def METHOD_NAME():
    # Construct a single triangle
    vertices = np.array([[0.5, 0, 0.5], [0, 0.5, 0.5], [0.5, 0.5, 0.5]])
    faces = np.array([[0, 1, 2]])
    mesh = triangular_mesh.TriangularMesh(vertices, faces)
    mesh.add_vertex(0)
    assert ((mesh.faces.shape == (3, 3)) and (mesh.vertices.shape == (4,3)))