Meer in het bijzonder moet de aangezochte rechter in limine litis nagaan of het forumkeuzebeding daadwerkelijk het voorwerp is geweest van wilsovereenstemming tussen partijen, die duidelijk en nauwkeurig tot uiting moet komen, waarbij de vormvereisten van artikel 25, lid 1, van verordening nr. 1215/2012 er in dat verband toe strekken te waarborgen dat de wilsovereenstemming inderdaad vaststaat (zie in die zin arrest van 28 juni 2017, Leventis en Vafeias, C‑436/16, EU:C:2017:497, punt 34 en aldaar aangehaalde rechtspraak).
More specifically, the court before which the matter is brought has the duty of examining, in limine litis, whether the jurisdiction clause was in fact the subject of consensus between the parties, which must be clearly and precisely demonstrated, the purpose of the requirements as to form imposed by Article 25(1) of Regulation No 1215/2012 being, in that regard, to ensure that consensus between the parties is in fact established (see, to that effect, judgment of 28 June 2017, Leventis and Vafeias, C‑436/16, EU:C:2017:497, paragraph 34 and the case-law cited).