What is tdd-patterns?

A Test-Driven Development guide for Delphi using DUnitX, a Delphi testing framework. TDD means writing a failing test first, making it pass, and then improving the code, while external systems are replaced with test doubles.

Use it when creating isolated unit tests for Delphi services and entities. It covers test-first development, fakes and mocks, exception checks, and DUnitX test structure.

It prevents tests from depending on databases, networks, APIs, or forms, which makes failures harder to diagnose and tests slower to run. It also standardizes test names, setup, assertions, and dependency injection.

tdd-patterns — Cursor rule for Cursor by SecondLifes/delphi-expert

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/SecondLifes/delphi-expert

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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/secondlifes/delphi-expert/tdd-patterns/github.svg)](https://agentmods.dev/rules/secondlifes/delphi-expert/tdd-patterns)

Your own site

<a href="https://agentmods.dev/rules/secondlifes/delphi-expert/tdd-patterns"><img src="https://agentmods.dev/badge/rules/secondlifes/delphi-expert/tdd-patterns/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.

Your own site · 80×15

<a href="https://agentmods.dev/rules/secondlifes/delphi-expert/tdd-patterns"><img src="https://agentmods.dev/badge/rules/secondlifes/delphi-expert/tdd-patterns.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 285 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.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00285
Opus 5.5	$0.00000	$0.00114
Sonnet 5.5	$0.00000	$0.00057
Haiku 4.5	$0.00000	$0.00028

Measured 1mo ago against content hash 7cdcf06e7158, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tdd-patterns 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/rules/tdd-patterns.mdc · 13 lines

What it actually says

Delphi TDD and Unit Tests (DUnitX)

Test-First (Red-Green-Refactor): When implementing new rules under "TDD" order, you MUST first structure the Test Case and its failed assertions (Assert), before designing the concrete business logic algorithms.
Expressive Standard Nomenclature: Test method prefixes must follow the Metodo_Cenario_Expectativa semantic scope. Example: [Test] procedure CalculateTax_EmptyOrder_ThrowsException;.
Default Framework: Use DUnitX. Always decorate test classes with [TestFixture], methods with [Test] and setups with [Setup] / [TearDown].
Total Isolation (Fakes/Mocks): NEVER write a unit test that involves direct coupling with the TFDConnection Database, external APIs, Network or VCL/Forms. Everything external to the tested Service or Entity must be simulated in the test file in a FAKE isolated subclass implementing the Dependency Interface (IMyRepository).
Exception Validation: To prove domain Guard Clauses, instantiate anonymous methods using Assert.WillRaise() by injecting the expected type of Exception.

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.

1mo ago First seen · 13 lines · 285 tokens per session scan A 7cdcf06e7158

Subscribe to this mod's changes

tdd-patterns is a cursor rule published in the GitHub repository SecondLifes/delphi-expert (3 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 285 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 2026-09-03.

TDD Testing Unit testing

tdd-patterns

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

Delphi TDD and Unit Tests (DUnitX)

What this file has done since we first saw it

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