test-gap-analysis

test-gap-analysis is a command for Claude Code from sigistry/marketplace. It costs 13 tokens per session (2,919 once invoked), scanned A, original, MIT.

A command that finds code paths and areas of a codebase without tests. Test coverage measures which parts of a program are exercised by tests.

In plain words
What is it for?
It is for scanning source and test files, matching them, and identifying missing coverage across a project.
Why use it?
It shows where testing is missing, helping developers decide which untested code should be covered first.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the test-generator plugin — 5 commands shipped together

Good fit It is for scanning source and test files, matching them, and identifying missing coverage across a project.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/sigistry/marketplace/test-gap-analysis
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/sigistry/marketplace

Made for: Claude Code.

Or install test-generator, the plugin that ships this one along with the rest of its 5 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for test-gap-analysis

README.md
[![agentmods](https://agentmods.dev/badge/commands/sigistry/marketplace/test-gap-analysis/github.svg)](https://agentmods.dev/commands/sigistry/marketplace/test-gap-analysis)
Your own site
<a href="https://agentmods.dev/commands/sigistry/marketplace/test-gap-analysis"><img src="https://agentmods.dev/badge/commands/sigistry/marketplace/test-gap-analysis/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for test-gap-analysis

Your own site · 80×15
<a href="https://agentmods.dev/commands/sigistry/marketplace/test-gap-analysis"><img src="https://agentmods.dev/badge/commands/sigistry/marketplace/test-gap-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,919 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00013 $0.02919
Opus 5 $0.00006 $0.01460
Sonnet 5 $0.00003 $0.00584
Haiku 4.5 $0.00001 $0.00292

Measured 5d ago against content hash e285687747d1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

test-gap-analysis scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/test-generator/commands/test-gap-analysis.md · 423 lines

How it starts

The opening of the file, as written. The whole thing — 423 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Test Gap Analysis Command

You are tasked with performing a comprehensive analysis of the codebase to identify gaps in test coverage. This analysis will help prioritize testing efforts and ensure critical code is properly tested.

Step 1: Discover the Codebase Structure

Perform a thorough scan of the project:

Identify Source Code

  • Find all source code directories (src/, lib/, app/, etc.)
  • Identify the programming language(s)
  • Map the directory structure
  • List all code files that should have tests

Identify Test Code

  • Find all test directories (tests/, test/, tests/, spec/)
  • Identify test files by naming conventions:
    • *.test.js, *.spec.ts, *_test.py, *_test.go, Test*.java
  • Map test files to their corresponding source files

Identify Testing Framework

  • Detect from package.json, requirements.txt, pom.xml, go.mod
  • Look for: Jest, Pytest, JUnit, Go testing, RSpec, Mocha, etc.

Step 2: Analyze Source Files for Testable Units

For each source file, identify:

Functions and Methods

  • Public functions
  • Exported functions
  • Class methods (public and protected)
  • Utility functions
  • API endpoints/route handlers

Classes

  • Public classes
  • Service classes
  • Repository/DAO classes
  • Controller classes
  • Utility classes

Modules

  • Module exports
  • Public APIs
  • Entry points

Step 3: Map Tests to Source Code

Create a mapping between source and tests:

For Each Source File:

  1. Find corresponding test file

    • Check naming conventions (file.ts → file.test.ts)
    • Check test directories mirroring source structure
    • Search for imports of the source file in test files
  2. Analyze test coverage

    • Which functions/methods have tests?
    • How many tests per function?
    • Are edge cases tested?
    • Are error conditions tested?
  3. Calculate coverage metrics

    • Percentage of functions with at least one test
    • Percentage of lines covered (if coverage data available)
    • Number of test cases per function

Read the full file on GitHub · 423 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 423 lines · 13 tokens per session scan A e285687747d1

Subscribe to this mod's changes

test-gap-analysis is a command published in the GitHub repository sigistry/marketplace (3 stars, last pushed 5d ago), licensed MIT. It adds 13 tokens to every session and 2,919 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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