frappe/cypress/integration/first_day_of_the_week.js

context("First Day of the Week", () => {
	before(() => {
		cy.login();
	});

	beforeEach(() => {
		cy.visit('/app/system-settings');
		cy.findByText('Date and Number Format').click();
	});

	it("Date control starts with same day as selected in System Settings", () => {
		cy.intercept('POST', '/api/method/frappe.core.doctype.system_settings.system_settings.load').as("load_settings");
		cy.fill_field('first_day_of_the_week', 'Tuesday', 'Select');
		cy.findByRole('button', {name: 'Save'}).click();
		cy.wait("@load_settings");
		cy.dialog({
			title: 'Date',
			fields: [
				{
					label: 'Date',
					fieldname: 'date',
					fieldtype: 'Date'
				}
			]
		});
		cy.get_field('date').click();
		cy.get('.datepicker--day-name').eq(0).should('have.text', 'Tu');
	});

	it("Calendar view starts with same day as selected in System Settings", () => {
		cy.intercept('POST', '/api/method/frappe.core.doctype.system_settings.system_settings.load').as("load_settings");
		cy.fill_field('first_day_of_the_week', 'Monday', 'Select');
		cy.findByRole('button', {name: 'Save'}).click();
		cy.wait("@load_settings");
		cy.visit("app/todo/view/calendar/default");
		cy.get('.fc-day-header > span').eq(0).should('have.text', 'Mon');
	});

	after(() => {
		cy.visit('/app/system-settings');
		cy.findByText('Date and Number Format').click();
		cy.fill_field('first_day_of_the_week', 'Sunday', 'Select');
		cy.findByRole('button', {name: 'Save'}).click();
	});
});