@callstack/reassure-measure/lib/module/testing-library.js

Performance measurement library for React and React Native

import * as logger from '@callstack/reassure-logger';
import { config } from './config';
let RNTL;
try {
  // eslint-disable-next-line import/no-extraneous-dependencies
  RNTL = require('@testing-library/react-native');
} catch {
  // Do nothing
}
let RTL;
try {
  // eslint-disable-next-line import/no-extraneous-dependencies
  RTL = require('@testing-library/react');
} catch {
  // Do nothing
}
export function resolveTestingLibrary() {
  // Explicit testing library option
  if (config.testingLibrary) {
    if (config.testingLibrary === 'react-native') {
      if (!RNTL) {
        throw new Error(`Unable to import '@testing-library/react-native' dependency`);
      }
      logger.verbose(`Using '@testing-library/react-native' to render components`);
      return RNTL;
    }
    if (config.testingLibrary === 'react') {
      if (!RTL) {
        throw new Error(`Unable to import '@testing-library/react' dependency`);
      }
      logger.verbose(`Using '@testing-library/react' to render components`);
      return RTL;
    }
    if (typeof config.testingLibrary === 'object' && typeof config.testingLibrary.render === 'function' && typeof config.testingLibrary.cleanup === 'function') {
      logger.verbose(`Using custom 'render' and 'cleanup' functions to render components`);
      return config.testingLibrary;
    }
    throw new Error(`Unsupported 'testingLibrary' value. Please set 'testingLibrary' to one of following values: 'react-native', 'react' or { render, cleanup }.`);
  }

  // Testing library auto-detection
  if (RNTL != null && RTL != null) {
    logger.warn("Both '@testing-library/react-native' and '@testing-library/react' are installed. Using '@testing-library/react-native' by default.\n\nYou can resolve this warning by explicitly calling 'configure({ testingLibrary: 'react-native' })' or 'configure({ testingLibrary: 'react' })' in your test setup file.");
    return RNTL;
  }
  if (RNTL != null) {
    logger.verbose(`Using '@testing-library/react-native' to render components`);
    return RNTL;
  }
  if (RTL != null) {
    logger.verbose(`Using '@testing-library/react' to render components`);
    return RTL;
  }
  throw new Error(`Unable to import neither '@testing-library/react-native' nor '@testing-library/react'.` + `\nAdd either of these testing libraries to your 'package.json'`);
}
export function getTestingLibrary() {
  if (typeof config.testingLibrary === 'string') {
    return config.testingLibrary;
  }
  if (RNTL != null) {
    return 'react-native';
  }
  if (RTL != null) {
    return 'react';
  }
  return null;
}
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