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

CHANGELOG.md

@@ -7,6 +7,7 @@
 
 ### Fixes
 
+- `[jest-each]` Relaxed the validation to allow multibyte characters in headings ([#11575](https://github.com/facebook/jest/pull/11575))
 - `[jest-environment-jsdom]` Add support for `userAgent` option ([#11773](https://github.com/facebook/jest/pull/11773))
 - `[jest-environment-node]` Add `Event` and `EventTarget` to node global environment. ([#11705](https://github.com/facebook/jest/issues/11705))
 - `[jest-mock]` Fix `spyOn` to use `Object.prototype.hasOwnProperty` [#11721](https://github.com/facebook/jest/pull/11721)

packages/jest-each/src/__tests__/template.test.ts

@@ -70,6 +70,26 @@ describe('jest-each', () => {
         expect(testCallBack).not.toHaveBeenCalled();
       });
 
+      test('does not throw error when there are multibyte characters in first column headings', () => {
+        const globalTestMocks = getGlobalTestMocks();
+        const eachObject = each.withGlobal(globalTestMocks)`
+         ʅ(ツ)ʃ  | b    | expected
+          ${1}          | ${1} | ${2}
+        `;
+        const testFunction = get(eachObject, keyPath);
+        const testCallBack = jest.fn();
+        testFunction('accept multibyte characters', testCallBack);
+
+        const globalMock = get(globalTestMocks, keyPath);
+
+        expect(() => globalMock.mock.calls[0][1]()).not.toThrowError();
+        expect(testCallBack).toHaveBeenCalledWith({
+          b: 1,
+          expected: 2,
+          'ʅ(ツ)ʃ': 1,
+        });
+      });
+
       test('throws error when there are additional words in second column heading', () => {
         const globalTestMocks = getGlobalTestMocks();
         const eachObject = each.withGlobal(globalTestMocks)`
@@ -88,6 +108,26 @@ describe('jest-each', () => {
         expect(testCallBack).not.toHaveBeenCalled();
       });
 
+      test('does not throw error when there are multibyte characters in second column headings', () => {
+        const globalTestMocks = getGlobalTestMocks();
+        const eachObject = each.withGlobal(globalTestMocks)`
+          a    | ☝(ʕ⊙ḕ⊙ʔ)☝  | expected
+          ${1} | ${1}           | ${2}
+        `;
+        const testFunction = get(eachObject, keyPath);
+        const testCallBack = jest.fn();
+        testFunction('accept multibyte characters', testCallBack);
+
+        const globalMock = get(globalTestMocks, keyPath);
+
+        expect(() => globalMock.mock.calls[0][1]()).not.toThrowError();
+        expect(testCallBack).toHaveBeenCalledWith({
+          a: 1,
+          expected: 2,
+          '☝(ʕ⊙ḕ⊙ʔ)☝': 1,
+        });
+      });
+
       test('throws error when there are additional words in last column heading', () => {
         const globalTestMocks = getGlobalTestMocks();
         const eachObject = each.withGlobal(globalTestMocks)`
@@ -106,6 +146,26 @@ describe('jest-each', () => {
         expect(testCallBack).not.toHaveBeenCalled();
       });
 
+      test('does not throw error when there are multibyte characters in last column headings', () => {
+        const globalTestMocks = getGlobalTestMocks();
+        const eachObject = each.withGlobal(globalTestMocks)`
+          a    | b    | (๑ఠ‿ఠ๑)＜expected
+          ${1} | ${1} | ${2}
+        `;
+        const testFunction = get(eachObject, keyPath);
+        const testCallBack = jest.fn();
+        testFunction('accept multibyte characters', testCallBack);
+
+        const globalMock = get(globalTestMocks, keyPath);
+
+        expect(() => globalMock.mock.calls[0][1]()).not.toThrowError();
+        expect(testCallBack).toHaveBeenCalledWith({
+          '(๑ఠ‿ఠ๑)＜expected': 2,
+          a: 1,
+          b: 1,
+        });
+      });
+
       test('does not throw error when there is additional words in template after heading row', () => {
         const globalTestMocks = getGlobalTestMocks();
         const eachObject = each.withGlobal(globalTestMocks)`

packages/jest-each/src/validation.ts

@@ -77,7 +77,7 @@ const pluralize = (word: string, count: number) =>
 
 const START_OF_LINE = '^';
 const NEWLINE = '\\n';
-const HEADING = '\\s*\\w+\\s*';
+const HEADING = '\\s*[^\\s]+\\s*';
 const PIPE = '\\|';
 const REPEATABLE_HEADING = `(${PIPE}${HEADING})*`;
 const HEADINGS_FORMAT = new RegExp(