Fix some broken tests in empty new environments

spring-boot/src/test/java/org/springframework/boot/logging/LoggingApplicationListenerTests.java

@@ -110,8 +110,7 @@ public class LoggingApplicationListenerTests {
 		String output = this.outputCapture.toString().trim();
 		assertTrue("Wrong output:\n" + output, output.contains("Hello world"));
 		assertFalse("Wrong output:\n" + output, output.contains("???"));
-		assertTrue("Wrong output:\n" + output,
-				output.startsWith(tmpDir() + "/spring.log"));
+		assertTrue("Wrong output:\n" + output, output.startsWith(tmpDir() + "/tmp.log"));
 	}
 
 	@Test
@@ -157,7 +156,7 @@ public class LoggingApplicationListenerTests {
 		Log logger = LogFactory.getLog(LoggingApplicationListenerTests.class);
 		logger.info("Hello world");
 		String output = this.outputCapture.toString().trim();
-		assertTrue("Wrong output:\n" + output, output.startsWith("target/foo/spring.log"));
+		assertTrue("Wrong output:\n" + output, output.startsWith("target/foo/tmp.log"));
 	}
 
 	@Test

spring-boot/src/test/resources/logback-nondefault.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <configuration>
-	<property name="LOG_FILE" value="${LOG_FILE:-${LOG_PATH:-/tmp/}spring.log}"/>
+	<property name="LOG_FILE" value="${LOG_FILE:-${LOG_PATH:-${java.io.tmpdir:-/tmp}/}tmp.log}"/>
 	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
 		<encoder>
 			<pattern>${LOG_FILE} [%t] ${PID:-????} %c{1}: %m%n</pattern>