graphics(
    line(x-2, (x, 0, 10), only_integers=True, steps="pre", label="pre"),
    line(x, (x, 0, 10), only_integers=True, steps="mid", label="mid"),
    line(x+2, (x, 0, 10), only_integers=True, steps="post", label="post"),
)
# Expected:
## Plot object containing:
## [0]: cartesian line: x - 2 for x over (0.0, 10.0)
## [1]: cartesian line: x for x over (0.0, 10.0)
## [2]: cartesian line: x + 2 for x over (0.0, 10.0)