docs: add plugin dependency testing guidance#6737
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| Fastify plugins can also provide dependencies to the parts of an application | ||
| that need them. A common pattern is to register a plugin that decorates the | ||
| Fastify instance with a repository, API client, or service, then register the | ||
| routes that use that decorator below the dependency plugin. |
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Incredibly verbose and doesn't read well at all.
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Closes #5190\n\nThis adds a focused Testing guide section for using Fastify plugins and decorators as dependency injection points. It shows how to register a fake dependency in the parent context before registering the route plugin under test, and links back to getDecorator and fastify-plugin for dependency validation and encapsulation behavior.