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.
npx agentmods add rules/prisma/prisma-next/no-tautological-testsgit clone --depth 1 https://github.com/prisma/prisma-nextWrote 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.
[](https://agentmods.dev/rules/prisma/prisma-next/no-tautological-tests)<a href="https://agentmods.dev/rules/prisma/prisma-next/no-tautological-tests"><img src="https://agentmods.dev/badge/rules/prisma/prisma-next/no-tautological-tests.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.00260 |
| Opus 5 | $0.00000 | $0.00130 |
| Sonnet 5 | $0.00000 | $0.00052 |
| Haiku 4.5 | $0.00000 | $0.00026 |
Grade A, and why
no-tautological-tests 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 3d 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.
This is a copy
100% identical to no-tautological-tests — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Avoid Tautological Tests
Tests must verify behavior, not mirror object shape passed by the test itself.
Rule
- Prefer assertions that validate transformation, branching, integration behavior, error handling, or side effects.
- Do not add tests that only confirm an object still contains fields copied directly from the test input.
- If coverage pressure encourages low-value assertions, tune coverage configuration instead of adding meaningless tests.
Examples
❌ Avoid
const value = makeThing({ a: 1, b: 2 });
expect(value).toMatchObject({ a: 1, b: 2 });
When makeThing() only stores the same input fields, this adds little signal and mostly tests fixture setup.
✅ Prefer
const value = makeThing({ precision: 12 });
expect(value.normalize()).toBe('numeric(12)');
expect(() => makeThing({ precision: -1 })).toThrow();
These assertions validate behavior and error paths that can actually regress.
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.
- 3d ago First seen · 37 lines · 0 tokens per session scan A 76c7861ddc5b
no-tautological-tests is a cursor rule published in the GitHub repository prisma/prisma-next (419 stars, last pushed 9d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 260 tokens. A static security scan graded it A with 0 findings. It is 100% identical to no-tautological-tests, differing in 0 lines, and is treated as a copy.
Other cursor rules, from other repositories
cli-error-handling
CLI command error handling patterns.
prefer-direct-imports-over-module-mocks
Prefer extracting a testable core over vi.mock / vi.resetModules when unit tests need to reach production logic entangled with config, env, or singletons.
control-plane-descriptors
Control plane descriptor and instance implementation patterns.
family-instance-domain-actions
Family instance domain action implementation patterns.
import-validation
Import validation and package layering rules.
no-target-branches
Never branch on target - use adapters instead.