Reuse count for repeated tests

[tahirmt]

Currently if you have more than one expectation in a test and you run that test repeatedly the snapshots would get generated over and over with different identifier.

it("should look as expected) {
  expect(view1) == snapshot(as: .image)
  expect(view2) == snapshot(as: .image)
}

If you run the test above repeatedly you will see new images with 3-n index getting added. This causes a lot of problems for repeated tests and generates unnecessary snapshots.

Now, we will reuse the counter value for the same expectation on the same line for every repetition and this allows you to run tests repeatedly without issues.