Sometimes tests need to make the same assertions over many different types of data. Using #[DataProvider] can help reduce the amount of test duplication when you encounter this scenario.
When a test needs to make the same assertion across a variety of data a data provider can reduce the amount of duplication necessary to write the appropriate tests. A data provider is a public method on the TestCase that returns an array of arrays with the appropriate arguments for the test. The test needing to use the data provider should be annotated with the #[DataProvider] Attribute and define parameters on its method signature.