Use browser default time and number formatting with polyfills if needed (#9481)

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

test/common/entity/test_util.ts

@@ -0,0 +1,56 @@
+/* eslint-disable camelcase, no-param-reassign */
+let mockState = 1;
+
+export function createEntity(entity) {
+  mockState++;
+  entity.entity_id = entity.entity_id || `test.test_${mockState}`;
+  entity.last_changed = entity.last_changed || new Date().toISOString();
+  entity.last_updated = entity.last_updated || entity.last_changed;
+  entity.attributes = entity.attributes || {};
+  return entity;
+}
+
+export function createGroup(entity) {
+  mockState++;
+  entity.entity_id = entity.entity_id || `group.test_${mockState}`;
+  entity.state = entity.state || "on";
+  entity.attributes = entity.attributes || {};
+  if (!("order" in entity.attributes)) {
+    entity.attributes.order = 0;
+  }
+  return createEntity(entity);
+}
+
+export function createView(entity) {
+  entity.attributes = entity.attributes || {};
+  entity.attributes.view = true;
+  return createGroup(entity);
+}
+
+export function createLightEntity(isOn?) {
+  mockState++;
+  if (isOn === undefined) {
+    isOn = Math.random() > 0.5;
+  }
+  return createEntity({
+    entity_id: `light.mock_${mockState}`,
+    state: isOn ? "on" : "off",
+  });
+}
+
+export function createEntities(count) {
+  const entities = {};
+  for (let i = 0; i < count; i++) {
+    const entity = createLightEntity();
+    entities[entity.entity_id] = entity;
+  }
+  return entities;
+}
+
+export function entityMap(entityList) {
+  const entities = {};
+  entityList.forEach((entity) => {
+    entities[entity.entity_id] = entity;
+  });
+  return entities;
+}