Add tests for LabCsvHelper

This MR adds tests for LabCsvHelper. Also fix a flaky test in LabServiceTest which failed if run after 7PM

src/main/java/nl/tudelft/ewi/queue/csv/LabCsvHelper.java

@@ -21,8 +21,9 @@ import java.util.List;
 import java.util.stream.Collectors;
 
 import lombok.AllArgsConstructor;
-import lombok.Data;
+import lombok.Getter;
 import lombok.NoArgsConstructor;
+import lombok.Setter;
 import nl.tudelft.ewi.queue.model.Group;
 import nl.tudelft.ewi.queue.model.Request;
 import nl.tudelft.ewi.queue.model.User;
@@ -57,7 +58,8 @@ public class LabCsvHelper {
 	 * The representation currently only contains fields representing the request as strings. The
 	 * JsonPropertyOrder annotation provides an order to the CSV columns created from this.
 	 */
-	@Data
+	@Getter
+	@Setter
 	@NoArgsConstructor
 	@AllArgsConstructor
 	@JsonPropertyOrder({ NET_ID_NAME, CREATED_AT_NAME, HANDLED_AT_NAME, SLOT_STARTS_AT_NAME,