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/**
* @license
* Copyright 2023 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import {describe, it} from 'node:test';
import expect from 'expect';
import sinon from 'sinon';
import {EventEmitter} from '../common/EventEmitter.js';
import {bubble, invokeAtMostOnceForArguments} from './decorators.js';
describe('decorators', function () {
describe('invokeAtMostOnceForArguments', () => {
it('should delegate calls', () => {
const spy = sinon.spy();
class Test {
@invokeAtMostOnceForArguments
test(obj1: object, obj2: object) {
spy(obj1, obj2);
}
}
const t = new Test();
expect(spy.callCount).toBe(0);
const obj1 = {};
const obj2 = {};
t.test(obj1, obj2);
expect(spy.callCount).toBe(1);
});
it('should prevent repeated calls', () => {
const spy = sinon.spy();
class Test {
@invokeAtMostOnceForArguments
test(obj1: object, obj2: object) {
spy(obj1, obj2);
}
}
const t = new Test();
expect(spy.callCount).toBe(0);
const obj1 = {};
const obj2 = {};
t.test(obj1, obj2);
expect(spy.callCount).toBe(1);
expect(spy.lastCall.calledWith(obj1, obj2)).toBeTruthy();
t.test(obj1, obj2);
expect(spy.callCount).toBe(1);
expect(spy.lastCall.calledWith(obj1, obj2)).toBeTruthy();
const obj3 = {};
t.test(obj1, obj3);
expect(spy.callCount).toBe(2);
expect(spy.lastCall.calledWith(obj1, obj3)).toBeTruthy();
});
it('should throw an error for dynamic argumetns', () => {
class Test {
@invokeAtMostOnceForArguments
test(..._args: unknown[]) {}
}
const t = new Test();
t.test({});
expect(() => {
t.test({}, {});
}).toThrow();
});
it('should throw an error for non object arguments', () => {
class Test {
@invokeAtMostOnceForArguments
test(..._args: unknown[]) {}
}
const t = new Test();
expect(() => {
t.test(1);
}).toThrow();
});
});
describe('bubble', () => {
it('should work', () => {
class Test extends EventEmitter<any> {
@bubble()
accessor field = new EventEmitter();
}
const t = new Test();
let a = false;
t.on('a', (value: boolean) => {
a = value;
});
t.field.emit('a', true);
expect(a).toBeTruthy();
// Set a new emitter.
t.field = new EventEmitter();
a = false;
t.field.emit('a', true);
expect(a).toBeTruthy();
});
it('should not bubble down', () => {
class Test extends EventEmitter<any> {
@bubble()
accessor field = new EventEmitter<any>();
}
const t = new Test();
let a = false;
t.field.on('a', (value: boolean) => {
a = value;
});
t.emit('a', true);
expect(a).toBeFalsy();
t.field.emit('a', true);
expect(a).toBeTruthy();
});
});
});
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