planning

node_modules/@reduxjs/toolkit/src/tests/actionCreatorInvariantMiddleware.test.ts

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+import type { ActionCreatorInvariantMiddlewareOptions } from '@internal/actionCreatorInvariantMiddleware'
+import { getMessage } from '@internal/actionCreatorInvariantMiddleware'
+import { createActionCreatorInvariantMiddleware } from '@internal/actionCreatorInvariantMiddleware'
+import type { Dispatch, MiddlewareAPI } from '@reduxjs/toolkit'
+import { createAction } from '@reduxjs/toolkit'
+
+describe('createActionCreatorInvariantMiddleware', () => {
+  const consoleSpy = jest.spyOn(console, 'warn').mockImplementation(() => {})
+
+  afterEach(() => {
+    consoleSpy.mockClear()
+  })
+  afterAll(() => {
+    consoleSpy.mockRestore()
+  })
+
+  const dummyAction = createAction('aSlice/anAction')
+
+  it('sends the action through the middleware chain', () => {
+    const next: Dispatch = (action) => ({
+      ...action,
+      returned: true,
+    })
+    const dispatch = createActionCreatorInvariantMiddleware()(
+      {} as MiddlewareAPI
+    )(next)
+
+    expect(dispatch(dummyAction())).toEqual({
+      ...dummyAction(),
+      returned: true,
+    })
+  })
+
+  const makeActionTester = (
+    options?: ActionCreatorInvariantMiddlewareOptions
+  ) =>
+    createActionCreatorInvariantMiddleware(options)({} as MiddlewareAPI)(
+      (action) => action
+    )
+
+  it('logs a warning to console if an action creator is mistakenly dispatched', () => {
+    const testAction = makeActionTester()
+
+    testAction(dummyAction())
+
+    expect(consoleSpy).not.toHaveBeenCalled()
+
+    testAction(dummyAction)
+
+    expect(consoleSpy).toHaveBeenLastCalledWith(getMessage(dummyAction.type))
+  })
+
+  it('allows passing a custom predicate', () => {
+    let predicateCalled = false
+    const testAction = makeActionTester({
+      isActionCreator(action): action is Function {
+        predicateCalled = true
+        return false
+      },
+    })
+    testAction(dummyAction())
+    expect(predicateCalled).toBe(true)
+  })
+})