Port @ngrx/entity tests

Author: markerikson

src/entities/entity_state.test.ts

@@ -0,0 +1,33 @@
+import { createEntityAdapter, EntityAdapter } from './index'
+import { BookModel } from './fixtures/book'
+
+describe('Entity State', () => {
+  let adapter: EntityAdapter<BookModel>
+
+  beforeEach(() => {
+    adapter = createEntityAdapter({
+      selectId: (book: BookModel) => book.id
+    })
+  })
+
+  it('should let you get the initial state', () => {
+    const initialState = adapter.getInitialState()
+
+    expect(initialState).toEqual({
+      ids: [],
+      entities: {}
+    })
+  })
+
+  it('should let you provide additional initial state properties', () => {
+    const additionalProperties = { isHydrated: true }
+
+    const initialState = adapter.getInitialState(additionalProperties)
+
+    expect(initialState).toEqual({
+      ...additionalProperties,
+      ids: [],
+      entities: {}
+    })
+  })
+})

src/entities/fixtures/book.ts

@@ -0,0 +1,19 @@
+export interface BookModel {
+  id: string
+  title: string
+}
+
+export const AClockworkOrange: BookModel = Object.freeze({
+  id: 'aco',
+  title: 'A Clockwork Orange'
+})
+
+export const AnimalFarm: BookModel = Object.freeze({
+  id: 'af',
+  title: 'Animal Farm'
+})
+
+export const TheGreatGatsby: BookModel = Object.freeze({
+  id: 'tgg',
+  title: 'The Great Gatsby'
+})