[jest-each] Feature: handle 1d array

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Features
 
+* `[jest-each]` Support one dimensional array of data ([#6351](https://github.com/facebook/jest/pull/6351))
 * `[jest-watch]` create new package `jest-watch` to ease custom watch plugin development ([#6318](https://github.com/facebook/jest/pull/6318))
 
 ### Fixes

e2e/__tests__/__snapshots__/each.test.js.snap

@@ -29,7 +29,7 @@ exports[`shows error message when not enough arguments are supplied to tests 1`]
 
     Missing 1 arguments
 
-      at packages/jest-each/build/bind.js:81:17
+      at packages/jest-each/build/bind.js:84:17
 
 "
 `;
@@ -68,6 +68,9 @@ exports[`shows the correct errors in stderr when failing tests 1`] = `
   ✓ template table fails on one row expected: true == true
   ✕ template table fails on all rows expected: 1 == 2
   ✕ template table fails on all rows expected: 3 == 4
+  ✕ The word red contains the letter 'z'
+  ✕ The word green contains the letter 'z'
+  ✕ The word bean contains the letter 'z'
   template table describe fails on all rows expected a == b
     ✕ fails
   template table describe fails on all rows expected c == d
@@ -247,5 +250,56 @@ exports[`shows the correct errors in stderr when failing tests 1`] = `
 
       at __tests__/failure.test.js:61:20
 
+  ● The word red contains the letter 'z'
+
+    expect(received).toBe(expected) // Object.is equality
+
+    Expected: true
+    Received: false
+
+      67 |   \\"The word %s contains the letter 'z'\\",
+      68 |   word => {
+    > 69 |     expect(/z/.test(word)).toBe(true);
+         |                            ^
+      70 |   }
+      71 | );
+      72 |
+
+      at __tests__/failure.test.js:69:28
+
+  ● The word green contains the letter 'z'
+
+    expect(received).toBe(expected) // Object.is equality
+
+    Expected: true
+    Received: false
+
+      67 |   \\"The word %s contains the letter 'z'\\",
+      68 |   word => {
+    > 69 |     expect(/z/.test(word)).toBe(true);
+         |                            ^
+      70 |   }
+      71 | );
+      72 |
+
+      at __tests__/failure.test.js:69:28
+
+  ● The word bean contains the letter 'z'
+
+    expect(received).toBe(expected) // Object.is equality
+
+    Expected: true
+    Received: false
+
+      67 |   \\"The word %s contains the letter 'z'\\",
+      68 |   word => {
+    > 69 |     expect(/z/.test(word)).toBe(true);
+         |                            ^
+      70 |   }
+      71 | );
+      72 |
+
+      at __tests__/failure.test.js:69:28
+
 "
 `;

e2e/each/__tests__/failure.test.js

@@ -62,3 +62,10 @@ describe.each([['a', 'b'], ['c', 'd']])(
     });
   }
 );
+
+test.each(['red', 'green', 'bean'])(
+  "The word %s contains the letter 'z'",
+  word => {
+    expect(/z/.test(word)).toBe(true);
+  }
+);

e2e/each/__tests__/success.test.js

@@ -5,6 +5,13 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+test.each(['red', 'green', 'bean'])(
+  "The word %s contains the letter 'e'",
+  word => {
+    expect(/e/.test(word)).toBe(true);
+  }
+);
+
 it.each([[true, true], [true, true]])(
   'passes one row expected %s == %s',
   (left, right) => {

packages/jest-each/src/__tests__/array.test.js

@@ -93,7 +93,25 @@ describe('jest-each', () => {
         );
       });
 
-      test('calls global with cb function containing all parameters of each test case', () => {
+      test('calls global with cb function containing all parameters of each test case when given 1d array', () => {
+        const globalTestMocks = getGlobalTestMocks();
+        const testCallBack = jest.fn();
+        const eachObject = each.withGlobal(globalTestMocks)(['hello', 'world']);
+        const testFunction = get(eachObject, keyPath);
+        testFunction('expected string', testCallBack);
+
+        const globalMock = get(globalTestMocks, keyPath);
+
+        globalMock.mock.calls[0][1]();
+        expect(testCallBack).toHaveBeenCalledTimes(1);
+        expect(testCallBack).toHaveBeenCalledWith('hello');
+
+        globalMock.mock.calls[1][1]();
+        expect(testCallBack).toHaveBeenCalledTimes(2);
+        expect(testCallBack).toHaveBeenCalledWith('world');
+      });
+
+      test('calls global with cb function containing all parameters of each test case 2d array', () => {
         const globalTestMocks = getGlobalTestMocks();
         const testCallBack = jest.fn();
         const eachObject = each.withGlobal(globalTestMocks)([

packages/jest-each/src/bind.js

@@ -21,7 +21,10 @@ export default (cb: Function) => (...args: any) => (
   test: Function,
 ): void => {
   if (args.length === 1) {
-    const table: Table = args[0];
+    const table: Table = args[0].every(Array.isArray)
+      ? args[0]
+      : args[0].map(entry => [entry]);
+
     return table.forEach(row =>
       cb(util.format(title, ...row), applyRestParams(row, test)),
     );