1 files changed, 40 insertions, 0 deletions
diff --git a/spec/frontend/lib/utils/downloader_spec.js b/spec/frontend/lib/utils/downloader_spec.js
new file mode 100644
index 00000000000..c14cba3a62b
--- /dev/null
+++ b/spec/frontend/lib/utils/downloader_spec.js
@@ -0,0 +1,40 @@
+import downloader from '~/lib/utils/downloader';
+
+describe('Downloader', () => {
+  let a;
+
+  beforeEach(() => {
+    a = { click: jest.fn() };
+    jest.spyOn(document, 'createElement').mockImplementation(() => a);
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('when inline file content is provided', () => {
+    const fileData = 'inline content';
+    const fileName = 'test.csv';
+
+    it('uses the data urls to download the file', () => {
+      downloader({ fileName, fileData });
+      expect(document.createElement).toHaveBeenCalledWith('a');
+      expect(a.download).toBe(fileName);
+      expect(a.href).toBe(`data:text/plain;base64,${fileData}`);
+      expect(a.click).toHaveBeenCalledTimes(1);
+    });
+  });
+
+  describe('when an endpoint is provided', () => {
+    const url = 'https://gitlab.com/test.csv';
+    const fileName = 'test.csv';
+
+    it('uses the endpoint to download the file', () => {
+      downloader({ fileName, url });
+      expect(document.createElement).toHaveBeenCalledWith('a');
+      expect(a.download).toBe(fileName);
+      expect(a.href).toBe(url);
+      expect(a.click).toHaveBeenCalledTimes(1);
+    });
+  });
+});