Sure, here is an example of how to test API calls in TypeScript using Jest and Supertest:

```typescript
import { expect } from "jest";
import { request } from "supertest";

describe("My API", () => {
  it("should return a status code of 200", async () => {
    const response = await request("http://localhost:3000").get("/");
    expect(response.status).toBe(200);
  });

  it("should return the correct data", async () => {
    const response = await request("http://localhost:3000").get("/");
    expect(response.body).toEqual({
      hello: "world",
    });
  });
});
```

This code first imports the `expect` and `request` modules from Jest and Supertest, respectively. Then, it defines a `describe` block with the name of the API being tested. Inside the `describe` block, there are two `it` blocks, each of which tests a different aspect of the API.

The first `it` block tests that the API returns a status code of 200. To do this, it uses the `request` module to make a `get` request to the root endpoint of the API. Then, it uses the `expect` module to assert that the status code of the response is 200.

The second `it` block tests that the API returns the correct data. To do this, it uses the `request` module to make a `get` request to the root endpoint of the API. Then, it uses the `expect` module to assert that the body of the response is equal to the expected data.

To run this test, you can use the `jest` command from the command line. For example, if the file containing the test is called `api.test.ts`, you would run the test by typing the following command:

```
jest api.test.ts
```

If the test passes, you will not see any output from the command line. If the test fails, you will see an error message that tells you what went wrong.

I hope this helps! Let me know if you have any other questions.
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