Add tests

packages/kernel/src/react-helpers/download-button.spec.ts

@@ -0,0 +1,19 @@
+import { describe, it, expect } from "vitest";
+import { getFileNameFromContentDispositionHeader } from "./download-button";
+
+describe("getFileNameFromContentDispositionHeader", () => {
+  [
+    {
+      header: `attachment; filename="StreamlitApp_2022-08-12_14-44-14.bin"`,
+      expected: "StreamlitApp_2022-08-12_14-44-14.bin",
+    },
+    {
+      header: "attachment; filename*=utf-8''%E3%83%86%E3%82%B9%E3%83%88.png",
+      expected: "テスト.png",
+    },
+  ].forEach(({ header, expected }) => {
+    it(`extracts filename ("${expected}") from the given ContentDisposition header value ("${header}")`, () => {
+      expect(getFileNameFromContentDispositionHeader(header)).toEqual(expected);
+    });
+  });
+});

packages/kernel/src/react-helpers/download-button.ts

@@ -1,7 +1,7 @@
 import type { StliteKernel } from "../kernel";
 import { parse } from "@tinyhttp/content-disposition";
 
-function getFileNameFromContentDispositionHeader(
+export function getFileNameFromContentDispositionHeader(
   contentDisposition: string,
 ): string | undefined {
   const parsed = parse(contentDisposition);