OZG-4087 OZG-4144 implement service

alfa-xdomea/src/main/java/de/ozgcloud/xdomea/XDomeaService.java

 package de.ozgcloud.xdomea;
 
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+import org.springframework.stereotype.Service;
+
+import de.itvsh.kop.common.errorhandling.TechnicalException;
+
+@Service
 class XDomeaService {
+
+	public ByteArrayOutputStream createVorgangExport() {
+		ByteArrayOutputStream outputBytes = new ByteArrayOutputStream();
+		try (ZipOutputStream zipOutputStream = new ZipOutputStream(outputBytes)) {
+
+			putZipEntry("fake_file.txt", "data", zipOutputStream);
+
+		} catch (IOException ioe) {
+			throw new TechnicalException("Error creating zip file with Vorgang export", ioe);
+		}
+
+		return outputBytes;
+	}
+
+	private void putZipEntry(String fileName, String fileData, ZipOutputStream zipOutputStream) throws IOException {
+		ZipEntry entry = new ZipEntry(fileName);
+		zipOutputStream.putNextEntry(entry);
+		zipOutputStream.write(fileData.getBytes());
+		zipOutputStream.closeEntry();
+	}
+
 }

alfa-xdomea/src/test/java/de/ozgcloud/xdomea/XDomeaServiceTest.java

 package de.ozgcloud.xdomea;
 
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
 class XDomeaServiceTest {
 
+	private XDomeaService service = new XDomeaService();
+
+	@Nested
+	class TestCreateVorgangExport {
+
+		@Test
+		void shouldCreate() {
+			var zipBytesStream = service.createVorgangExport();
+
+			assertThat(zipBytesStream).isNotNull();
+			assertThat(zipBytesStream.toByteArray()).hasSizeGreaterThan(100);
+		}
+
+	}
+
 }
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