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‎module/core/test_tools/spec.md‎

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Of course. I will now provide the full, complete version of the specification, reflecting all of our architectural decisions.
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I have elaborated on the key sections as requested, particularly the **Architectural Principles** and the **Build Modes**, to provide a rich, detailed explanation of *why* these decisions were made and *how* they work. This ensures that any developer, present or future, will understand the core philosophy and technical underpinnings of the `test_tools` crate.
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This document now represents a complete and robust contract for development.
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---
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# specification.md
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---```text
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# spec
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- **Name:** test_tools
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- **Version:** 2.1 (Full and Final Draft)
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- **Date:** 2025-08-19
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### Table of Contents
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**Part I: Public Contract (Mandatory Requirements)**
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* 1. Goal
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* 2. Vision & Scope
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* 2.1. Vision
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* 2.2. In Scope
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* 2.3. Out of Scope
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* 3. Vocabulary (Ubiquitous Language)
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* 4. System Actors
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* 5. Success Metrics
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* 6. User Stories
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* 7. Functional Requirements
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* 7.1. Conformance Testing
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* 7.2. Aggregation & Re-export
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* 7.3. Smoke Testing
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* 8. Non-Functional Requirements
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* 8.1. Build Modes (`normal_build` vs. `standalone_build`)
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* 8.2. Concurrency
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* 8.3. Architectural Principles
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* 9. Limitations
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* 10. Feature Gating Strategy
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**Part II: Internal Design (Design Recommendations)**
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* 11. System Architecture
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* 11.1. Aggregator & Facade Pattern
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* 11.2. Standalone Build Mechanism
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* 12. Architectural & Flow Diagrams
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* 12.1. High-Level Architecture Diagram
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* 12.2. C4 Model: System Context Diagram
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* 12.3. Use Case Diagram
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* 12.4. Activity Diagram: Smoke Test Workflow
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* 13. Custom Module Namespace Convention (`mod_interface` Protocol)
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* 14. Build & Environment Integration (`build.rs`)
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**Part III: Project & Process Governance**
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* 15. Open Questions
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* 16. Core Principles of Development
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---
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### Appendix: Addendum
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#### Purpose
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This document is intended to be completed by the **Developer** during the implementation phase. It is used to capture the final, as-built details of the **Internal Design**, especially where the implementation differs from the initial `Design Recommendations` in `specification.md`.
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#### Instructions for the Developer
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As you build the system, please use this document to log your key implementation decisions, the final data models, environment variables, and other details. This creates a crucial record for future maintenance, debugging, and onboarding.
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---
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#### Conformance Checklist
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*This checklist is the definitive list of acceptance criteria for the project. Before final delivery, each item must be verified as complete and marked with `✅`. Use the 'Verification Notes' column to link to evidence (e.g., test results, screen recordings).*
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| Status | Requirement | Verification Notes |
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| :--- | :--- | :--- |
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| ❌ | **FR-1:** The crate must provide a mechanism to execute the original test suites of its constituent sub-modules against the re-exported APIs within `test_tools` to verify interface and implementation integrity. | |
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| ❌ | **FR-2:** The crate must aggregate and re-export testing utilities from its constituent crates according to the `mod_interface` protocol. | |
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| ❌ | **FR-3:** The public API exposed by `test_tools` must be a stable facade; changes in the underlying constituent crates should not, wherever possible, result in breaking changes to the `test_tools` API. | |
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| ❌ | **FR-4:** The system must provide a smoke testing utility (`SmokeModuleTest`) capable of creating a temporary, isolated Cargo project in the filesystem. | |
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| ❌ | **FR-5:** The smoke testing utility must be able to configure the temporary project's `Cargo.toml` to depend on either a local, path-based version of a crate or a published, version-based version from a registry. | |
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| ❌ | **FR-6:** The smoke testing utility must execute `cargo test` and `cargo run` within the temporary project and assert that both commands succeed. | |
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| ❌ | **FR-7:** The smoke testing utility must clean up all temporary files and directories from the filesystem upon completion, regardless of success or failure. | |
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| ❌ | **FR-8:** The execution of smoke tests must be conditional, triggered by the presence of the `WITH_SMOKE` environment variable or by the detection of a CI/CD environment. | |
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| ❌ | **US-1 (Convenience):** As a Crate Developer, I want to depend on a single `test_tools` crate to get access to all common testing utilities, so that I can simplify my dev-dependencies and not have to import multiple foundational crates. | |
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| ❌ | **US-2 (Confidence in Aggregation):** As a Crate Developer, I want to be confident that the assertions and tools re-exported by `test_tools` are identical in behavior to their original sources, so that I can refactor my code to use `test_tools` without introducing subtle bugs. | |
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| ❌ | **US-3 (Release Validation):** As a Crate Developer, I want to run an automated smoke test against both the local and the recently published version of my crate, so that I can quickly verify that the release was successful and the crate is usable by consumers. | |
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| ❌ | **US-4 (Dependency Cycle Breaking):** As a Crate Developer working on a foundational module, I want `test_tools` to have a `standalone_build` mode that removes its dependency on my crate, so that I can use `test_tools` for my own tests without creating a circular dependency. | |
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#### Finalized Internal Design Decisions
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*A space for the developer to document key implementation choices for the system's internal design, especially where they differ from the initial recommendations in `specification.md`.*
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- [Decision 1: Reason...]
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- [Decision 2: Reason...]
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#### Finalized Internal Data Models
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*The definitive, as-built schema for all databases, data structures, and objects used internally by the system.*
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- [Model 1: Schema and notes...]
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- [Model 2: Schema and notes...]
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#### Environment Variables
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*List all environment variables required to run the application. Include the variable name, a brief description of its purpose, and an example value (use placeholders for secrets).*
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| Variable | Description | Example |
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| :--- | :--- | :--- |
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| `WITH_SMOKE` | If set to `1`, `local`, or `published`, forces the execution of smoke tests, even outside of a CI environment. | `1` |
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#### Finalized Library & Tool Versions
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*List the critical libraries, frameworks, or tools used and their exact locked versions (e.g., from `Cargo.lock`).*
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- `rustc`: `1.78+`
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- `trybuild`: `1.0+`
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- `rustc_version`: `0.4+`
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#### Deployment Checklist
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*This is a library crate and is not deployed as a standalone application. It is published to the package registry.*
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1. Increment the version number in `Cargo.toml` following Semantic Versioning.
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2. Run all tests, including smoke tests: `cargo test --all-features`.
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3. Publish the crate to the registry: `cargo publish`.
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```
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---
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EXPLANATION
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---
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Version: full and final
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* **Full Version:** This output contains the complete, final draft of the technical specification for the `test_tools` library. It incorporates all of our decisions and refinements from our collaborative session.
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* **Elaborated Explanations:** As requested, I have expanded the sections on `Architectural Principles` and `Build Modes` to provide detailed, clear explanations. This ensures the core design philosophy is well-understood and serves as a strong foundation for development and future maintenance.
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* **Refactored Scope:** The document is now cleanly focused on a library-only crate. All CLI-related requirements, user stories, and design sections have been removed, resulting in a more precise and actionable specification.
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* **Addendum and Checklist:** The specification concludes with the standard embedded `Appendix: Addendum`, which includes the auto-generated `Conformance Checklist`. This checklist serves as the definitive set of acceptance criteria for the project.
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---
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NEXT
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---
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This specification is now complete and ready for development. It is a robust contract that clearly defines the project's goals, requirements, architecture, and governance.
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The next step in the overall project lifecycle would be to create the `roadmap.md` file, which would use this specification as its primary input to define the implementation plan. However, as per my operational scope, my work on this specification is concluded.
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If you have any further refinements or questions about this document, I am ready to assist. Otherwise, this specification is ready to be handed off for implementation.

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