Difficult to know exactly the regulation when you want to travel to Europe currently: each country seems to decide a series of separate and different rules to prevent the spread of Covid-19, without any discussion with their neighbours.
Let's have a look at some measures here and find a link to answer most questions per country in our article:
No unity on rules imposed in the EU to curb coronavirus

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Finally a common approach on travel restrictions!

On 13 October, EU countries have agreed on a coordinated approach to travel measures and developped common criteria for mapping risks.. The purpose is to maintain free movement within the Union, under safe conditions.

Read our article: EU: Finally a common approach on travel restrictions