Laravel faker unknown format name

1. Check the available formatters in the Faker library. Some common ones include:
- `$faker->name()` - generates a random name
- `$faker->email()` - generates a random email address
- `$faker->sentence()` - generates a random sentence
- `$faker->paragraph()` - generates a random paragraph
- `$faker->randomNumber()` - generates a random number[1][3]

2. Make sure you are using the correct formatter name. For example, use `$faker->name()` instead of `$faker->firstName()` or `$faker->lastName()`[2].

3. If you have defined a custom formatter in your service provider, ensure that you have registered it properly with Faker[4].

4. When using factories in tests, make sure you are extending the correct base class (e.g. `TestCase` or `DatabaseMigrations`) and calling the parent `setUp()` method[5].

5. If the issue persists, try using feature tests instead of unit tests, as unit tests no longer use Faker by default in Laravel 8[5].

In summary, double check your formatter names, ensure you are using valid Faker formatters, and properly set up your test classes to resolve the "Unknown formatter" error when using Laravel Factories and Faker.