Add parent directory creation

Also tidied a few other things up (like not needing
SmartApplicationListener).

Fixes gh-550

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/system/ApplicationPidListenerTest.java

@@ -16,35 +16,56 @@
 
 package org.springframework.boot.actuate.system;
 
+import java.io.File;
+
+import org.junit.After;
 import org.junit.Test;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.context.event.ApplicationStartedEvent;
 
-import java.io.File;
-
 import static org.junit.Assert.assertTrue;
 
 /**
- * Created by jkubrynski@gmail.com / 2014-03-25
+ * @author Jakub Kubrynski
+ * @author Dave Syer
  */
 public class ApplicationPidListenerTest {
 
 	private static final String[] NO_ARGS = {};
 
-	public static final String PID_FILE_NAME = "test.pid";
+	@After
+	public void init() {
+		ApplicationPidListener.reset();
+	}
 
 	@Test
 	public void shouldCreatePidFile() {
-		//given
-		ApplicationPidListener sut = new ApplicationPidListener();
-		sut.setPidFileName(PID_FILE_NAME);
+		// given
+		String pidFileName = "test.pid";
+		ApplicationPidListener sut = new ApplicationPidListener(pidFileName);
 
-		//when
-		sut.onApplicationEvent(new ApplicationStartedEvent(
-				new SpringApplication(), NO_ARGS));
+		// when
+		sut.onApplicationEvent(new ApplicationStartedEvent(new SpringApplication(),
+				NO_ARGS));
 
-		//then
-		File pidFile = new File(PID_FILE_NAME);
+		// then
+		File pidFile = new File(pidFileName);
+		assertTrue(pidFile.exists());
+		pidFile.delete();
+	}
+
+	@Test
+	public void shouldCreatePidFileParentDirectory() {
+		// given
+		String pidFileName = "target/pid/test.pid";
+		ApplicationPidListener sut = new ApplicationPidListener(pidFileName);
+
+		// when
+		sut.onApplicationEvent(new ApplicationStartedEvent(new SpringApplication(),
+				NO_ARGS));
+
+		// then
+		File pidFile = new File(pidFileName);
 		assertTrue(pidFile.exists());
 		pidFile.delete();
 	}