test: Add test cases for form tab break

cypress/fixtures/doctype_with_tab_break.js

@@ -0,0 +1,59 @@
+export default {
+	name: 'Form With Tab Break',
+	custom: 1,
+	actions: [],
+	doctype: 'DocType',
+	engine: 'InnoDB',
+	fields: [
+		{
+			fieldname: 'username',
+			fieldtype: 'Data',
+			label: 'Name',
+			options: 'Name'
+		},
+		{
+			fieldname: 'tab',
+			fieldtype: 'Tab Break',
+			label: 'Tab 2',
+		},
+		{
+			fieldname: 'Phone',
+			fieldtype: 'Data',
+			label: 'Phone',
+			options: 'Phone',
+			reqd: 1
+		},
+	],
+	links: [
+		{
+			"group": "Profile",
+			"link_doctype": "Contact",
+			"link_fieldname": "user"
+		},
+		{
+			"group": "Profile",
+			"link_doctype": "Chat Profile",
+			"link_fieldname": "user"
+		},
+	],
+	modified_by: 'Administrator',
+	module: 'Custom',
+	owner: 'Administrator',
+	permissions: [
+		{
+			create: 1,
+			delete: 1,
+			email: 1,
+			print: 1,
+			read: 1,
+			role: 'System Manager',
+			share: 1,
+			write: 1
+		}
+	],
+	quick_entry: 1,
+	autoname: "format: Test-{####}",
+	sort_field: 'modified',
+	sort_order: 'ASC',
+	track_changes: 1
+};

cypress/integration/form_tab_break.js

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+import doctype_with_tab_break from '../fixtures/doctype_with_tab_break';
+const doctype_name = doctype_with_tab_break.name;
+context("Form Tab Break", () => {
+	before(() => {
+		cy.login();
+		cy.visit('/app/website');
+		return cy.insert_doc('DocType', doctype_with_tab_break, true);
+	});
+	it("Should switch tab and open correct tabs on validation error", () => {
+		cy.new_form(doctype_name);
+		// test tab switch
+		cy.findByRole("tab", {name: "Tab 2"}).click();
+		cy.findByText("Phone");
+		cy.findByRole("tab", {name: "Details"}).click();
+		cy.findByText("Name");
+
+		// form should switch to the tab with un-filled mandatory field
+		cy.fill_field("username", "Test");
+		cy.findByRole("button", {name: "Save"}).click();
+		cy.findByText("Missing Fields");
+		cy.hide_dialog();
+		cy.findByText("Phone");
+		cy.fill_field("phone", "12345678");
+		cy.findByRole("button", {name: "Save"}).click();
+
+		// After save, first tab should have dashboard
+		cy.get(".form-tabs > .nav-item").eq(0).click();
+		cy.findByText("Connections");
+
+	});
+});