testing

A step-by-step method for writing and checking software tests with devctx tools. Tests are programs that check whether other code behaves as expected.

In plain words
What is it for?
Use it to add tests for a function, discover related tests, identify dependencies such as databases or password libraries, and run the test suite.
Why use it?
It helps find existing testing patterns, identify dependencies to replace or simulate, and verify the result by running the test command.

Cursor rule

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.

agentmods
npx agentmods add rules/arrayo/smart-context-mcp/testing
Clone the repo
git clone --depth 1 https://github.com/Arrayo/smart-context-mcp
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 194 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00000 $0.00194
Opus 5 $0.00000 $0.00097
Sonnet 5 $0.00000 $0.00039
Haiku 4.5 $0.00000 $0.00019

Measured yesterday against content hash 1e37ddce890a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

testing 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 yesterday.

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.

tools/devctx/agent-rules/profiles-compact/testing.mdc · 22 lines

What it actually says

Testing Workflow

1. smart_turn(start, userPrompt='Write tests for validateToken')
2. smart_search(intent=tests, query=<feature>)
   → Find existing test patterns to follow
3. smart_read(mode=symbol, symbol=<function to test>)
   → Extract the function you're testing
4. smart_context(entryFile=<function file>, detail=minimal)
   → Reveals dependencies to mock (jwt, bcrypt, db)
5. [write test]
6. smart_shell('npm test') → verify
7. smart_turn(end, summary='Added 5 tests for validateToken')

Key: Use intent=tests in smart_search to find test patterns. Use smart_context(detail=minimal) to discover dependencies without reading full files.

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. yesterday First seen · 22 lines · 0 tokens per session scan A 1e37ddce890a

Subscribe to this mod's changes

testing is a cursor rule published in the GitHub repository Arrayo/smart-context-mcp (4 stars, last pushed 2mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 194 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 2026-08-31.