Polish "Add MemoryInfo to ProcessInfo"

See gh-41262

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/info/ProcessInfo.java

@@ -84,6 +84,11 @@ public class ProcessInfo {
 		return this.owner;
 	}
 
+	/**
+	 * Memory information.
+	 *
+	 * @since 3.4.0
+	 */
 	public static class MemoryInfo {
 
 		private static final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/info/ProcessInfoTests.java

@@ -37,7 +37,11 @@ class ProcessInfoTests {
 		assertThat(processInfo.getPid()).isEqualTo(ProcessHandle.current().pid());
 		assertThat(processInfo.getParentPid())
 			.isEqualTo(ProcessHandle.current().parent().map(ProcessHandle::pid).orElse(null));
+	}
 
+	@Test
+	void memoryInfoIsAvailable() {
+		ProcessInfo processInfo = new ProcessInfo();
 		MemoryUsageInfo heapUsageInfo = processInfo.getMemory().getHeap();
 		MemoryUsageInfo nonHeapUsageInfo = processInfo.getMemory().getNonHeap();
 		assertThat(heapUsageInfo.getInit()).isPositive().isLessThanOrEqualTo(heapUsageInfo.getMax());