Documentation Index
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Bun’s test runner includes Jest-compatible mocking.
Mock Function
import { test, expect, mock } from "bun:test";
test("mock function", () => {
const fn = mock((x: number) => x * 2);
fn(5);
fn(10);
expect(fn).toHaveBeenCalledTimes(2);
expect(fn).toHaveBeenCalledWith(5);
});
Spy on Methods
import { test, expect, spyOn } from "bun:test";
const obj = {
method: (x: number) => x * 2
};
test("spy on method", () => {
const spy = spyOn(obj, "method");
obj.method(5);
expect(spy).toHaveBeenCalledWith(5);
});
