init

src/features/TodolistsList/todolists-tasks-reducer.test.ts

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+import {addTodolistAC, TodolistDomainType, todolistsReducer} from './todolists-reducer'
+import {tasksReducer, TasksStateType} from './tasks-reducer'
+import {TodolistType} from '../../api/todolists-api'
+
+test('ids should be equals', () => {
+    const startTasksState: TasksStateType = {};
+    const startTodolistsState: Array<TodolistDomainType> = [];
+
+    let todolist: TodolistType = {
+        title: 'new todolist',
+        id: 'any id',
+        addedDate: '',
+        order: 0
+    }
+
+    const action = addTodolistAC(todolist);
+
+    const endTasksState = tasksReducer(startTasksState, action)
+    const endTodolistsState = todolistsReducer(startTodolistsState, action)
+
+    const keys = Object.keys(endTasksState);
+    const idFromTasks = keys[0];
+    const idFromTodolists = endTodolistsState[0].id;
+
+    expect(idFromTasks).toBe(action.todolist.id);
+    expect(idFromTodolists).toBe(action.todolist.id);
+});