Move Log4J2 test inner types

Signed-off-by: hojooo <[email protected]>

Author: hojooo

core/spring-boot/src/test/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystemTests.java

@@ -67,6 +67,7 @@
 import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.boot.logging.LoggingSystemProperties;
 import org.springframework.boot.logging.LoggingSystemProperty;
+import org.springframework.boot.logging.log4j2.Log4j2RollingPolicySystemProperty;
 import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
 import org.springframework.boot.testsupport.classpath.resources.WithResource;
 import org.springframework.boot.testsupport.logging.ConfigureClasspathToPreferLog4j2;
@@ -123,6 +124,7 @@ void cleanUp() {
 		this.loggingSystem.getConfiguration().stop();
 		this.loggingSystem.cleanUp();
 		PluginRegistry.getInstance().clear();
+		clearRollingPolicySystemProperties();
 	}
 
 	@Test
@@ -137,6 +139,12 @@ void noFile(CapturedOutput output) {
 		assertThat(configuration.getConfigurationSource().getFile()).isNotNull();
 	}
 
+	private void clearRollingPolicySystemProperties() {
+		for (Log4j2RollingPolicySystemProperty property : Log4j2RollingPolicySystemProperty.values()) {
+			System.clearProperty(property.getEnvironmentVariableName());
+		}
+	}
+
 	@Test
 	void withFile(CapturedOutput output) {
 		this.loggingSystem.beforeInitialize();