Expose RepositoryFragments as infrastructure bean.

We now expose RepositoryFragments as a bean to be referenced when creating the actual repository.

Original Pull Request: #2596

src/test/java/org/springframework/data/repository/config/RepositoryBeanDefinitionRegistrarSupportUnitTests.java

@@ -78,6 +78,16 @@ class RepositoryBeanDefinitionRegistrarSupportUnitTests {
 		assertNoBeanDefinitionRegisteredFor("profileRepository");
 	}
 
+
+	@Test // GH-2584
+	void shouldExposeFragmentsAsBean() {
+
+		AnnotationMetadata metadata = new StandardAnnotationMetadata(SampleConfiguration.class, true);
+
+		registrar.registerBeanDefinitions(metadata, registry);
+		verify(registry, atLeast(1)).registerBeanDefinition(eq("commons.MyRepository.fragments#0"), any(BeanDefinition.class));
+	}
+
 	@Test // DATACMNS-1754
 	void registersBeanDefinitionForNestedRepositories() {