experiments: Cursor rule for Cursor

.cursor/deprecated/testing-and-development.mdc

testing-and-development is a cursor rule for Cursor from reliverse/experiments. It costs 0 tokens per session (855 once invoked), scanned A, original, MIT.

Development and testing rules for the Rempts command-line framework, including Bun's test runner, test file placement, command-test helpers, and how to test flags and positional arguments. Tests are checks that verify code behaves as expected.

In plain words
What is it for?
Use it when writing or reviewing tests for Rempts commands, checking exit codes and output, testing input arguments, or verifying plugin behavior.
Why use it?
It standardizes how commands are tested and prevents common mistakes, such as passing flags and positional arguments in the wrong places. It also provides patterns for testing plugin context and command results.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/.

This is reliverse/experiments's own configuration. It tells Cursor how to work on experiments itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything experiments configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is import { myPlugin } from '../src'.

Reuse

Borrowing it

Nothing to install: this file belongs to reliverse/experiments. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/reliverse/experiments/main/.cursor/deprecated/testing-and-development.mdc
Clone the repo
git clone --depth 1 https://github.com/reliverse/experiments

Made for: Cursor.

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 testing-and-development

README.md
[![agentmods](https://agentmods.dev/badge/rules/reliverse/experiments/testing-and-development/github.svg)](https://agentmods.dev/rules/reliverse/experiments/testing-and-development)
Your own site
<a href="https://agentmods.dev/rules/reliverse/experiments/testing-and-development"><img src="https://agentmods.dev/badge/rules/reliverse/experiments/testing-and-development/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 testing-and-development

Your own site · 80×15
<a href="https://agentmods.dev/rules/reliverse/experiments/testing-and-development"><img src="https://agentmods.dev/badge/rules/reliverse/experiments/testing-and-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 855 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 $0.00000 $0.00855
Opus 5.5 $0.00000 $0.00342
Sonnet 5.5 $0.00000 $0.00171
Haiku 4.5 $0.00000 $0.00085

Measured 1mo ago against content hash c0472798f6e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

testing-and-development 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 1mo 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.

.cursor/deprecated/testing-and-development.mdc · 124 lines

How it starts

The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Testing and Development Workflow

Guidelines for testing and development practices in the Rempts CLI framework.

Testing Framework

  • Use Bun's built-in test runner with bun test
  • Test files should have .test.ts suffix in test/ directories
  • Use testing utilities from packages/test/ for CLI-specific testing

Test Structure

// Example test file structure
import { describe, it, expect } from 'bun:test'
import { testCommand } from '@reliverse/rempts-test'
import { myCommand } from '../src/commands/my-command.js'

describe('My Command', () => {
  it('should execute successfully', async () => {
    const result = await testCommand(myCommand, {
      flags: { input: 'test' }  // Note: use 'flags', not 'args'
    })
    
    expect(result.exitCode).toBe(0)
    expect(result.stdout).toContain('success')
  })
  
  it('should handle positional arguments', async () => {
    const result = await testCommand(myCommand, {
      flags: { verbose: true },
      args: ['file1.txt', 'file2.txt']  // 'args' is for positional arguments
    })
    
    expect(result.stdout).toContain('file1.txt')
  })
  
  it('should handle plugin context', async () => {
    const result = await testCommand(myCommand, {
      flags: { verbose: true },
      context: {
        store: {
          someData: 'test data'
        }
      }
    })
    
    expect(result.stdout).toContain('test data')
  })
})

Testing Patterns

Development Commands

From the root directory:

  • bun dev - Start development mode with watch
  • bun test - Run all tests
  • bun run build - Build all packages
  • bun run clean - Clean build artifacts

Read the full file on GitHub · 124 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. 1mo ago First seen · 124 lines · 0 tokens per session scan A c0472798f6e9

Subscribe to this mod's changes

testing-and-development is a cursor rule published in the GitHub repository reliverse/experiments (117 stars, last pushed 7mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 855 tokens. 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 2026-09-01.