Engineering

Test Generation Agent

Reads your code and writes unit, integration, and end-to-end tests that actually cover the risky paths.

Features

5

Tech

11

Steps

5

AI Agent

Test Generation Agent

Production-readyObservable
OpenAI GPT-5
Anthropic Claude 4.7
Vitest

Capabilities

What this agent does

Every capability is shipped end-to-end — not a feature flag. You get a working slice on day one and we expand from there.

Feature 01

Coverage-aware

Focuses on uncovered branches and risky inputs.

Feature 02

Edge case generation

Mutation-based reasoning produces real edge cases.

Feature 03

E2E flow capture

Watches the app + writes Playwright suites.

Feature 04

Flaky test repair

Identifies and stabilises flaky tests automatically.

Feature 05

CI integration

PR-based test contributions, gated by review.

Stack

11 technologies we use

Production-tested tools chosen for reliability, observability, and developer velocity. Every piece is swappable.

OpenAI GPT-5Anthropic Claude 4.7VitestJestPlaywrightCypresspytestJUnitGitHub APICodecovTree-sitter

System at a glance

How the agent flows

A simplified view of what comes in, what the agent does with it, and what it produces. Each arrow is observable end-to-end.

Inputs

Code changeIssue / alertRepo + logs context

Agent

Test Generation Agent

Plan → tool-call → reflect, with approval gates.

Tools the agent calls

OpenAI GPT-5Anthropic Claude 4.7VitestJestPlaywrightCypress+5 more

Outputs

PR commentAuto-fix patchRunbook execution
Every step traced in Langfuse / Braintrust · cost + latency monitored · full replay on failure · human-in-the-loop where it matters

Engagement

How we roll it out

A 5-step process from kickoff to handover. Every step has a deliverable you can sign off on.

  1. 01

    Coverage baseline

    Measure current coverage and identify danger zones.

  2. 02

    Test style intake

    Match your existing fixture and assertion patterns.

  3. 03

    Generate + review

    First batch of tests opens as a PR for engineer review.

  4. 04

    Iterative coverage

    Weekly cadence of new test PRs targeting uncovered code.

  5. 05

    Flake hunting

    Quarterly sweep to eliminate flaky CI red.

Outcomes

What you can expect

Real numbers we see when Test Generation Agent ships on top of an actual workflow. Specifics vary with starting baseline, data quality, and scope — but these are the ranges.

Outcome 01

−35%

PR cycle time

Reviews land in minutes; trivial issues auto-fixed.

Outcome 02

+40%

Bug catch rate

Pre-merge, vs the previous review process alone.

Outcome 03

−50%

MTTR

Mean time to resolve incidents after agent investigates first.

Sample use cases

What this looks like in practice

Three concrete scenarios where teams deploy Test Generation Agent today. Your engagement starts with one of these (or your own variant) and expands from there.

01

Always-on senior reviewer

Every PR gets an inline review for bugs, security, breaking changes — junior engineers ship safer code, seniors spend review time on architecture.

02

First-responder on every page

When PagerDuty fires, the agent correlates logs + metrics + recent deploys, drafts the incident summary, runs read-only diagnostics, posts to Slack.

03

Migration at scale

Framework or major-version upgrade across hundreds of files — agent applies AST codemods, fixes the edge cases LLM-style, opens reviewable PRs per module.

Typical engagement

From kickoff to live in 4-8 weeks

Most Test Generation Agent engagements follow this shape. We give you a firm quote after a 30-minute scoping call, and the price is fixed up-front so you can budget.

2-3 weeks

Pilot

  • Discovery + playbook write-up
  • Tool design + guardrails
  • Eval suite + sandbox deploy
Core

2-4 weeks

Production

  • Hardened deploy on your stack
  • Observability dashboard + alerts
  • Two-week supervised mode

Ongoing

Handover & support

  • Runbook + team training
  • Monthly tuning + eval review
  • Pause or expand any time

Indicative range

$3,000 — $8,000

Full project, scoped + fixed up-front. Includes pilot, production, and 30 days of post-launch support.

Or hire us by the week

from $1,000/wk

Embedded retainer — best for evolving scopes.

Ready to ship Test Generation Agent?

Tell us about your data, your tools, and what success looks like. We come back within one business day with a clear plan, price, and timeline.

Get started

Ready to ship the software your business actually runs on?

Tell us what you're building. We respond within one business day with a clear plan, price, and timeline.

16 industry CRMs shipped96+ clients · 14 countriesRemote-first · Global delivery