BAEL-3299 - Testing a Spring Batch Job (#7982)

* BAEL-3299: First version. Broken tests

* BAEL-3299: Fix tests

* BAEL-3299: Include gitignore for output files

* BAEL-3299: Example of writer unit test

* BAEL-3299: Cleaned up and included more tests

* BAEL-3299: Updated to use JobParameters

* BAEL-3299: Fixed broken startup and included cleanup for tests

* BAEL-3299: Fine tuned version. Fixed formatting.

* BAEL-3299: Cleaned up redundant stuff

* BAEL-3299: Fixed formatting

* BAEL-3299: Moved source code in spring-batch module

* BAEL-3299: Fixed broken tests

spring-batch/src/main/java/org/baeldung/batchtesting/SpringBatchApplication.java

@@ -0,0 +1,43 @@
+package org.baeldung.batchtesting;
+
+import org.springframework.batch.core.Job;
+import org.springframework.batch.core.JobParametersBuilder;
+import org.springframework.batch.core.launch.JobLauncher;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
+
+@SpringBootApplication
+@PropertySource("classpath:batchtesting/application.properties")
+public class SpringBatchApplication implements CommandLineRunner {
+
+    @Autowired
+    private JobLauncher jobLauncher;
+
+    @Autowired
+    @Qualifier("transformBooksRecords")
+    private Job transformBooksRecordsJob;
+
+    @Value("${file.input}")
+    private String input;
+
+    @Value("${file.output}")
+    private String output;
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringBatchApplication.class, args);
+    }
+
+    @Override
+    public void run(String... args) throws Exception {
+        JobParametersBuilder paramsBuilder = new JobParametersBuilder();
+        paramsBuilder.addString("file.input", input);
+        paramsBuilder.addString("file.output", output);
+        jobLauncher.run(transformBooksRecordsJob, paramsBuilder.toJobParameters());
+    }
+
+}