jest.mock('child_process', () => {
return {
spawn: jest.fn(),
};
});
import { EventEmitter } from 'events';
import * as os from 'os';
import * as path from 'path';
import { spawn } from 'child_process';
import { CrossPlatformUtils } from '@shared/utils/CrossPlatformUtils';
const typedSpawn = spawn as unknown as jest.Mock;
describe('CrossPlatformUtils – commandExists & diagnostic export helpers', () => {
beforeEach(() => {
typedSpawn.mockReset();
});
describe('commandExists', () => {
it('resolves true when the spawned process exits with code 0', async () => {
const emitter = new EventEmitter();
typedSpawn.mockReturnValue(emitter);
const promise = CrossPlatformUtils.commandExists('node');
// Simulate successful exit
emitter.emit('close', 0);
await expect(promise).resolves.toBe(true);
});
it('resolves false when the spawned process exits with non-zero code', async () => {
const emitter = new EventEmitter();
typedSpawn.mockReturnValue(emitter);
const promise = CrossPlatformUtils.commandExists('nonexistent');
// Simulate failure exit
emitter.emit('close', 1);
await expect(promise).resolves.toBe(false);
});
it('resolves false when the spawned process emits an error event', async () => {
const emitter = new EventEmitter();
typedSpawn.mockReturnValue(emitter);
const promise = CrossPlatformUtils.commandExists('badcmd');
// Simulate error event
emitter.emit('error', new Error('spawn error'));
await expect(promise).resolves.toBe(false);
});
it('invokes the correct platform checker (which/where) based on runtime platform', async () => {
const emitter = new EventEmitter();
typedSpawn.mockReturnValue(emitter);
const promise = CrossPlatformUtils.commandExists('npm');
const expectedChecker = process.platform === 'win32' ? 'where' : 'which';
expect(typedSpawn).toHaveBeenCalledWith(
expectedChecker,
['npm'],
expect.objectContaining({ shell: process.platform === 'win32' })
);
// Resolve promise to avoid unhandled promise rejection warnings
emitter.emit('close', 0);
await promise;
});
});
describe('getDiagnosticExportPath', () => {
it('returns a path in the system temporary directory', () => {
const exportPath = CrossPlatformUtils.getDiagnosticExportPath();
expect(exportPath).toBe(path.join(os.tmpdir(), 'vscode-diagnostics-export.json'));
// Ensure the path is absolute for safety
expect(path.isAbsolute(exportPath)).toBe(true);
});
});
});
