Attempting to simulate the behavior of nfcManager by utilizing the nfcManager.start() function in react native testing library

In the process of developing my Android app, I encountered a need to read NFC tags. To accomplish this task, I decided to utilize the react-native-nfc-manager library. However, during my implementation, I faced two perplexing issues that have left me stumped.

  • Firstly, what is the actual functionality of the nfcManager.start() function? Strangely, even when I removed it from the top of the method, my app seemed to still work fine. Upon further investigation, any attempts to check the promise's return value only resulted in undefined.
  • Secondly, in an effort to test the page, I attempted to mock the nfcManager. However, I consistently ran into errors such as 
    TypeError: _reactNativeNfcManager.default.start is not a function
    or 
    TypeError: _reactNativeNfcManager.default.isSupported is not a function
    , among others, for all interface functions.

To replicate these errors and perform testing, I employed the following code:

const mockNfcManager = jest.fn();

jest.mock("react-native-nfc-manager", ()=>({  NfcManagerModule: { start: mockNfcManager, }, }));

Following this setup, I proceeded to render the component and verify if 

expect(mockedNavigate).toHaveBeenCalled()
.

javascripttypescriptreact-nativereact-native-nfc-manager

Answer №1

ndefReader
  .init({
    onSessionEndedIOS: () => {},
  })
  .then(data => {})
  .catch(error => {
    console.log('This device does not have NFC capabilities.');
  });

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