formats.exposed/test/index/routeFile.test.ts

import { assertEquals } from "assert";
import routeFile from "../../public/index/routeFile.js";

Deno.test("routes files correctly", async () => {
  const PNG_SIGNATURE = new Uint8Array([
    0x89,
    0x50,
    0x4E,
    0x47,
    0x0D,
    0x0A,
    0x1A,
    0x0A,
  ]);
  const GIF87_SIGNATURE = new Uint8Array([0x47, 0x49, 0x46, 0x38, 0x37, 0x61]);
  const GIF89_SIGNATURE = new Uint8Array([0x47, 0x49, 0x46, 0x38, 0x39, 0x61]);

  const testCases = new Map<File, null | string>([
    // No matching type
    [new File([], "foo"), null],
    [new File([], "foo.txt"), null],
    [new File([], "foo.txt", { type: "text/plain" }), null],
    // GIF
    [new File([], "foo", { type: "image/gif" }), "gif"],
    [new File([], "foo.gif"), "gif"],
    [new File([], "foo.gif", { type: "text/plain" }), "gif"],
    [new File([GIF87_SIGNATURE], "foo"), "gif"],
    [new File([GIF89_SIGNATURE], "foo"), "gif"],
    // PNG
    [new File([], "foo", { type: "image/png" }), "png"],
    [new File([], "foo.png"), "png"],
    [new File([], "foo.png", { type: "text/plain" }), "png"],
    [new File([PNG_SIGNATURE], "foo"), "png"],
  ]);

  for (const [file, expected] of testCases) {
    const actual = await routeFile(file);
    assertEquals(
      actual,
      expected,
      `Expected file (${JSON.stringify(file.name)}, type ${
        JSON.stringify(file.type)
      }, sized ${file.size}b) to route to ${expected} (got ${actual})`,
    );
  }
});