Support shallow arrays in jest-each

I expected I could write this:

test.each(['red', 'green', 'bean'])("The word %s contains the letter 'e'", word => {
  expect(/e/.test(word)).toBe(true);
});

But it lead to very confusing test titles and test failures:

I ended up doing something like this, and it worked.

test.each(['red', 'green', 'bean'].map(word => [word]))(
  "The word %s contains the letter 'e'",
  word => {
    expect(/e/.test(word)).toBe(true);
  },
);

At the very least, it would be nice to error if the values in the table are not arrays.

@mattphillips

[captbaritone]

I think option two is best, since I would imagine it’s pretty common to want to make the same assertion about an array of values, and having to manually convert the array to a table is kinda gross.

[github-actions[bot]]

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