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import { range as rge, throttle } from 'lodash';
import DirtySubmitForm from '~/dirty_submit/dirty_submit_form';
import { getInputValue, setInputValue, createForm } from './helper';
jest.mock('lodash/throttle', () => jest.fn((fn) => fn));
const lodash = jest.requireActual('lodash');
function expectToToggleDisableOnDirtyUpdate(submit, input) {
const originalValue = getInputValue(input);
expect(submit.disabled).toBe(true);
setInputValue(input, `${originalValue} changes`);
expect(submit.disabled).toBe(false);
setInputValue(input, originalValue);
expect(submit.disabled).toBe(true);
}
describe('DirtySubmitForm', () => {
describe('submit button tests', () => {
it('disables submit until there are changes', () => {
const { form, input, submit } = createForm();
new DirtySubmitForm(form); // eslint-disable-line no-new
expectToToggleDisableOnDirtyUpdate(submit, input);
});
it('disables submit until there are changes when initializing with a falsy value', () => {
const { form, input, submit } = createForm();
input.value = '';
new DirtySubmitForm(form); // eslint-disable-line no-new
expectToToggleDisableOnDirtyUpdate(submit, input);
});
it('disables submit until there are changes for radio inputs', () => {
const { form, input, submit } = createForm('radio');
new DirtySubmitForm(form); // eslint-disable-line no-new
expectToToggleDisableOnDirtyUpdate(submit, input);
});
it('disables submit until there are changes for checkbox inputs', () => {
const { form, input, submit } = createForm('checkbox');
new DirtySubmitForm(form); // eslint-disable-line no-new
expectToToggleDisableOnDirtyUpdate(submit, input);
});
});
describe('throttling tests', () => {
beforeEach(() => {
throttle.mockImplementation(lodash.throttle);
jest.useFakeTimers();
});
afterEach(() => {
throttle.mockReset();
});
it('throttles updates when rapid changes are made to a single form element', () => {
const { form, input } = createForm();
const updateDirtyInputSpy = jest.spyOn(new DirtySubmitForm(form), 'updateDirtyInput');
rge(10).forEach((i) => {
setInputValue(input, `change ${i}`, false);
});
jest.runOnlyPendingTimers();
expect(updateDirtyInputSpy).toHaveBeenCalledTimes(1);
});
it('does not throttle updates when rapid changes are made to different form elements', () => {
const form = document.createElement('form');
const range = rge(10);
range.forEach((i) => {
form.innerHTML += `<input type="text" name="input-${i}" class="js-input-${i}"/>`;
});
const updateDirtyInputSpy = jest.spyOn(new DirtySubmitForm(form), 'updateDirtyInput');
range.forEach((i) => {
const input = form.querySelector(`.js-input-${i}`);
setInputValue(input, `change`, false);
});
jest.runOnlyPendingTimers();
expect(updateDirtyInputSpy).toHaveBeenCalledTimes(range.length);
});
});
});
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