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Bug Reported Here

This repo shows a problem in the current version of ionic with testing. The problem is that if you do screen.debug() or any of the @testing-library matchers fail, it enters into an infinite loop and makes the test fail.

How to recreate:

  1. Create a new ionic project with

    ionic start myApp blank --type=react

  2. Add screen.debug() into the test of App.test.tsx

    import { render, screen } from "@testing-library/react";
import App from "./App";

test("renders without crashing", () => {
  const { baseElement } = render(<App />);
  screen.debug();
  expect(baseElement).toBeDefined();
});

  3. Run tests with npm test

Found result:

 FAIL  src/App.test.tsx (6.74 s)
  ✕ renders without crashing (6335 ms)

  ● renders without crashing

    RangeError: Invalid string length

      at printObjectProperties (node_modules/pretty-format/build/collections.js:174:47)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)
      at printComplexValue (node_modules/pretty-format/build/index.js:310:48)
      at printer (node_modules/pretty-format/build/index.js:393:10)
      at printObjectProperties (node_modules/pretty-format/build/collections.js:173:21)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        6.776 s
Ran all test suites related to changed files.

Watch Usage: Press w to show more.
✨  Done in 592.95s.

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