41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
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import { expect, test } from "bun:test";
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// Regression test for ENG-22942: Crash when calling expect.extend with non-function values
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// The crash occurred because JSWrappingFunction assumed all callable objects are JSFunction,
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// but class constructors like Expect are callable but not JSFunction instances.
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test("expect.extend with jest object should throw TypeError, not crash", () => {
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const jest = Bun.jest(import.meta.path);
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expect(() => {
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jest.expect.extend(jest);
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}).toThrow(TypeError);
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});
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test("expect.extend with object containing non-function values should throw", () => {
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const jest = Bun.jest(import.meta.path);
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expect(() => {
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jest.expect.extend({
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notAFunction: "string value",
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});
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}).toThrow("expect.extend: `notAFunction` is not a valid matcher");
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});
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test("expect.extend with valid matchers still works", () => {
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const jest = Bun.jest(import.meta.path);
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jest.expect.extend({
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toBeEven(received: number) {
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const pass = received % 2 === 0;
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return {
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message: () => `expected ${received} ${pass ? "not " : ""}to be even`,
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pass,
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};
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},
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});
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jest.expect(4).toBeEven();
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jest.expect(3).not.toBeEven();
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});
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