bun-bagel is a mocking library specifically designed for Bun's fetch API. It enables developers to easily intercept fetch requests and provide custom mock responses, streamlining the development and testing process of Bun applications.
:warning: The library is yet only experimental and might change over time.
import { mock } from "bun-bagel";
// Register the mock for the example URL.
mock("https://example.com/api/users/*", { data: { name: "Foo" } });
// Make a fetch request to the mocked URL
const response = await fetch("https://example.com/api/users/123");
// Print the response body
console.log(await response.json());
{ name: "Foo" }
bun install bun-bagel
import { describe, test, expect, afterEach } from "bun:test";
import { mock, clearMocks } from "bun-bagel";
describe("Unit Test", () => {
afterEach(() => {
clearMocks();
});
test("Mock Fetch", async () => {
// Register the mock for the example URL.
mock("https://example.com/api/users/*", { data: { name: "Foo" } });
// Call a function that uses the fetch method.
const response = await fetchSomeData();
// Print the response body
console.log(await response.json()); // => { name: "Foo" }
});
});
import { mock } from "bun-bagel";
import type { MockOptions } from "bun-bagel";
const options: MockOptions = {
method: "POST",
headers: { "x-foo-bar": "baz" },
response: {
data: { name: "Foo" },
}
};
// Register the mock for the example URL.
mock("https://example.com/api/users/*", options);
// Make a fetch request to the mocked URL
const response = await fetch("https://example.com/api/users/123", { headers: { "x-foo-bar": "baz" } });
// Requests without the headers will not be matched.
const response2 = await fetch("https://example.com/api/users/123");
// Check the response body.
console.log(await response.json()); // => { name: "Foo" }
import { mock } from "bun-bagel";
import type { MockOptions } from "bun-bagel";
const options: MockOptions = {
response: {
data: { name: "Foo" },
status: 404,
headers: { "x-foo-bar": "baz" },
}
};
// Register the mock for the example URL.
mock("https://example.com/api/users/*", options);
// Make a fetch request to the mocked URL
const response = await fetch("https://example.com/api/users/123");
// Check the status and headers.
console.log(response.status); // => 404
console.log(response.headers); // => { "x-foo-bar": "baz" }
Contributions are welcome! Please see the CONTRIBUTING.md file for details.
To contribute to bun-bagel, follow these steps:
git clone https://github.com/DRFR0ST/bun-bagel.git
bun install
bun test
bun run check
bun run build
[!NOTE] You can also play around with bun-bagel by making changes in the
/sandbox
directory and runningbun run sandbox
. Make sure to build the library after making changes in the/src
directory.
Join the discussion on the GitHub Discussions page.
This project is licensed under the terms of the MIT license. See the LICENSE file for details.