Switch of the banner when SpringBootTest runs an app with a parent

Closes gh-33079

Author: wilkinsona

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/SpringBootContextLoader.java

@@ -23,6 +23,7 @@
 
 import org.springframework.beans.BeanUtils;
 import org.springframework.boot.ApplicationContextFactory;
+import org.springframework.boot.Banner.Mode;
 import org.springframework.boot.DefaultPropertiesPropertySource;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.WebApplicationType;
@@ -129,6 +130,9 @@ else if (type == WebApplicationType.SERVLET) {
 			}
 			return ApplicationContextFactory.DEFAULT.create(type);
 		});
+		if (config.getParent() != null) {
+			application.setBannerMode(Mode.OFF);
+		}
 		application.setInitializers(initializers);
 		boolean customEnvironent = ReflectionUtils.findMethod(getClass(), "getEnvironment")
 				.getDeclaringClass() != SpringBootContextLoader.class;

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestContextHierarchyTests.java

@@ -17,14 +17,19 @@
 package org.springframework.boot.test.context;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.boot.test.context.SpringBootTestContextHierarchyTests.ChildConfiguration;
 import org.springframework.boot.test.context.SpringBootTestContextHierarchyTests.ParentConfiguration;
+import org.springframework.boot.test.system.CapturedOutput;
+import org.springframework.boot.test.system.OutputCaptureExtension;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.ContextHierarchy;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 /**
  * Tests for {@link SpringBootTest @SpringBootTest} and
  * {@link ContextHierarchy @ContextHierarchy}.
@@ -34,11 +39,12 @@
 @SpringBootTest
 @ContextHierarchy({ @ContextConfiguration(classes = ParentConfiguration.class),
 		@ContextConfiguration(classes = ChildConfiguration.class) })
+@ExtendWith(OutputCaptureExtension.class)
 class SpringBootTestContextHierarchyTests {
 
 	@Test
-	void contextLoads() {
-
+	void contextLoads(CapturedOutput capturedOutput) {
+		assertThat(capturedOutput).containsOnlyOnce(":: Spring Boot ::");
 	}
 
 	@Configuration(proxyBeanMethods = false)