import { file, gc, Serve, serve, Server } from "bun";
import { afterEach, describe, it, expect, afterAll } from "bun:test";
import { readFileSync, writeFileSync } from "fs";
import { resolve } from "path";

afterEach(() => gc(true));

const count = 200;
let port = 10000;
let server: Server | undefined;

async function runTest({ port, ...serverOptions }: Serve<any>, test: (server: Serve<any>) => Promise<void> | void) {
  if (server) {
    server.reload({ ...serverOptions, port: 0 });
  } else {
    while (!server) {
      try {
        server = serve({ ...serverOptions, port: 0 });
        break;
      } catch (e: any) {
        if (e?.message !== `Failed to start server `) {
          throw e;
        }
      }
    }
  }

  await test(server);
}

afterAll(() => {
  if (server) {
    server.stop(true);
    server = undefined;
  }
});

[100, 101, 418, 999].forEach(statusCode => {
  it(`should response with HTTP status code (${statusCode})`, async () => {
    await runTest(
      {
        fetch() {
          return new Response("Foo Bar", { status: statusCode });
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(response.status).toBe(statusCode);
        expect(await response.text()).toBe("Foo Bar");
      },
    );
  });
});

[-200, 42, 12345, Math.PI].forEach(statusCode => {
  it(`should ignore invalid HTTP status code (${statusCode})`, async () => {
    await runTest(
      {
        fetch() {
          return new Response("Foo Bar", { status: statusCode });
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(response.status).toBe(200);
        expect(await response.text()).toBe("Foo Bar");
      },
    );
  });
});

it("should display a welcome message when the response value type is incorrect", async () => {
  await runTest(
    {
      fetch(req) {
        return Symbol("invalid response type");
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      const text = await response.text();
      expect(text).toContain("Welcome to Bun!");
    },
  );
});

it("request.signal works in trivial case", async () => {
  var aborty = new AbortController();
  var didAbort = false;
  await runTest(
    {
      async fetch(req) {
        req.signal.addEventListener("abort", () => {
          didAbort = true;
        });
        expect(didAbort).toBe(false);
        aborty.abort();
        await Bun.sleep(2);
        return new Response("Test failed!");
      },
    },
    async server => {
      try {
        await fetch(`http://${server.hostname}:${server.port}`, { signal: aborty.signal });
        throw new Error("Expected fetch to throw");
      } catch (e: any) {
        expect(e.name).toBe("AbortError");
      }
      await Bun.sleep(1);

      expect(didAbort).toBe(true);
    },
  );
});

it("request.signal works in leaky case", async () => {
  var aborty = new AbortController();
  var didAbort = false;
  var leaky;
  await runTest(
    {
      async fetch(req) {
        leaky = req;
        expect(didAbort).toBe(false);
        aborty.abort();
        await Bun.sleep(2);
        return new Response("Test failed!");
      },
    },
    async server => {
      try {
        const resp = fetch(`http://${server.hostname}:${server.port}`, { signal: aborty.signal });

        await Bun.sleep(1);

        leaky.signal.addEventListener("abort", () => {
          didAbort = true;
        });

        await resp;

        throw new Error("Expected fetch to throw");
      } catch (e: any) {
        expect(e.name).toBe("AbortError");
      }

      await Bun.sleep(1);

      expect(didAbort).toBe(true);
    },
  );
});

it("should work for a file", async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  const textToExpect = readFileSync(fixture, "utf-8");
  await runTest(
    {
      fetch(req) {
        return new Response(file(fixture));
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      expect(await response.text()).toBe(textToExpect);
    },
  );
});

it("request.url should log successfully", async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  const textToExpect = readFileSync(fixture, "utf-8");
  var expected;
  await runTest(
    {
      fetch(req) {
        expect(Bun.inspect(req).includes(expected)).toBe(true);
        return new Response(file(fixture));
      },
    },
    async server => {
      expected = `http://localhost:${server.port}/helloooo`;
      const response = await fetch(expected);
      expect(response.url).toBe(expected);
      expect(await response.text()).toBe(textToExpect);
    },
  );
});

it("request.url should be based on the Host header", async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  const textToExpect = readFileSync(fixture, "utf-8");
  await runTest(
    {
      fetch(req) {
        expect(req.url).toBe("http://example.com/helloooo");
        return new Response(file(fixture));
      },
    },
    async server => {
      const expected = `http://${server.hostname}:${server.port}/helloooo`;
      const response = await fetch(expected, {
        headers: {
          Host: "example.com",
        },
      });
      expect(response.url).toBe(expected);
      expect(await response.text()).toBe(textToExpect);
    },
  );
});

describe("streaming", () => {
  describe("error handler", () => {
    it("throw on pull reports an error and close the connection", async () => {
      var pass = false;
      await runTest(
        {
          error(e) {
            pass = true;
            return new Response("PASS", { status: 555 });
          },
          fetch(req) {
            return new Response(
              new ReadableStream({
                pull(controller) {
                  throw new Error("FAIL");
                },
              }),
            );
          },
        },
        async server => {
          const response = await fetch(`http://${server.hostname}:${server.port}`);
          if (response.status > 0) {
            expect(response.status).toBe(555);
            expect(await response.text()).toBe("PASS");
          }
          expect(pass).toBe(true);
        },
      );
    });

    it("throw on pull after writing should not call the error handler", async () => {
      var pass = true;
      await runTest(
        {
          error(e) {
            pass = false;
            return new Response("FAIL", { status: 555 });
          },
          fetch(req) {
            return new Response(
              new ReadableStream({
                async pull(controller) {
                  controller.enqueue("PASS");
                  controller.close();
                  throw new Error("error");
                },
              }),
            );
          },
        },
        async server => {
          const response = await fetch(`http://${server.hostname}:${server.port}`);
          // connection terminated
          expect(response.status).toBe(200);
          expect(await response.text()).toBe("PASS");
          expect(pass).toBe(true);
        },
      );
    });
  });

  it("text from JS, one chunk", async () => {
    const relative = new URL("./fetch.js.txt", import.meta.url);
    const textToExpect = readFileSync(relative, "utf-8");
    await runTest(
      {
        fetch(req) {
          return new Response(
            new ReadableStream({
              start(controller) {
                controller.enqueue(textToExpect);
                controller.close();
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        const text = await response.text();
        expect(text.length).toBe(textToExpect.length);
        expect(text).toBe(textToExpect);
      },
    );
  });
  it("text from JS, two chunks", async () => {
    const fixture = resolve(import.meta.dir, "./fetch.js.txt");
    const textToExpect = readFileSync(fixture, "utf-8");
    await runTest(
      {
        fetch(req) {
          return new Response(
            new ReadableStream({
              start(controller) {
                controller.enqueue(textToExpect.substring(0, 100));
                controller.enqueue(textToExpect.substring(100));
                controller.close();
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(await response.text()).toBe(textToExpect);
      },
    );
  });

  it("Error handler is called when a throwing stream hasn't written anything", async () => {
    await runTest(
      {
        error(e) {
          return new Response("Test Passed", { status: 200 });
        },

        fetch(req) {
          return new Response(
            new ReadableStream({
              start(controller) {
                throw new Error("Test Passed");
              },
            }),
            {
              status: 404,
            },
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(response.status).toBe(200);
        expect(await response.text()).toBe("Test Passed");
      },
    );
  });

  // Also verifies error handler reset in `.reload()` due to test above
  it("text from JS throws on start with no error handler", async () => {
    await runTest(
      {
        error: undefined,

        fetch(req) {
          return new Response(
            new ReadableStream({
              start(controller) {
                throw new Error("Test Passed");
              },
            }),
            {
              status: 420,
              headers: {
                "x-what": "123",
              },
            },
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(response.status).toBe(500);
      },
    );
  });

  it("text from JS throws on start has error handler", async () => {
    var pass = false;
    var err;
    await runTest(
      {
        error(e) {
          pass = true;
          err = e;
          return new Response("Fail", { status: 500 });
        },
        fetch(req) {
          return new Response(
            new ReadableStream({
              start(controller) {
                throw new TypeError("error");
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(response.status).toBe(500);
        expect(await response.text()).toBe("Fail");
        expect(pass).toBe(true);
        expect(err?.name).toBe("TypeError");
        expect(err?.message).toBe("error");
      },
    );
  });

  it("text from JS, 2 chunks, with delay", async () => {
    const fixture = resolve(import.meta.dir, "./fetch.js.txt");
    const textToExpect = readFileSync(fixture, "utf-8");
    await runTest(
      {
        fetch(req) {
          return new Response(
            new ReadableStream({
              start(controller) {
                controller.enqueue(textToExpect.substring(0, 100));
                queueMicrotask(() => {
                  controller.enqueue(textToExpect.substring(100));
                  controller.close();
                });
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(await response.text()).toBe(textToExpect);
      },
    );
  });

  it("text from JS, 1 chunk via pull()", async () => {
    const fixture = resolve(import.meta.dir, "./fetch.js.txt");
    const textToExpect = readFileSync(fixture, "utf-8");
    await runTest(
      {
        fetch(req) {
          return new Response(
            new ReadableStream({
              pull(controller) {
                controller.enqueue(textToExpect);
                controller.close();
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        const text = await response.text();
        expect(text).toBe(textToExpect);
      },
    );
  });

  it("text from JS, 2 chunks, with delay in pull", async () => {
    const fixture = resolve(import.meta.dir, "./fetch.js.txt");
    const textToExpect = readFileSync(fixture, "utf-8");
    await runTest(
      {
        fetch(req) {
          return new Response(
            new ReadableStream({
              pull(controller) {
                controller.enqueue(textToExpect.substring(0, 100));
                queueMicrotask(() => {
                  controller.enqueue(textToExpect.substring(100));
                  controller.close();
                });
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(await response.text()).toBe(textToExpect);
      },
    );
  });

  it("text from JS, 3 chunks, 1 empty, with delay in pull", async () => {
    const textToExpect = "hello world";
    const groups = [
      ["hello", "", " world"],
      ["", "hello ", "world"],
      ["hello ", "world", ""],
      ["hello world", "", ""],
      ["", "", "hello world"],
    ];
    var count = 0;

    for (const chunks of groups) {
      await runTest(
        {
          fetch(req) {
            return new Response(
              new ReadableStream({
                async pull(controller) {
                  for (let chunk of chunks) {
                    controller.enqueue(Buffer.from(chunk));
                    await 1;
                  }
                  await 1;
                  controller.close();
                },
              }),
            );
          },
        },
        async server => {
          const response = await fetch(`http://${server.hostname}:${server.port}`);
          expect(await response.text()).toBe(textToExpect);
          count++;
        },
      );
    }
    expect(count).toBe(groups.length);
  });

  it("text from JS, 2 chunks, with async pull", async () => {
    const fixture = resolve(import.meta.dir, "./fetch.js.txt");
    const textToExpect = readFileSync(fixture, "utf-8");
    await runTest(
      {
        fetch(req) {
          return new Response(
            new ReadableStream({
              async pull(controller) {
                controller.enqueue(textToExpect.substring(0, 100));
                await Promise.resolve();
                controller.enqueue(textToExpect.substring(100));
                await Promise.resolve();
                controller.close();
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(await response.text()).toBe(textToExpect);
      },
    );
  });

  it("text from JS, 10 chunks, with async pull", async () => {
    const fixture = resolve(import.meta.dir, "./fetch.js.txt");
    const textToExpect = readFileSync(fixture, "utf-8");
    await runTest(
      {
        fetch(req) {
          return new Response(
            new ReadableStream({
              async pull(controller) {
                var remain = textToExpect;
                for (let i = 0; i < 10 && remain.length > 0; i++) {
                  controller.enqueue(remain.substring(0, 100));
                  remain = remain.substring(100);
                  await new Promise(resolve => queueMicrotask(resolve));
                }

                controller.enqueue(remain);
                controller.close();
              },
            }),
          );
        },
      },
      async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(await response.text()).toBe(textToExpect);
      },
    );
  });
});

it("should work for a hello world", async () => {
  await runTest(
    {
      fetch(req) {
        return new Response(`Hello, world!`);
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      expect(await response.text()).toBe("Hello, world!");
    },
  );
});

it("should work for a blob", async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  const textToExpect = readFileSync(fixture, "utf-8");
  await runTest(
    {
      fetch(req) {
        return new Response(new Blob([textToExpect]));
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      expect(await response.text()).toBe(textToExpect);
    },
  );
});

it("should work for a blob stream", async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  const textToExpect = readFileSync(fixture, "utf-8");
  await runTest(
    {
      fetch(req) {
        return new Response(new Blob([textToExpect]).stream());
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      expect(await response.text()).toBe(textToExpect);
    },
  );
});

it("should work for a file stream", async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  const textToExpect = readFileSync(fixture, "utf-8");
  await runTest(
    {
      fetch(req) {
        return new Response(file(fixture).stream());
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      expect(await response.text()).toBe(textToExpect);
    },
  );
});

it("fetch should work with headers", async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  await runTest(
    {
      fetch(req) {
        if (req.headers.get("X-Foo") !== "bar") {
          return new Response("X-Foo header not set", { status: 500 });
        }
        return new Response(file(fixture), {
          headers: { "X-Both-Ways": "1" },
        });
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`, {
        headers: {
          "X-Foo": "bar",
        },
      });
      expect(response.status).toBe(200);
      expect(response.headers.get("X-Both-Ways")).toBe("1");
    },
  );
});

it(`should work for a file ${count} times serial`, async () => {
  const fixture = resolve(import.meta.dir, "./fetch.js.txt");
  const textToExpect = readFileSync(fixture, "utf-8");
  await runTest(
    {
      async fetch(req) {
        return new Response(file(fixture));
      },
    },
    async server => {
      for (let i = 0; i < count; i++) {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(await response.text()).toBe(textToExpect);
      }
    },
  );
});

it(`should work for ArrayBuffer ${count} times serial`, async () => {
  const textToExpect = "hello";
  await runTest(
    {
      fetch(req) {
        return new Response(new TextEncoder().encode(textToExpect));
      },
    },
    async server => {
      for (let i = 0; i < count; i++) {
        const response = await fetch(`http://${server.hostname}:${server.port}`);
        expect(await response.text()).toBe(textToExpect);
      }
    },
  );
});

describe("parallel", () => {
  it(`should work for text ${count} times in batches of 5`, async () => {
    const textToExpect = "hello";
    await runTest(
      {
        fetch(req) {
          return new Response(textToExpect);
        },
      },
      async server => {
        for (let i = 0; i < count; ) {
          let responses = await Promise.all([
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
          ]);

          for (let response of responses) {
            expect(await response.text()).toBe(textToExpect);
          }
          i += responses.length;
        }
      },
    );
  });
  it(`should work for Uint8Array ${count} times in batches of 5`, async () => {
    const textToExpect = "hello";
    await runTest(
      {
        fetch(req) {
          return new Response(new TextEncoder().encode(textToExpect));
        },
      },
      async server => {
        for (let i = 0; i < count; ) {
          let responses = await Promise.all([
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
            fetch(`http://${server.hostname}:${server.port}`),
          ]);

          for (let response of responses) {
            expect(await response.text()).toBe(textToExpect);
          }
          i += responses.length;
        }
      },
    );
  });
});

it("should support reloading", async () => {
  const first = req => new Response("first");
  const second = req => new Response("second");
  await runTest(
    {
      fetch: first,
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      expect(await response.text()).toBe("first");
      server.reload({ fetch: second });
      const response2 = await fetch(`http://${server.hostname}:${server.port}`);
      expect(await response2.text()).toBe("second");
    },
  );
});

describe("status code text", () => {
  const fixture = {
    200: "OK",
    201: "Created",
    202: "Accepted",
    203: "Non-Authoritative Information",
    204: "No Content",
    205: "Reset Content",
    206: "Partial Content",
    207: "Multi-Status",
    208: "Already Reported",
    226: "IM Used",
    300: "Multiple Choices",
    301: "Moved Permanently",
    302: "Found",
    303: "See Other",
    304: "Not Modified",
    305: "Use Proxy",
    306: "Switch Proxy",
    307: "Temporary Redirect",
    308: "Permanent Redirect",
    400: "Bad Request",
    401: "Unauthorized",
    402: "Payment Required",
    403: "Forbidden",
    404: "Not Found",
    405: "Method Not Allowed",
    406: "Not Acceptable",
    407: "Proxy Authentication Required",
    408: "Request Timeout",
    409: "Conflict",
    410: "Gone",
    411: "Length Required",
    412: "Precondition Failed",
    413: "Payload Too Large",
    414: "URI Too Long",
    415: "Unsupported Media Type",
    416: "Range Not Satisfiable",
    417: "Expectation Failed",
    418: "I'm a Teapot",
    421: "Misdirected Request",
    422: "Unprocessable Entity",
    423: "Locked",
    424: "Failed Dependency",
    425: "Too Early",
    426: "Upgrade Required",
    428: "Precondition Required",
    429: "Too Many Requests",
    431: "Request Header Fields Too Large",
    451: "Unavailable For Legal Reasons",
    500: "Internal Server Error",
    501: "Not Implemented",
    502: "Bad Gateway",
    503: "Service Unavailable",
    504: "Gateway Timeout",
    505: "HTTP Version Not Supported",
    506: "Variant Also Negotiates",
    507: "Insufficient Storage",
    508: "Loop Detected",
    510: "Not Extended",
    511: "Network Authentication Required",
  };

  for (let code in fixture) {
    it(`should return ${code} ${fixture[code]}`, async () => {
      await runTest(
        {
          fetch(req) {
            return new Response("hey", { status: +code });
          },
        },
        async server => {
          const response = await fetch(`http://${server.hostname}:${server.port}`);
          expect(response.status).toBe(parseInt(code));
          expect(response.statusText).toBe(fixture[code]);
        },
      );
    });
  }
});

it("should support multiple Set-Cookie headers", async () => {
  await runTest(
    {
      fetch(req) {
        return new Response("hello", {
          headers: [
            ["Another-Header", "1"],
            ["Set-Cookie", "foo=bar"],
            ["Set-Cookie", "baz=qux"],
          ],
        });
      },
    },
    async server => {
      const response = await fetch(`http://${server.hostname}:${server.port}`);
      expect(response.headers.getAll("Set-Cookie")).toEqual(["foo=bar", "baz=qux"]);
      expect(response.headers.get("Set-Cookie")).toEqual("foo=bar, baz=qux");

      const cloned = response.clone().headers;
      expect(response.headers.getAll("Set-Cookie")).toEqual(["foo=bar", "baz=qux"]);

      response.headers.delete("Set-Cookie");
      expect(response.headers.getAll("Set-Cookie")).toEqual([]);
      response.headers.delete("Set-Cookie");
      expect(cloned.getAll("Set-Cookie")).toEqual(["foo=bar", "baz=qux"]);
      expect(new Headers(cloned).getAll("Set-Cookie")).toEqual(["foo=bar", "baz=qux"]);
    },
  );
});

describe("should support Content-Range with Bun.file()", () => {
  // this must be a big file so we can test potentially multiple chunks
  // more than 65 KB
  const full = (function () {
    const fixture = resolve(import.meta.dir + "/fetch.js.txt");
    const chunk = readFileSync(fixture);
    var whole = new Uint8Array(chunk.byteLength * 128);
    for (var i = 0; i < 128; i++) {
      whole.set(chunk, i * chunk.byteLength);
    }
    writeFileSync(fixture + ".big", whole);
    return whole;
  })();
  const fixture = resolve(import.meta.dir + "/fetch.js.txt") + ".big";
  const getServer = runTest.bind(null, {
    fetch(req) {
      const { searchParams } = new URL(req.url);
      const start = Number(searchParams.get("start"));
      const end = Number(searchParams.get("end"));
      return new Response(Bun.file(fixture).slice(start, end));
    },
  });

  const good = [
    [0, 1],
    [1, 2],
    [0, 10],
    [10, 20],
    [0, Infinity],
    [10, Infinity],
    [NaN, Infinity],
    [full.byteLength - 10, full.byteLength],
    [full.byteLength - 10, full.byteLength - 1],
    [full.byteLength - 1, full.byteLength],
    [0, full.byteLength],
  ] as const;

  for (const [start, end] of good) {
    it(`good range: ${start} - ${end}`, async () => {
      await getServer(async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}/?start=${start}&end=${end}`, {
          verbose: true,
        });
        expect(await response.arrayBuffer()).toEqual(full.buffer.slice(start, end));
        expect(response.status).toBe(start > 0 || end < full.byteLength ? 206 : 200);
      });
    });
  }

  const emptyRanges = [
    [0, 0],
    [1, 1],
    [10, 10],
    [-Infinity, -Infinity],
    [Infinity, Infinity],
    [NaN, NaN],
    [(full.byteLength / 2) | 0, (full.byteLength / 2) | 0],
    [full.byteLength, full.byteLength],
    [full.byteLength - 1, full.byteLength - 1],
  ];

  for (const [start, end] of emptyRanges) {
    it(`empty range: ${start} - ${end}`, async () => {
      await getServer(async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}/?start=${start}&end=${end}`);
        const out = await response.arrayBuffer();
        expect(out).toEqual(new ArrayBuffer(0));
        expect(response.status).toBe(206);
      });
    });
  }

  const badRanges = [
    [10, NaN],
    [10, -Infinity],
    [-(full.byteLength / 2) | 0, Infinity],
    [-(full.byteLength / 2) | 0, -Infinity],
    [full.byteLength + 100, full.byteLength],
    [full.byteLength + 100, full.byteLength + 100],
    [full.byteLength + 100, full.byteLength + 1],
    [full.byteLength + 100, -full.byteLength],
  ];

  for (const [start, end] of badRanges) {
    it(`bad range: ${start} - ${end}`, async () => {
      await getServer(async server => {
        const response = await fetch(`http://${server.hostname}:${server.port}/?start=${start}&end=${end}`);
        const out = await response.arrayBuffer();
        expect(out).toEqual(new ArrayBuffer(0));
        expect(response.status).toBe(206);
      });
    });
  }
});