[Feature] Test Suite

[dannypurcell]

Test coverage for the generator itself — not the generated projects.

Unit tests

• Generated project contains expected files for each config combination
• DotnetNamespace() converts project names correctly
• BackendDir() returns correct dir for each backend
• Template rendering produces valid content (no unresolved {{ in output)
• ETL sub-project omitted when DataProcessing: false
• CLI sub-project omitted when CLIClient: none

Functional tests

• Generate a C#/.NET project → docker compose up → all health endpoints respond
• Generate a Python/FastAPI project → same
• Generate a Go/Echo project → same
• Each test runs in a temp dir, tears down containers after

Sub-tasks

• Unit tests for config helpers
• Unit tests for generator file output
• Functional test harness (generate + compose up + curl)
• Functional test: C#/.NET stack
• Functional test: Python/FastAPI stack (blocked on Python templates)
• Functional test: Go/Echo stack (blocked on Go templates)
• Wire functional tests into CI