docs: add addComponent and testing to modules and update addImports

docs/content/2.guide/4.going-further/3.modules.md

@@ -174,6 +174,18 @@ By moving your modules to [nuxt-community](https://github.com/nuxt-community), t
 
 If you have an already published and working module and want to transfer it to nuxt-community, open an issue in [nuxt/modules](https://github.com/nuxt/modules/issues/new).
 
+## Testing
+
+### `@nuxt/test-utils`
+
+Nuxt 3 has a testing library for testing Nuxt apps and modules. You can check out [testing modules](/getting-started/testing#testing-modules) for more information and examples.
+
+### Testing Externally
+
+If you wish to test your module outside of the module playground before publishing to npm, you can use [`npm pack`](https://docs.npmjs.com/cli/v7/commands/npm-pack) command, or your package manager equivalent, to create a tarball from your module. Then in your test project, you can add your module to `package.json` packages as: `"nuxt-module-name": "file:/path/to/tarball.tgz"`.
+
+After that, you should be able to reference `nuxt-module-name` like in any regular project.
+
 ## Examples
 
 ### Provide Nuxt Plugins
@@ -210,6 +222,26 @@ export default defineNuxtModule({
 })
 ```
 
+### Adding Vue Components
+
+If your module should provide Vue components, you can use the `addComponent` utility to add them as auto-imports for Nuxt to resolve.
+
+```ts
+import { defineNuxtModule, addComponent } from '@nuxt/kit'
+
+export default defineNuxtModule({
+  setup(options, nuxt) {
+    addComponent({
+      name: 'MyComponent', // name of the component to be used in vue templates
+      export: 'MyAwesomeComponent', // (optional) if the component is a named (rather than default) export
+      // filePath should be package name or resolved path
+      // if the component is created locally, preferably in `runtime` dir
+      filePath: '@vue/awesome-components' // resolve(runtimeDir, 'components', 'MyComponent.vue')
+    })
+  }
+})
+```
+
 ### Clean Up Module
 
 If your module opens, handles or starts a watcher, you should close it when the Nuxt lifecycle is done. For this, use the `close` hook:

docs/content/3.api/4.advanced/2.kit.md

@@ -34,8 +34,8 @@
 
 [source code](https://github.com/nuxt/framework/blob/main/packages/kit/src/imports.ts)
 
-- `addAutoImport(imports)`
-- `addAutoImportDir(autoImportDirs)`
+- `addImports(imports)`
+- `addImportsDir(autoImportDirs)`
 
 ### Components