planning

node_modules/@reduxjs/toolkit/src/entities/tests/utils.spec.ts

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+import { AClockworkOrange } from './fixtures/book'
+
+describe('Entity utils', () => {
+  describe(`selectIdValue()`, () => {
+    const OLD_ENV = process.env
+
+    beforeEach(() => {
+      jest.resetModules() // this is important - it clears the cache
+      process.env = { ...OLD_ENV, NODE_ENV: 'development' }
+    })
+
+    afterEach(() => {
+      process.env = OLD_ENV
+      jest.resetAllMocks()
+    })
+
+    it('should not warn when key does exist', () => {
+      const { selectIdValue } = require('../utils')
+      const spy = jest.spyOn(console, 'warn')
+
+      selectIdValue(AClockworkOrange, (book: any) => book.id)
+      expect(spy).not.toHaveBeenCalled()
+    })
+
+    it('should warn when key does not exist in dev mode', () => {
+      const { selectIdValue } = require('../utils')
+      const spy = jest.spyOn(console, 'warn')
+
+      selectIdValue(AClockworkOrange, (book: any) => book.foo)
+
+      expect(spy).toHaveBeenCalled()
+    })
+
+    it('should warn when key is undefined in dev mode', () => {
+      const { selectIdValue } = require('../utils')
+      const spy = jest.spyOn(console, 'warn')
+
+      const undefinedAClockworkOrange = { ...AClockworkOrange, id: undefined }
+      selectIdValue(undefinedAClockworkOrange, (book: any) => book.id)
+
+      expect(spy).toHaveBeenCalled()
+    })
+
+    it('should not warn when key does not exist in prod mode', () => {
+      process.env.NODE_ENV = 'production'
+      const { selectIdValue } = require('../utils')
+      const spy = jest.spyOn(console, 'warn')
+
+      selectIdValue(AClockworkOrange, (book: any) => book.foo)
+
+      expect(spy).not.toHaveBeenCalled()
+    })
+
+    it('should not warn when key is undefined in prod mode', () => {
+      process.env.NODE_ENV = 'production'
+      const { selectIdValue } = require('../utils')
+      const spy = jest.spyOn(console, 'warn')
+
+      const undefinedAClockworkOrange = { ...AClockworkOrange, id: undefined }
+      selectIdValue(undefinedAClockworkOrange, (book: any) => book.id)
+
+      expect(spy).not.toHaveBeenCalled()
+    })
+  })
+})