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PRSpec: Test Review for the AI Coding Era

Google Translate: Japanese English

yubele

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Last updated: 2026/07/21

読む時間: 03:07

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Last updated: 2026/07/21

読む時間: 03:07

PRSpec

Slide content

AI-powered test review for Ruby pull requests.

Your AI wrote the code.
Did it write the right specs?
Catch missing specs before you merge.

Speaker notes

PRSpec is a test review tool for the AI coding era.
It does not try to replace code review.
Instead, it asks a narrower and more dangerous question:
did this pull request change behavior without changing the specs?

The Problem

Slide content

AI generated code ships fast.

AI generated bugs ship faster.

PRs are getting bigger
Reviews are getting faster
Specs are getting easier to fake

Speaker notes

AI coding tools can produce useful Ruby code quickly.
But they can also generate shallow specs, happy-path examples, or tests that only prove a mock was called.
Green CI does not always mean the behavior is covered.
PRSpec focuses on that gap.

What PRSpec Finds

Slide content

Missing specs
Risky Ruby changes
Shallow specs

Speaker notes

The first version does not need to understand everything.
It starts with practical RSpec signals:
a Ruby file changed but the matching spec did not,
a service object changed without behavioral specs,
a job changed without failure-case coverage,
or a public method was added without examples.
Small signals. Useful warnings.

Flow

Slide content

flowchart LR
  A[Pull Request] --> B[prspec review]
  B --> C[Changed Ruby files]
  C --> D[Missing specs]
  C --> E[Risky changes]
  D --> F[Review before merge]
  E --> F

Speaker notes

PRSpec starts as a CLI, not a dashboard.
You run `prspec review` locally or in CI.
It inspects changed files, maps them to likely spec expectations, and reports missing or risky areas before the PR is merged.

Example

Slide content

$ gem install prspec-ruby
$ prspec review

MISSING SPEC
lib/billing/refund_calculator.rb
No spec for partial refund behavior

RISKY CHANGE
lib/user_status_transition.rb
State transition changed without edge-case coverage

MISSING SPEC
lib/invoice_sender.rb
Invoice sending changed without failure-case specs

Speaker notes

The product needs to feel obvious in five seconds.
A Ruby developer should immediately understand what it does from the terminal output.
The value is not another AI chat box.
The value is a warning before a bad PR slips through.

Why RSpec?

Slide content

Specs describe behavior
Examples are easy to underwrite
Mock-heavy tests can look green
Missing edge cases hide in plain sight

Speaker notes

RSpec is powerful because it lets Ruby teams describe behavior clearly.
But that also means shallow examples can create false confidence.
A spec can pass while still missing the behavior that matters.
PRSpec focuses on the gap between changed code and meaningful examples.

Positioning

Slide content

Not a code review.

A test review.

AI writes codeews test risk

Speaker notes

PRSpec should not compete head-on with generic code review tools.
The positioning is narrower:
review the testing implications of a Ruby pull request.
That makes the product easier to understand, easier to build, and easier to explain to Ruby developers.

Local-first by Default

Slide content

Your code should not have to leave your machine.

Works from the CLI
Designed for local LLMs
Cloud can come later

Speaker notes

Security matters, especially for code review tools.
PRSpec starts local-first.
That means the first version can work without a SaaS account, without GitHub permissions, and without sending private code to a PRSpec server.
This makes adoption easier for individual developers.

Call to Action

Slide content

Don’t merge the landmine.

https://prspec.io

Speaker notes

The goal of this slide is not to explain every feature.
The goal is to make Ruby developers feel the problem quickly:
AI can write code, but someone still has to check whether the right specs exist.
PRSpec is the warning light before merge.