TypeError: Only absolute URLs are supported

[YasBenAll]

When I'm running the command "yarn jest" in the server folder, I'm getting the following error:

TypeError: Only absolute URLs are supported

  11 | const node_fetch_1 = require("node-fetch");
  12 | test("sends invalid back if bad id sent", () => __awaiter(this, void 0, void 0, function* () {
> 13 |     const response = yield node_fetch_1.default(`${process.env.TEST_HOST}/confirm/12083`);
  14 |     const text = yield response.text();
  15 |     expect(text).toEqual("invalid");
  16 | }));

  at getNodeRequestOptions (packages/server/node_modules/node-fetch/lib/index.js:1284:9)
  at packages/server/node_modules/node-fetch/lib/index.js:1370:19
  at Function.fetch [as default] (packages/server/node_modules/node-fetch/lib/index.js:1367:9)
  at Object.<anonymous> (packages/server/dist/server/src/routes/confirmEmail.test.js:13:28)
  at packages/server/dist/server/src/routes/confirmEmail.test.js:7:71
  at Object.<anonymous>.__awaiter (packages/server/dist/server/src/routes/confirmEmail.test.js:3:12)
  at Object.<anonymous> (packages/server/dist/server/src/routes/confirmEmail.test.js:12:49)

I'm not really sure what I'm supposed to do to fix this problem. The url is not being defined correctly apparently. I'm running this on a windows machine.

process.env.TEST_HOST seems to be undefined, so there's something going wrong when defining process.env