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joplin/packages/lib/eventManager.test.js
2021-05-21 15:17:21 +02:00

117 lines
2.3 KiB
JavaScript

'use strict';
const { checkThrow } = require('./testing/test-utils.js');
const eventManager = require('./eventManager').default;
describe('eventManager', function() {
beforeEach(async (done) => {
eventManager.reset();
done();
});
afterEach(async (done) => {
eventManager.reset();
done();
});
it('should watch state props', (async () => {
let localStateName = '';
let callCount = 0;
function nameWatch(event) {
callCount++;
localStateName = event.value;
}
const globalState = {
name: 'john',
};
eventManager.appStateOn('name', nameWatch);
eventManager.appStateEmit(globalState);
expect(localStateName).toBe('john');
globalState.name = 'paul';
eventManager.appStateEmit(globalState);
expect(localStateName).toBe('paul');
expect(callCount).toBe(2);
eventManager.appStateEmit(globalState);
expect(callCount).toBe(2);
}));
it('should unwatch state props', (async () => {
let localStateName = '';
function nameWatch(event) {
localStateName = event.value;
}
const globalState = {
name: 'john',
};
eventManager.appStateOn('name', nameWatch);
eventManager.appStateOff('name', nameWatch);
eventManager.appStateEmit(globalState);
expect(localStateName).toBe('');
}));
it('should watch nested props', (async () => {
let localStateName = '';
function nameWatch(event) {
localStateName = event.value;
}
const globalState = {
user: {
name: 'john',
},
};
eventManager.appStateOn('user.name', nameWatch);
eventManager.appStateEmit(globalState);
expect(localStateName).toBe('john');
globalState.user.name = 'paul';
eventManager.appStateEmit(globalState);
expect(localStateName).toBe('paul');
}));
it('should not be possible to modify state props', (async () => {
let localUser = {};
function userWatch(event) {
// Normally, the user should not keep a reference to the whole object
// but make a copy. However, if they do keep a reference and try to
// modify it, it should throw an exception as that would be an attempt
// to directly modify the Redux state.
localUser = event.value;
}
const globalState = {
user: {
name: 'john',
},
};
eventManager.appStateOn('user', userWatch);
eventManager.appStateEmit(globalState);
expect(checkThrow(() => localUser.name = 'paul')).toBe(true);
}));
});