Before clicking the "Edit phase" link, there's already a "Name" field
present in the page (the name of the budget).
With the rack driver, there's no problem since the `fill_in` action
waits until the page is loaded.
However, the test will be a flaky spec if we use a driver supporting
JavaScript, since clicking the "Edit phase" link will cause an AJAX
request and the `fill_in` action might be executed before the AJAX
request is finished.
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