diff --git a/modules/invoiceOut/back/methods/invoiceOut/specs/download.spec.js b/modules/invoiceOut/back/methods/invoiceOut/specs/download.spec.js
new file mode 100644
index 000000000..09289896f
--- /dev/null
+++ b/modules/invoiceOut/back/methods/invoiceOut/specs/download.spec.js
@@ -0,0 +1,10 @@
+const app = require('vn-loopback/server/server');
+
+describe('InvoiceOut download()', () => {
+    it('should return the downloaded fine name', async() => {
+        let result = await app.models.InvoiceOut.download(1);
+
+        expect(result[1]).toEqual('text/plain');
+        expect(result[2]).toEqual('filename="README.md"');
+    });
+});