private Set<ContextCustomizer> getContextCustomizers(Class<?> testClass,
		List<ContextConfigurationAttributes> configAttributes) {

	List<ContextCustomizerFactory> factories = getContextCustomizerFactories();
	Set<ContextCustomizer> customizers = new LinkedHashSet<>(factories.size());
	for (ContextCustomizerFactory factory : factories) {
		ContextCustomizer customizer = factory.createContextCustomizer(testClass, configAttributes);
		if (customizer != null) {
			customizers.add(customizer);
		}
	}
	return customizers;
}
 

@Override
protected List<ContextCustomizerFactory> getContextCustomizerFactories() {
	return singletonList(
		(ContextCustomizerFactory) (testClass, configAttributes) ->
			(ContextCustomizer) (context, mergedConfig) -> context.getBeanFactory().registerSingleton("foo", "foo")
	);
}
 

private Set<ContextCustomizer> getContextCustomizers(Class<?> testClass,
		List<ContextConfigurationAttributes> configAttributes) {

	List<ContextCustomizerFactory> factories = getContextCustomizerFactories();
	Set<ContextCustomizer> customizers = new LinkedHashSet<>(factories.size());
	for (ContextCustomizerFactory factory : factories) {
		ContextCustomizer customizer = factory.createContextCustomizer(testClass, configAttributes);
		if (customizer != null) {
			customizers.add(customizer);
		}
	}
	return customizers;
}
 

@Override
protected List<ContextCustomizerFactory> getContextCustomizerFactories() {
	return singletonList(
		(ContextCustomizerFactory) (testClass, configAttributes) ->
			(ContextCustomizer) (context, mergedConfig) -> context.getBeanFactory().registerSingleton("foo", "foo")
	);
}
 

@Override
protected List<ContextCustomizerFactory> getContextCustomizerFactories() {
	return singletonList(
		(ContextCustomizerFactory) (testClass, configAttributes) -> (ContextCustomizer) (context,
				mergedConfig) -> context.getBeanFactory().registerSingleton("foo", "foo"));
}
 

@Override
protected List<ContextCustomizerFactory> getContextCustomizerFactories() {
	return singletonList(
		(ContextCustomizerFactory) (testClass, configAttributes) -> (ContextCustomizer) (context,
				mergedConfig) -> context.getBeanFactory().registerSingleton("foo", "foo"));
}
 

/**
 * Get the {@link ContextCustomizerFactory} instances for this bootstrapper.
 * <p>The default implementation uses the {@link SpringFactoriesLoader} mechanism
 * for loading factories configured in all {@code META-INF/spring.factories}
 * files on the classpath.
 * @since 4.3
 * @see SpringFactoriesLoader#loadFactories
 */
protected List<ContextCustomizerFactory> getContextCustomizerFactories() {
	return SpringFactoriesLoader.loadFactories(ContextCustomizerFactory.class, getClass().getClassLoader());
}
 

/**
 * Get the {@link ContextCustomizerFactory} instances for this bootstrapper.
 * <p>The default implementation uses the {@link SpringFactoriesLoader} mechanism
 * for loading factories configured in all {@code META-INF/spring.factories}
 * files on the classpath.
 * @since 4.3
 * @see SpringFactoriesLoader#loadFactories
 */
protected List<ContextCustomizerFactory> getContextCustomizerFactories() {
	return SpringFactoriesLoader.loadFactories(ContextCustomizerFactory.class, getClass().getClassLoader());
}