RESOLVED - issue BATCH-473: Create Tasklet sample job.

http://jira.springframework.org/browse/BATCH-473

added tasklet job that deletes files in given directory (description clarifies this would typically be a preliminary step in multi-step job)

spring-batch-samples/src/test/java/org/springframework/batch/sample/TaskletJobFunctionalTests.java

@@ -0,0 +1,50 @@
+package org.springframework.batch.sample;
+
+import java.io.File;
+
+import org.springframework.core.io.Resource;
+import org.springframework.util.Assert;
+
+/**
+ * Deletes files in the given directory.
+ * 
+ * @author Robert Kasanicky
+ */
+public class TaskletJobFunctionalTests extends AbstractValidatingBatchLauncherTests {
+
+	private Resource directory;
+	
+	/**
+	 * Setter for auto-injection.
+	 */ 
+	public void setDirectory(Resource directory) {
+		this.directory = directory;
+	}
+
+	/**
+	 * Create the directory and some files in it.
+	 */
+	protected void onSetUp() throws Exception {
+		File dir = directory.getFile();
+		dir.mkdirs();
+		new File(dir, "file1").createNewFile();
+		new File(dir, "file2").createNewFile();
+	}
+
+	/**
+	 * We have directory with some files in it.
+	 */
+	protected void validatePreConditions() throws Exception {
+		Assert.state(directory.getFile().isDirectory());
+		Assert.state(directory.getFile().listFiles().length > 0);
+	}
+
+	/**
+	 * Directory still exists but contains no files.
+	 */
+	protected void validatePostConditions() throws Exception {
+		Assert.state(directory.getFile().isDirectory());
+		Assert.state(directory.getFile().listFiles().length == 0);
+	}
+
+}