Minimize and centralize assumptions about build output

Closes gh-15471

spring-boot-tests/spring-boot-integration-tests/spring-boot-devtools-tests/pom.xml

@@ -26,6 +26,11 @@
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-test-support</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>net.bytebuddy</groupId>
 			<artifactId>byte-buddy</artifactId>