53 lines
1.4 KiB
TypeScript
53 lines
1.4 KiB
TypeScript
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import {afterEach, beforeEach, describe, expect, it, jest} from '@jest/globals';
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import fs from 'fs';
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import {isMainModule} from '../src/is-main-module.js';
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describe('main module detection', () => {
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const originalArgv = process.argv;
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beforeEach(() => {
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process.argv = [process.execPath, 'entrypoint.js'];
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});
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afterEach(() => {
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process.argv = originalArgv;
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jest.restoreAllMocks();
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});
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it.each([undefined, '-'])(
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'skips filesystem access when argv[1] is %s',
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entrypoint => {
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process.argv =
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entrypoint === undefined
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? [process.execPath]
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: [process.execPath, entrypoint];
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const realpath = jest.spyOn(fs, 'realpathSync');
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expect(isMainModule(import.meta.url)).toBe(false);
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expect(realpath).not.toHaveBeenCalled();
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}
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);
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it.each(['ENOENT', 'ENOTDIR'])(
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'treats a non-file entrypoint returning %s as an import',
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code => {
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jest.spyOn(fs, 'realpathSync').mockImplementation(() => {
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throw Object.assign(new Error('No file-based entrypoint'), {code});
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});
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expect(isMainModule(import.meta.url)).toBe(false);
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}
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);
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it('propagates unexpected filesystem errors', () => {
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const error = Object.assign(new Error('Permission denied'), {
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code: 'EACCES'
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});
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jest.spyOn(fs, 'realpathSync').mockImplementation(() => {
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throw error;
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});
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expect(() => isMainModule(import.meta.url)).toThrow(error);
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});
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});
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