We present a tool for verification of correctness of the generated 2D Delaunay triangulation that has been developed as educational support for computational geometry course. The tool allows students to discover possible flaws in implemented triangulations such as unused points, missing edges, non-Delaunay triangles or degenerated triangles. The associated benchmark data sets provide common check points of implemented solutions. The tool and the benchmark data set also serve teachers for fair evaluation of students’ work.