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command.spec.js
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command.spec.js
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const EventEmitter = require('events');
const process = require('process');
const Command = require('./command');
const createProcess = () => {
const process = new EventEmitter();
process.pid = 1;
return process;
};
const createProcessWithIO = () => {
const process = createProcess();
return Object.assign(process, {
stdout: new EventEmitter(),
stderr: new EventEmitter(),
stdin: new EventEmitter()
});
};
describe('#start()', () => {
it('spawns process with given command and options', () => {
const spawn = jest.fn().mockReturnValue(createProcess());
const command = new Command({
spawn,
spawnOpts: { bla: true },
command: 'echo foo',
});
command.start();
expect(spawn).toHaveBeenCalledTimes(1);
expect(spawn).toHaveBeenCalledWith(command.command, { bla: true });
});
it('sets stdin, process and PID', () => {
const process = createProcessWithIO();
const command = new Command({ spawn: () => process });
command.start();
expect(command.process).toBe(process);
expect(command.pid).toBe(process.pid);
expect(command.stdin).toBe(process.stdin);
});
it('shares errors to the error stream', done => {
const process = createProcess();
const command = new Command({ spawn: () => process });
command.error.subscribe(data => {
expect(data).toBe('foo');
expect(command.process).toBeUndefined();
done();
});
command.start();
process.emit('error', 'foo');
});
it('shares start and close timing events to the timing stream', done => {
const process = createProcess();
const command = new Command({ spawn: () => process });
const startDate = new Date();
const endDate = new Date(startDate.getTime() + 1000);
jest.spyOn(Date, 'now')
.mockReturnValueOnce(startDate.getTime())
.mockReturnValueOnce(endDate.getTime());
let callCount = 0;
command.timer.subscribe(({startDate: actualStartDate, endDate: actualEndDate}) => {
switch (callCount) {
case 0:
expect(actualStartDate).toStrictEqual(startDate);
expect(actualEndDate).toBeUndefined();
break;
case 1:
expect(actualStartDate).toStrictEqual(startDate);
expect(actualEndDate).toStrictEqual(endDate);
done();
break;
default:
throw new Error('Unexpected call count');
}
callCount++;
});
command.start();
process.emit('close', 0, null);
});
it('shares start and error timing events to the timing stream', done => {
const process = createProcess();
const command = new Command({ spawn: () => process });
const startDate = new Date();
const endDate = new Date(startDate.getTime() + 1000);
jest.spyOn(Date, 'now')
.mockReturnValueOnce(startDate.getTime())
.mockReturnValueOnce(endDate.getTime());
let callCount = 0;
command.timer.subscribe(({startDate: actualStartDate, endDate: actualEndDate}) => {
switch (callCount) {
case 0:
expect(actualStartDate).toStrictEqual(startDate);
expect(actualEndDate).toBeUndefined();
break;
case 1:
expect(actualStartDate).toStrictEqual(startDate);
expect(actualEndDate).toStrictEqual(endDate);
done();
break;
default:
throw new Error('Unexpected call count');
}
callCount++;
});
command.start();
process.emit('error', 0, null);
});
it('shares closes to the close stream with exit code', done => {
const process = createProcess();
const command = new Command({ spawn: () => process });
command.close.subscribe(data => {
expect(data.exitCode).toBe(0);
expect(data.killed).toBe(false);
expect(command.process).toBeUndefined();
done();
});
command.start();
process.emit('close', 0, null);
});
it('shares closes to the close stream with signal', done => {
const process = createProcess();
const command = new Command({ spawn: () => process });
command.close.subscribe(data => {
expect(data.exitCode).toBe('SIGKILL');
expect(data.killed).toBe(false);
done();
});
command.start();
process.emit('close', null, 'SIGKILL');
});
it('shares closes to the close stream with timing information', done => {
const process1 = createProcess();
const command = new Command({ spawn: () => process1 });
const startDate = new Date();
const endDate = new Date(startDate.getTime() + 1000);
jest.spyOn(Date, 'now')
.mockReturnValueOnce(startDate.getTime())
.mockReturnValueOnce(endDate.getTime());
jest.spyOn(process, 'hrtime')
.mockReturnValueOnce([0, 0])
.mockReturnValueOnce([1, 1e8]);
command.close.subscribe(data => {
expect(data.timings.startDate).toStrictEqual(startDate);
expect(data.timings.endDate).toStrictEqual(endDate);
expect(data.timings.durationSeconds).toBe(1.1);
done();
});
command.start();
process1.emit('close', null, 'SIGKILL');
});
it('shares closes to the close stream with command info and index', done => {
const process = createProcess();
const commandInfo = {
command: 'cmd',
name: 'name',
prefixColor: 'green',
env: { VAR: 'yes' },
};
const command = new Command(
Object.assign({
index: 1,
spawn: () => process
}, commandInfo)
);
command.close.subscribe(data => {
expect(data.command).toEqual(commandInfo);
expect(data.killed).toBe(false);
expect(data.index).toBe(1);
done();
});
command.start();
process.emit('close', 0, null);
});
it('shares stdout to the stdout stream', done => {
const process = createProcessWithIO();
const command = new Command({ spawn: () => process });
command.stdout.subscribe(data => {
expect(data.toString()).toBe('hello');
done();
});
command.start();
process.stdout.emit('data', Buffer.from('hello'));
});
it('shares stderr to the stdout stream', done => {
const process = createProcessWithIO();
const command = new Command({ spawn: () => process });
command.stderr.subscribe(data => {
expect(data.toString()).toBe('dang');
done();
});
command.start();
process.stderr.emit('data', Buffer.from('dang'));
});
});
describe('#kill()', () => {
let process, killProcess, command;
beforeEach(() => {
process = createProcess();
killProcess = jest.fn();
command = new Command({ spawn: () => process, killProcess });
});
it('kills process', () => {
command.start();
command.kill();
expect(killProcess).toHaveBeenCalledTimes(1);
expect(killProcess).toHaveBeenCalledWith(command.pid, undefined);
});
it('kills process with some signal', () => {
command.start();
command.kill('SIGKILL');
expect(killProcess).toHaveBeenCalledTimes(1);
expect(killProcess).toHaveBeenCalledWith(command.pid, 'SIGKILL');
});
it('does not try to kill inexistent process', () => {
command.start();
process.emit('error');
command.kill();
expect(killProcess).not.toHaveBeenCalled();
});
it('marks the command as killed', done => {
command.start();
command.close.subscribe(data => {
expect(data.exitCode).toBe(1);
expect(data.killed).toBe(true);
done();
});
command.kill();
process.emit('close', 1, null);
});
});