From b1a5ef2f995cd0a34c424105ca93e91c9ef8b979 Mon Sep 17 00:00:00 2001
From: Marcel <marcel@familienarchiv>
Date: Thu, 23 Apr 2026 21:45:33 +0200
Subject: [PATCH] test(document): getThumbnailUrl returns null when
 thumbnailKey is null
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First TDD step for centralising the thumbnail URL convention on the
Document entity (#309). Adds a stub getter returning null and a test
that locks the "no key → no URL" branch.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
---
 .../familienarchiv/model/Document.java        |  4 ++++
 .../familienarchiv/model/DocumentTest.java    | 23 +++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 backend/src/test/java/org/raddatz/familienarchiv/model/DocumentTest.java

diff --git a/backend/src/main/java/org/raddatz/familienarchiv/model/Document.java b/backend/src/main/java/org/raddatz/familienarchiv/model/Document.java
index d2cea5da..5fb3c3b2 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/model/Document.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/model/Document.java
@@ -124,4 +124,8 @@ public class Document {
     @Enumerated(EnumType.STRING)
     @Builder.Default
     private Set<TrainingLabel> trainingLabels = new HashSet<>();
+
+    public String getThumbnailUrl() {
+        return null;
+    }
 }
diff --git a/backend/src/test/java/org/raddatz/familienarchiv/model/DocumentTest.java b/backend/src/test/java/org/raddatz/familienarchiv/model/DocumentTest.java
new file mode 100644
index 00000000..c6e82fb3
--- /dev/null
+++ b/backend/src/test/java/org/raddatz/familienarchiv/model/DocumentTest.java
@@ -0,0 +1,23 @@
+package org.raddatz.familienarchiv.model;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class DocumentTest {
+
+    @Test
+    void getThumbnailUrl_returnsNull_whenThumbnailKeyNull() {
+        Document doc = Document.builder()
+                .id(UUID.randomUUID())
+                .title("Brief")
+                .originalFilename("brief.pdf")
+                .status(DocumentStatus.UPLOADED)
+                .thumbnailKey(null)
+                .build();
+
+        assertThat(doc.getThumbnailUrl()).isNull();
+    }
+}