Run a test only if meets a condition

[mbougarne]

🚀 Feature Proposal

Currently, if we want to run a test based on a condition we do it classically, we use if statement inside the body of the test/it function. This proposal suggests that we can add new functionality such as the only/skip ones, thus run the test if meets a condition: test.onlyIf(condition = true, 'Run it only if true')

Example

This proposal suggests that:

// Instead of this code
it('Should be true if age is larger than 18', () => {
  if(age > 18)
    {
      expect(true).toBeTruthy();
    }
});
// We can use this:
test.onlyIf(age > 18, 'Should run if age is larger than 18', () => {
  expect(true).toBeTruthy();
});

Actually, it will be useful when we try to check if a file exists to run tests against it.

[ahnpnl]

I believe duplicated with #7245

[mbougarne]

@ahnpnl I think it isn't, that's about skipping a test if a condition is true, but here I suggest running a test if meets a condition without using if statement inside test function it()/test().

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