anchor.diff:  * `GenericPropertiesContextLoader`: loads a standard `ApplicationContext` from Java
   Properties files.
   
  +[[testcontext-bootstrapping]]
  +==== Bootstrapping the TestContext framework
  +
  +The default configuration for the internals of the Spring TestContext Framework is
  +sufficient for all common use cases. However, there are times when a development team or
  +third party framework would like to change the default `ContextLoader`, implement a
  +custom `TestContext` or `ContextCache`, augment the default sets of
  +`ContextCustomizerFactory` and `TestExecutionListener` implementations, etc. For such low
  +level control over how the TestContext framework operates, Spring provides a
  +bootstrapping strategy.
  +
  +`TestContextBootstrapper` defines the SPI for _bootstrapping_ the TestContext framework.
  +A `TestContextBootstrapper` is used by the `TestContextManager` to load the
  +`TestExecutionListener` implementations for the current test and to build the
  +`TestContext` that it manages. A custom bootstrapping strategy can be configured for a
  +test class (or test class hierarchy) via `@BootstrapWith`, either directly or as a
  +meta-annotation. If a bootstrapper is not explicitly configured via `@BootstrapWith`,
  +either the `DefaultTestContextBootstrapper` or the `WebTestContextBootstrapper` will be
  +used, depending on the presence of `@WebAppConfiguration`.
  +
  +Since the `TestContextBootstrapper` SPI is likely to change in the future in order to
  +accommodate new requirements, implementers are strongly encouraged not to implement this
  +interface directly but rather to extend `AbstractTestContextBootstrapper` or one of its
  +concrete subclasses instead.
   
   [[testcontext-tel-config]]
   ==== TestExecutionListener configuration
  
positive.code: Each of the following may be used as meta-annotations in conjunction with the
  <<testcontext-framework,TestContext framework>>.
  
  * `@ContextConfiguration`
  * `@ContextHierarchy`
  * `@ActiveProfiles`
  
negative.code: framework. Refer to the corresponding javadocs for further information, including
  default attribute values, attribute aliases, and so on.
  
  ===== @BootstrapWith
  `@BootstrapWith` is a class-level annotation that is used to configure how the _Spring
  TestContext Framework_ is bootstrapped. Specifically, `@BootstrapWith` is used to specify
  a custom `TestContextBootstrapper`. Consult the <<testcontext-bootstrapping,Bootstrapping
  the TestContext framework>> section for further details.
  
  ===== @ContextConfiguration
  `@ContextConfiguration` defines class-level metadata that is used to determine how to
  load and configure an `ApplicationContext` for integration tests. Specifically,
  