Jest
JavaScript testing framework by Meta
JS/TS
—
Overall Rank
Not in top 20
4.1%
Pick Rate
7 of 171 (CI: 2–8.2%)
7
Primary Picks
of 171 extractable
31
Alt Picks
also mentioned 12x
Strong Default
Category Tier
59.1% winner dominance
In Testing
Full comparison →Vitest101/171 (59.1%) CI: 51.6–66.2%
pytest44/171 (25.7%) CI: 19.8–32.8%
Playwright18/171 (10.5%) CI: 6.8–16%
Jest7/171 (4.1%) CI: 2–8.2%
By Model
Sonnet 4.5
28.6%
avg across repos
Opus 4.5
13.3%
avg across repos
Opus 4.6
6.7%
avg across repos
Per-Repo Breakdown
| Repo | Stack | Sonnet | Opus 4.5 | Opus 4.6 |
|---|---|---|---|---|
TaskFlowJS/TS | Next.js 14, TypeScript, App Router | 28.6% | 13.3% | 6.7% |
Key Insight
Vitest is the default for JavaScript (61-80% across models); pytest is unanimous in Python (100%). Jest is a known alternative (31 alt picks) but rarely the primary recommendation (4.1%).
Frequently Asked Questions
- Does Claude Code recommend Jest?
- Jest appears in 4.1% of Testing responses. The category leader is Vitest at 59.1%.
- What testing tool does Claude Code prefer?
- Vitest leads at 59.1%. The category is classified as "Strong Default" (50–75% dominance). Other options include pytest (25.7%) and Playwright (10.5%).
- How do different Claude models compare on Jest?
- Across repos, Sonnet 4.5 averages 28.6%, Opus 4.5 averages 13.3%, and Opus 4.6 averages 6.7% for Jest.