The invention relates to a method of manufacturing an assembly (28) consisting of at least: - a test piece (18) with a longitudinal axis comprising a first (20) and a second (22) gripping parts connected to one another. to the other by a strand (24) having a cross section of smaller dimension relative to the first part (20) and to the second part (22), - a protective casing (30) internally delimiting a housing (32) of reception of at least one specimen (18), said at least one specimen (18) being arranged inside the protective box (30) and being connected to an internal face of the box (30) at the level of the first part (20) by a first branch (42) and at the level of the second part (22) by a second branch (44), the method comprising the following steps: a) providing at least one manufacturing support (48) of said assembly ( 28); b) Obtain said assembly (28) by manufacturing at least one specimen (18), at least one protective casing (30) and said at least two connection branches (42, 44), in one piece by additive manufacturing fusion on said manufacturing medium (48). Figure to be published with the abstract: Figure 4
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