diff --git a/src/test/java/de/rwu/easydrop/service/writer/OfferWriterTest.java b/src/test/java/de/rwu/easydrop/service/writer/OfferWriterTest.java
new file mode 100644
index 0000000..2d966bd
--- /dev/null
+++ b/src/test/java/de/rwu/easydrop/service/writer/OfferWriterTest.java
@@ -0,0 +1,62 @@
+package de.rwu.easydrop.service.writer;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import javax.sound.sampled.AudioFileFormat.Type;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+
+import de.rwu.easydrop.api.dto.OfferDTO;
+import de.rwu.easydrop.api.dto.ProductDTO;
+import de.rwu.easydrop.data.connector.OfferPersistenceInterface;
+import de.rwu.easydrop.model.Offer;
+import de.rwu.easydrop.model.Product;
+import de.rwu.easydrop.model.Webshop;
+
+public class OfferWriterTest {
+    
+    @Mock
+    private OfferDTO offerDTO;
+    @Mock
+    private OfferPersistenceInterface persistence;
+
+    private OfferWriter offerWriter;
+
+    @BeforeEach
+    public void setup() {
+        MockitoAnnotations.openMocks(this);
+        offerWriter = new OfferWriter(persistence);
+    }
+
+
+
+
+    @Test
+    void writeOfferToPersistence_InvalidProduct_ThrowsException() {
+        //Arrange
+        Offer offer = new Offer();
+        offer.setOfferId("");
+        offer.setLastUpdate("");
+
+        //Act and Assert
+        assertThrows(Exception.class, () -> offerWriter.writeOfferToPersistence(offer));
+    }
+
+
+
+
+
+
+
+
+
+
+}