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packages/placeholder-pdf-lib/src/pdflibAddPlaceholder.test.js

@@ -157,5 +157,27 @@ describe(pdflibAddPlaceholder, () => {
         expect(newAcroFormRef.tag).toBe(existingAcroFormTag);
     });
 
+    it('does not overwrite page annotations when there already were some', async () => {
+        const input = readTestResource('signed-once.pdf');
+        expect(input.indexOf('/ByteRange')).not.toBe(-1);
+        const pdfDoc = await PDFDocument.load(input);
+        const existingAnnotations = pdfDoc
+            .getPage(0).node
+            .lookup(PDFName.of('Annots'), PDFArray)
+            .asArray().map((v) => v.toString());
+
+        pdflibAddPlaceholder({
+            pdfDoc,
+            ...defaults,
+        });
+
+        const newAnnotations = pdfDoc
+            .getPage(0).node
+            .lookup(PDFName.of('Annots'), PDFArray)
+            .asArray().map((v) => v.toString());
+        expect(newAnnotations).toEqual(expect.arrayContaining(existingAnnotations));
+        expect(newAnnotations).toHaveLength(existingAnnotations.length + 1);
+    });
+
     it.todo('adds placeholder to PDFDocument document when AcroForm is already there');
 });