code or require freeze_time decorator.
- Label network/slow tests as "integration" and require a flag env to run; local hooks must skip them.
- Detect empty/mocked-out tests and block PR with clear error messages.
- Require meaningful assertions: search for tests that only assert a single generated value without edge-case checks.
- Track flakiness: rerun failing tests on CI once; if failure rate > threshold, block merge and open an investigation ticket.

Reviewer + process items
- PR template must include a short, edited Copilot PR description and an explicit test strategy section.
- Require at least one reviewer to verify new tests are deterministic and meaningful. For critical areas, require senior sign-off.

Best-for / Avoid-if
- Best for teams wanting faster authoring and repeatable checks with low CI waste.
- Avoid if you cannot enforce CI status checks or if you lack resources to run full-suite regularly.

Optional tool note
- Use GitHub Copilot in-editor to speed drafts and scaffolds, but treat its output as a first draft—add the hooks above to keep quality high.

Quick starter checklist (copy into README)
- Add pre-commit + changed-file test hook
- Add CI fast-pr + full-suite jobs
- Add static test-lint rules (no assert True/pass, no unmarked network calls)
- Add PR template that includes edited Copilot description and test strategy
- Enforce coverage delta and flake thresholds

If you want, I can produce: a pre-commit config + example hook script that finds changed files and invokes pytest/jest, and a short PR-template + static-grep rules for rejecting trivial tests.

Compare GitHub Copilot and Cursor