testing-library / testing-library/user-event

userEvent.type does not work when setState uses previous value in assignment

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bug environment:react needs investigation
Dominant language
TypeScript
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Description

Reproduction example

https://codesandbox.io/s/mystifying-jones-xpe3p2?file=/src/App.test.js:63-90

Prerequisites
import { render, screen } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { useState } from "react";

const Test = () => {
  const [state, setState] = useState({ name: "" });

  return (
    <input
      onChange={(e) => {
        setState((last) => ({ ...last, name: e.target.value }));
      }}
      value={state.name}
    />
  );
};

describe("MyInput", () => {
  it("should update input", async () => {
    const user = userEvent.setup();

    render(<Test />);

    const simpleNameTextBox = screen.getByRole<HTMLInputElement>("textbox");

    await user.type(simpleNameTextBox, "test");
    expect(simpleNameTextBox).toHaveValue("test");
  });
});

Expected behavior

I expected the test to pass and the input being updated with "test".

Actual behavior

Output:

Expected the element to have value:
      test
Received:
      t
User-event version

14.4.3

Environment

Testing Library framework:
"@testing-library/react": "12.1.5",

JS framework:
"react": "17.0.2"

Test environment:
"jest": "29.4.1"

DOM implementation:
"jsdom": "20.0.0"

Additional context

I'm not sure how to configure sandbox to work so my repository example is broken but this should be enough info.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the reproduction in the linked CodeSandbox, especially src/App.test.js lines 63-90, and compare the userEvent.type call with the React state update using the previous value. Reproduce the received value of "t" under the listed React, @testing-library/react, Jest, and jsdom versions. Done means the supplied test reliably reaches the expected value of "test".

Written by the indexing model from the issue text.

Assessment

Tech stack
react, typescript
Domain
frontend, testing-qa
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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