aws-cdk/test/util/mock-child_process.js

CDK Toolkit, the command line tool for CDK apps

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.mockSpawn = mockSpawn;
/* eslint-disable import/order */
const child_process = require("child_process");
const events = require("events");
if (!child_process.spawn.mockImplementationOnce) {
    throw new Error('Call "jest.mock(\'child_process\');" at the top of the test file!');
}
function mockSpawn(...invocations) {
    let mock = child_process.spawn;
    for (const _invocation of invocations) {
        const invocation = _invocation; // Mirror into variable for closure
        mock = mock.mockImplementationOnce((binary, options) => {
            expect(binary).toEqual(invocation.commandLine);
            if (invocation.cwd != null) {
                expect(options.cwd).toBe(invocation.cwd);
            }
            if (invocation.sideEffect) {
                invocation.sideEffect();
            }
            const child = new events.EventEmitter();
            child.stdin = new events.EventEmitter();
            child.stdin.write = jest.fn();
            child.stdin.end = jest.fn();
            child.stdout = new events.EventEmitter();
            child.stderr = new events.EventEmitter();
            if (invocation.stdout) {
                mockEmit(child.stdout, 'data', invocation.stdout);
            }
            mockEmit(child, 'close', invocation.exitCode ?? 0);
            mockEmit(child, 'exit', invocation.exitCode ?? 0);
            return child;
        });
    }
    mock.mockImplementation((binary, _options) => {
        throw new Error(`Did not expect call of ${binary}`);
    });
}
/**
 * Must do this on the next tick, as emitter.emit() expects all listeners to have been attached already
 */
function mockEmit(emitter, event, data) {
    setImmediate(() => {
        emitter.emit(event, data);
    });
}
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VudCwgZGF0YSk7XG4gIH0pO1xufVxuIl19