The €1bn (£783m; $1.1bn) ship is being built for the Royal Caribbean International (RCI) cruise company.
The 120,000-tonne vessel is expected to be delivered to the US-based firm in two months.The trial will continue until Sunday.

The 16-deck Harmony of the Seas is 362m long - 50m longer than the Eiffel Tower is high.
After completion, it will be able to accommodate more than 6,000 passengers. About 2,000 crew members will cater for their needs.
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