Convert to ESM

__tests__/main.test.js

@@ -1,96 +1,62 @@
 /**
  * Unit tests for the action's main functionality, src/main.js
+ *
+ * To mock dependencies in ESM, you can create fixtures that export mock
+ * functions and objects. For example, the core module is mocked in this test,
+ * so that the actual '@actions/core' module is not imported.
  */
-const core = require('@actions/core')
-const main = require('../src/main')
+import { jest } from '@jest/globals'
+import * as core from '../__fixtures__/core.js'
+import { wait } from '../__fixtures__/wait.js'
 
-// Mock the GitHub Actions core library
-const debugMock = jest.spyOn(core, 'debug').mockImplementation()
-const getInputMock = jest.spyOn(core, 'getInput').mockImplementation()
-const setFailedMock = jest.spyOn(core, 'setFailed').mockImplementation()
-const setOutputMock = jest.spyOn(core, 'setOutput').mockImplementation()
+// Mocks should be declared before the module being tested is imported.
+jest.unstable_mockModule('@actions/core', () => core)
+jest.unstable_mockModule('../src/wait.js', () => ({ wait }))
 
-// Mock the action's main function
-const runMock = jest.spyOn(main, 'run')
+// The module being tested should be imported dynamically. This ensures that the
+// mocks are used in place of any actual dependencies.
+const { run } = await import('../src/main.js')
 
-// Other utilities
-const timeRegex = /^\d{2}:\d{2}:\d{2}/
-
-describe('action', () => {
+describe('main.js', () => {
   beforeEach(() => {
-    jest.clearAllMocks()
+    // Set the action's inputs as return values from core.getInput().
+    core.getInput.mockImplementation(() => '500')
+
+    // Mock the wait function so that it does not actually wait.
+    wait.mockImplementation(() => Promise.resolve('done!'))
   })
 
-  it('sets the time output', async () => {
-    // Set the action's inputs as return values from core.getInput()
-    getInputMock.mockImplementation(name => {
-      switch (name) {
-        case 'milliseconds':
-          return '500'
-        default:
-          return ''
-      }
-    })
+  afterEach(() => {
+    jest.resetAllMocks()
+  })
 
-    await main.run()
-    expect(runMock).toHaveReturned()
+  it('Sets the time output', async () => {
+    await run()
 
-    // Verify that all of the core library functions were called correctly
-    expect(debugMock).toHaveBeenNthCalledWith(1, 'Waiting 500 milliseconds ...')
-    expect(debugMock).toHaveBeenNthCalledWith(
-      2,
-      expect.stringMatching(timeRegex)
-    )
-    expect(debugMock).toHaveBeenNthCalledWith(
-      3,
-      expect.stringMatching(timeRegex)
-    )
-    expect(setOutputMock).toHaveBeenNthCalledWith(
+    // Verify the time output was set.
+    expect(core.setOutput).toHaveBeenNthCalledWith(
       1,
       'time',
-      expect.stringMatching(timeRegex)
+      // Simple regex to match a time string in the format HH:MM:SS.
+      expect.stringMatching(/^\d{2}:\d{2}:\d{2}/)
     )
   })
 
-  it('sets a failed status', async () => {
-    // Set the action's inputs as return values from core.getInput()
-    getInputMock.mockImplementation(name => {
-      switch (name) {
-        case 'milliseconds':
-          return 'this is not a number'
-        default:
-          return ''
-      }
-    })
+  it('Sets a failed status', async () => {
+    // Clear the getInput mock and return an invalid value.
+    core.getInput.mockClear().mockReturnValueOnce('this is not a number')
 
-    await main.run()
-    expect(runMock).toHaveReturned()
+    // Clear the wait mock and return a rejected promise.
+    wait
+      .mockClear()
+      .mockRejectedValueOnce(new Error('milliseconds is not a number'))
 
-    // Verify that all of the core library functions were called correctly
-    expect(setFailedMock).toHaveBeenNthCalledWith(
+    await run()
+
+    // Verify that the action was marked as failed.
+    expect(core.setFailed).toHaveBeenNthCalledWith(
       1,
-      'milliseconds not a number'
-    )
-  })
-
-  it('fails if no input is provided', async () => {
-    // Set the action's inputs as return values from core.getInput()
-    getInputMock.mockImplementation(name => {
-      switch (name) {
-        case 'milliseconds':
-          throw new Error('Input required and not supplied: milliseconds')
-        default:
-          return ''
-      }
-    })
-
-    await main.run()
-    expect(runMock).toHaveReturned()
-
-    // Verify that all of the core library functions were called correctly
-    expect(setFailedMock).toHaveBeenNthCalledWith(
-      1,
-      'Input required and not supplied: milliseconds'
+      'milliseconds is not a number'
     )
   })
 })