test: fix update patch when removing old revisions

Signed-off-by: yamashush <38120991+yamashush@users.noreply.github.com>
Signed-off-by: Philip Molares <philip.molares@udo.edu>

.reuse/dep5

@@ -122,3 +122,7 @@ License: CC0-1.0
 Files: frontend/**/__snapshots__/*.snap
 Copyright: 2022 The HedgeDoc developers (see AUTHORS file)
 License: AGPL-3.0-only
+
+Files: backend/**/__snapshots__/*.snap
+Copyright: 2024 The HedgeDoc developers (see AUTHORS file)
+License: AGPL-3.0-only

backend/src/revisions/__snapshots__/revisions.service.spec.ts.snap

@@ -0,0 +1,16 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`RevisionsService purgeRevisions purges the revision history 1`] = `
+"Index: test-note
+===================================================================
+--- test-note
++++ test-note
+@@ -0,0 +1,6 @@
++---
++title: new title
++description: new description
++tags: [ "tag1" ]
++---
++new content
+"
+`;

backend/src/revisions/revisions.service.spec.ts

@@ -34,6 +34,7 @@ import { EditService } from './edit.service';
 import { Revision } from './revision.entity';
 import { RevisionsService } from './revisions.service';
 
+
 describe('RevisionsService', () => {
   let service: RevisionsService;
   let revisionRepo: Repository<Revision>;
@@ -121,7 +122,7 @@ describe('RevisionsService', () => {
     let note: Note;
 
     beforeEach(() => {
-      note = Mock.of<Note>({});
+      note = Mock.of<Note>({ publicId: 'test-note', id: 1 });
       revisions = [];
 
       jest
@@ -141,23 +142,36 @@ describe('RevisionsService', () => {
     });
 
     it('purges the revision history', async () => {
-      const revision1 = Mock.of<Revision>({ id: 1 });
-      const revision2 = Mock.of<Revision>({ id: 2 });
-      const revision3 = Mock.of<Revision>({ id: 3 });
+      const revision1 = Mock.of<Revision>({
+        id: 1,
+        note: Promise.resolve(note),
+      });
+      const revision2 = Mock.of<Revision>({
+        id: 2,
+        note: Promise.resolve(note),
+      });
+      const revision3 = Mock.of<Revision>({
+        id: 3,
+        note: Promise.resolve(note),
+        content:
+          '---\ntitle: new title\ndescription: new description\ntags: [ "tag1" ]\n---\nnew content\n',
+      });
       revisions = [revision1, revision2, revision3];
       note.revisions = Promise.resolve(revisions);
 
       jest.spyOn(revisionRepo, 'find').mockResolvedValueOnce(revisions);
       jest.spyOn(service, 'getLatestRevision').mockResolvedValueOnce(revision3);
 
+      jest.spyOn(revisionRepo, 'save').mockResolvedValue(Mock.of<Revision>());
+
       // expected to return all the purged revisions
       expect(await service.purgeRevisions(note)).toStrictEqual([
         revision1,
         revision2,
       ]);
 
-      // expected to have only the latest revision
       expect(revisions).toStrictEqual([revision3]);
+      expect(revision3.patch).toMatchSnapshot();
     });
     it('has no effect on revision history when a single revision is present', async () => {
       const revision1 = Mock.of<Revision>({ id: 1 });

backend/src/revisions/revisions.service.ts

@@ -59,6 +59,17 @@ export class RevisionsService {
     const oldRevisions = revisions.filter(
       (item) => item.id !== latestRevision.id,
     );
+
+    // update content diff
+    if (oldRevisions.length > 0) {
+      latestRevision.patch = createPatch(
+        note.publicId,
+        '',
+        latestRevision.content,
+      );
+      await this.revisionRepository.save(latestRevision);
+    }
+
     // delete the old revisions
     return await this.revisionRepository.remove(oldRevisions);
   }