public HdfsMongoDbJob fileName(String fileName) {
		Assert.hasText(fileName, "FileName should not be empty nor null");
		this.fileName = fileName;
		return this;
	}
Sets the fileName of the file to be read
@param fileName the name of the file
@return The current instance of the HdfsMongoDbJob
spring-xd-test-fixtures/src/main/java/org/springframework/xd/test/fixtures/HdfsMongoDbJob.java