Polish support for @⁠Import on interfaces

- Update @⁠Import Javadoc

- Move tests from ImportSelectorTests to ImportTests

See gh-34820

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -550,12 +550,13 @@ class ConfigurationClassParser {
 	 * <p>For example, it is common for a {@code @Configuration} class to declare direct
 	 * {@code @Import}s in addition to meta-imports originating from an {@code @Enable}
 	 * annotation.
-	 * <p>As of Spring Framework 7.0, {@code @Import} annotations declared on interfaces implemented by
-	 * the configuration class are also considered. This allows imports to be triggered
-	 * indirectly via marker interfaces or shared base interfaces.
+	 * <p>As of Spring Framework 7.0, {@code @Import} annotations declared on interfaces
+	 * implemented by the configuration class are also considered. This allows imports to
+	 * be triggered indirectly via marker interfaces or shared base interfaces.
 	 * @param sourceClass the class to search
 	 * @param imports the imports collected so far
-	 * @param visited used to track visited classes to prevent infinite recursion
+	 * @param visited used to track visited classes and interfaces to prevent infinite
+	 * recursion
 	 * @throws IOException if there is any problem reading metadata from the named class
 	 */
 	private void collectImports(SourceClass sourceClass, Set<SourceClass> imports, Set<SourceClass> visited)

spring-context/src/main/java/org/springframework/context/annotation/Import.java

@@ -47,6 +47,12 @@ import org.springframework.beans.factory.BeanRegistrar;
  * directly declared imports to override beans registered via {@code @Import}
  * meta-annotations.
  *
+ * <p>As of Spring Framework 7.0, {@code @Import} annotations declared on interfaces
+ * implemented by {@code @Configuration} classes are also supported. Locally declared
+ * {@code @Import} annotations are processed after {@code @Import} annotations on
+ * interfaces, which allows local imports to override beans registered via
+ * {@code @Import} annotations inherited from interfaces.
+ *
  * <p>If XML or other non-{@code @Configuration} bean definition resources need to be
  * imported, use the {@link ImportResource @ImportResource} annotation instead.
  *