[jest-each] Relaxed the validation to allow multibyte characters in headings

[hnisiji]

Summary

I fixed to be able to use Japanese and multibyte strings in the headings of jest.each as in Jest 26.

Since the release of Jest 27.0.0, Japanese headings are no longer available in jest-each.
The test case is as follows:

describe('jest.each & 日本語ヘッドライン', () => {
    test.each`
         入力 | 結果 
         ${1} | ${1}
         ${2} | ${4}
    `('2乗される', ({ 入力: input, 結果: expected }) => {
        expect(input**2).toEqual(expected);
     });
})

The output is follows:

> [email protected] test /Users/hnisiji/Documents/dev/jest-error
> jest

 FAIL  ./jest-each-with-japanese.spec.ts
  jest.each & 日本語ヘッドライン
    ✕ 2乗される (2 ms)

  ● jest.each & 日本語ヘッドライン › 2乗される

    Table headings do not conform to expected format:

    heading1 | headingN

    Received:

    "
             入力 | 結果 
             "

      1 | describe('jest.each & 日本語ヘッドライン', () => {
    > 2 |     test.each`
        |     ^
      3 |          入力 | 結果 
      4 |          ${1} | ${1}
      5 |          ${2} | ${4}

      at jest-each-with-japanese.spec.ts:2:5
      at Object.<anonymous> (jest-each-with-japanese.spec.ts:1:41)

I use Japanese in jest.each a lot, and I think that makes the test cases easier to understand.

Test plan

This PR works fine the test case above:

% cat jest-each-with-japanese.spec.ts 
describe('jest.each & 日本語ヘッドライン', () => {
    test.each`
         入力 | 結果 
         ${1} | ${1}
         ${2} | ${4}
    `('2乗される', ({ 入力: input, 結果: expected }) => {
        expect(input**2).toEqual(expected);
     });
})
[2021-06-15 23:25:06 hnisiji@hello:~/Documents/dev/jest-sample]
% ../jest/jest                       
yarn node v1.22.10
 PASS  ./jest-each-with-japanese.spec.ts
  jest.each & 日本語ヘッドライン
    ✓ 2乗される (2 ms)
    ✓ 2乗される

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |       0 |        0 |       0 |       0 |                   
----------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        0.418 s, estimated 1 s
Ran all test suites.
✨  Done in 2.76s.

[hnisiji]

@SimenB
Would you review this PR?
This issue is preventing me from updating to Jest 27...

[SimenB]

thanks!

Could you add a test and a changelog entry? 🙂

[codecov-commenter]

Codecov Report

Merging #11575 (061c053) into master (84b3b03) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #11575      +/-   ##
==========================================
- Coverage   69.01%   69.00%   -0.01%     
==========================================
  Files         312      312              
  Lines       16339    16339              
  Branches     4736     4736              
==========================================
- Hits        11276    11275       -1     
- Misses       5035     5036       +1     
  Partials       28       28              

Impacted Files	Coverage Δ
packages/jest-each/src/validation.ts	100.00% <100.00%> (ø)
packages/expect/src/utils.ts	95.58% <0.00%> (-0.56%)	⬇️

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[hnisiji]

@SimenB
Thank you for your review!

We've added a few test cases to simply check some of Unicode characters.
This may not be a good test, but I think it's enough.

[SimenB]

thanks!

[github-actions]

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