Now after starting application PID file will be created

Fixes gh-550

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

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2010-2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.system;
+
+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
+ */
+public class ApplicationPidListenerTest {
+
+	private static final String[] NO_ARGS = {};
+
+	public static final String PID_FILE_NAME = "test.pid";
+
+	@Test
+	public void shouldCreatePidFile() {
+		//given
+		ApplicationPidListener sut = new ApplicationPidListener();
+		sut.setPidFileName(PID_FILE_NAME);
+
+		//when
+		sut.onApplicationEvent(new ApplicationStartedEvent(
+				new SpringApplication(), NO_ARGS));
+
+		//then
+		File pidFile = new File(PID_FILE_NAME);
+		assertTrue(pidFile.exists());
+		pidFile.delete();
+	}
+
+}