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REFERENCE
Test.only Method
Specifies that TestCafe should skip all other tests and run only this test.
test.only → this
You can also use the fixture.only method to run individual fixtures separately.
If several tests or fixtures are marked with only, all the marked tests and fixtures are run.
fixture.only `Fixture 1`;
test('Fixture 1 - Test 1', () => {});
test('Fixture 1 - Test 2', () => {});
fixture `Fixture 2`;
test('Fixture 2 - Test 1', () => {});
test.only('Fixture 2 - Test 2', () => {});
test('Fixture 2 - Test 3', () => {});
// Only tests in 'Fixture 1' and the 'Fixture 2 - Test 2' test are run