1 files changed, 27 insertions, 0 deletions
diff --git a/webAO/__tests__/downloadFile.test.ts b/webAO/__tests__/downloadFile.test.ts
new file mode 100644
index 0000000..738d6f3
--- /dev/null
+++ b/webAO/__tests__/downloadFile.test.ts
@@ -0,0 +1,27 @@
+import downloadFile from "../services/downloadFile";
+jest.useFakeTimers().setSystemTime(new Date("2020-01-01").getTime());
+
+global.URL.createObjectURL = jest.fn();
+(window as any).global.Blob = function (content, options) {
+  return { content, options };
+};
+
+describe("downloadFile", () => {
+  it("Creates an <a> tag", () => {
+    const createElementSpy = jest.spyOn(document, "createElement");
+    downloadFile("hi", "filename");
+    expect(createElementSpy).toBeCalled();
+  });
+  it("Creates the blob with the correct data", () => {
+    const data = "writingtestsishard";
+    global.URL.createObjectURL = jest.fn(() => data);
+    downloadFile(data, "filename");
+    const expected = {
+      content: [data],
+      options: {
+        type: "text",
+      },
+    };
+    expect(global.URL.createObjectURL).toBeCalledWith(expected);
+  });
+});