Table for test.each cannot be loaded in beforeAll step

🐛 Bug Report

Tests don’t run if there is a test.each(table, fn) where table is a global state which is populated in beforeAll. But since jest analysis sees it as no tests it doesn’t run beforeAll either.

To Reproduce

const tableData = [];

beforeAll(() => {
   tableData.push([1]);  
});

test.each(tableData, ('%d', (num) => console.log(num)));

Expected behavior

Test should run for all elements loaded into the table after execution of beforeAll.

[LukasBombach]

For people finding this googling how to use jest.each with beforeAll ore beforeEach. You can still put those before your describe block:

let foo: string;
let bar: number;

beforeAll(async () => {
  foo = await asyncFunctionA();
  bar = await asyncFunctionB();
}, 10000);

afterAll(async () => {
  await tearDown();
});

describe("Characteristic", () => {
  it.each`
    foo    | bar    | whatever | returnValue
    ${foo} | ${bar} | ${1}     | ${2}
    ${foo} | ${bar} | ${2}     | ${4}
    ${foo} | ${bar} | ${3}     | ${6}
    ${foo} | ${bar} | ${4}     | ${8}
  `(
    "table works with $foo, $bar and $whatever",
    async ({ foo, bar, whatever, returnValue }) => {
      expect(yourFunction(foo, bar, whatever)).toBe(returnValue);
    }
  );
});

[SimenB]

We’re not gonna run any hooks before collecting tests, we don’t wanna “execute” a file multiple times.

jest-each should probably throw an explicit error if given an empty array