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invoke.test.ts
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invoke.test.ts
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import * as execa from 'execa';
import { invoke } from '../../utils/invoke';
import { InvokeOptions } from '../../utils/invokeUtils';
jest.mock('execa');
const execa_mock = execa as jest.Mocked<typeof execa>;
class ExecaChildProcessMock {
public stdout = {
on: jest.fn(),
};
public on = jest.fn();
public catch = jest.fn();
public send = jest.fn();
}
const defaultOptions: InvokeOptions = {
event: 'some event',
handler: 'some handler',
packageFolder: '.',
};
const findEvent = (eventName: string, calls: any[]) => {
return calls.find(call => call[0] == eventName);
};
const callCb = (eventNamel: string, data: any, mocked: jest.Mock) => {
const dataCallback = findEvent(eventNamel, mocked.mock.calls)[1];
dataCallback(data);
};
const EXIT_ERROR = new Error('process finishs with 1');
const exitWithError = (mocked: ExecaChildProcessMock) => {
mocked.catch.mock.calls[0][0](EXIT_ERROR);
};
describe('invoke', () => {
describe('close event happens before exit', () => {
it('should succeed', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
callCb('data', '\n', mockInstance.stdout.on);
callCb(
'data',
JSON.stringify({
result: { attribute: 1 },
}),
mockInstance.stdout.on,
);
//Closes happens before exit
callCb('close', undefined, mockInstance.on);
exitWithError(mockInstance);
await expect(promise).resolves.toEqual({ attribute: 1 });
});
});
describe('close event happens after exit', () => {
it('should succeed', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
callCb('data', '\n', mockInstance.stdout.on);
callCb(
'data',
JSON.stringify({
result: { attribute: 1 },
}),
mockInstance.stdout.on,
);
//Closes happens before exit
exitWithError(mockInstance);
callCb('close', undefined, mockInstance.on);
await expect(promise).resolves.toEqual({ attribute: 1 });
});
});
describe('close event happens up to 2 seconds after exit', () => {
it('should succeed', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
callCb('data', '\n', mockInstance.stdout.on);
callCb(
'data',
JSON.stringify({
result: { attribute: 1 },
}),
mockInstance.stdout.on,
);
//Closes happens before exit
exitWithError(mockInstance);
setTimeout(() => {
callCb('close', undefined, mockInstance.on);
}, 1800);
await expect(promise).resolves.toEqual({ attribute: 1 });
});
it('should reject with error body', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
callCb('data', '\n', mockInstance.stdout.on);
callCb(
'data',
JSON.stringify({
error: 'some error',
}),
mockInstance.stdout.on,
);
//Closes happens before exit
exitWithError(mockInstance);
setTimeout(() => {
callCb('close', undefined, mockInstance.on);
}, 500);
await expect(promise).rejects.toEqual('some error');
});
});
describe('close event happens after 2 seconds after exit', () => {
it('should reject', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
callCb('data', '\n', mockInstance.stdout.on);
callCb(
'data',
JSON.stringify({
result: { attribute: 1 },
}),
mockInstance.stdout.on,
);
//Closes happens before exit
exitWithError(mockInstance);
setTimeout(() => {
callCb('close', undefined, mockInstance.on);
}, 2800);
await expect(promise).rejects.not.toBeNull();
});
});
describe('body with error', () => {
it('should reject', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
callCb('data', '\n', mockInstance.stdout.on);
callCb(
'data',
JSON.stringify({
error: { message: 'some error' },
}),
mockInstance.stdout.on,
);
//Closes happens before exit
exitWithError(mockInstance);
callCb('close', undefined, mockInstance.on);
await expect(promise).rejects.toEqual({
message: 'some error',
});
});
});
describe('without data', () => {
it('should reject', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
//Closes happens before exit
exitWithError(mockInstance);
callCb('close', undefined, mockInstance.on);
await expect(promise).rejects.toEqual(EXIT_ERROR.message);
});
});
describe('body with invalid JSON', () => {
it('should reject', async () => {
const mockInstance = new ExecaChildProcessMock();
execa_mock.node.mockImplementation(file => mockInstance as any);
const promise = invoke(defaultOptions);
const invalidJson = 'Invalid Json {[';
callCb('data', '\n', mockInstance.stdout.on);
callCb('data', invalidJson, mockInstance.stdout.on);
//Closes happens before exit
exitWithError(mockInstance);
callCb('close', undefined, mockInstance.on);
await expect(promise).resolves.toEqual(invalidJson);
});
});
describe('unexpected throw', () => {
it('should reject', async () => {
const error = new Error('unexpected error');
execa_mock.node.mockImplementation(file => {
throw error;
});
const promise = invoke(defaultOptions);
await expect(promise).rejects.toEqual(error);
});
});
});