解决java.lang.IllegalStateException: Unable to find a @SpringBootConfiguration, you need to use @ContextConfiguration or @SpringBootTest(classes=...) with your test

The `java.lang.IllegalStateException: Unable to find a @SpringBootConfiguration` error occurs when you try to run a Spring Boot test without specifying the configuration class.

To fix this error, you need to specify the configuration class for your test using one of the following options:

1. Use `@SpringBootTest` annotation with the `classes` attribute to specify the configuration class:

@SpringBootTest(classes = MyConfiguration.class)
public class MyTest {
    // ...
}

2. Use `@ContextConfiguration` annotation to specify the configuration class:

@ContextConfiguration(classes = MyConfiguration.class)
public class MyTest {
    // ...
}

Make sure that `MyConfiguration` is the class that contains your Spring Boot configuration.

With either option, the configuration class should contain the `@SpringBootApplication` annotation or its variants (e.g. `@EnableAutoConfiguration`, `@ComponentScan`, etc.) that define the Spring Boot application context.