AoC18/test/day3_test.exs

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defmodule Day3Test do
use ExUnit.Case
doctest Day3
alias Day3.Rect
test "rect overlap" do
a = %Rect{id: 1, left: 1, top: 3, width: 4, height: 4}
b = %Rect{id: 2, left: 3, top: 1, width: 4, height: 4}
assert Rect.overlap(a, b) == %Rect{id: nil, left: 3, top: 3, width: 2, height: 2}
a = %Rect{id: 1, left: 0, top: 0, width: 4, height: 4}
b = %Rect{id: 2, left: 4, top: 2, width: 4, height: 4}
assert Rect.overlap(a, b) == nil
end
test "parse rectangle from string" do
assert Day3.parse_rect("#1 @ 1,3: 4x4") == %Rect{id: 1, left: 1, top: 3, width: 4, height: 4}
assert Day3.parse_rect("#2 @ 3,1: 4x4") == %Rect{id: 2, left: 3, top: 1, width: 4, height: 4}
assert Day3.parse_rect("#3 @ 5,5: 2x2") == %Rect{id: 3, left: 5, top: 5, width: 2, height: 2}
end
test "overlap area" do
rects = [
%Rect{id: 1, left: 1, top: 3, width: 4, height: 4},
%Rect{id: 2, left: 3, top: 1, width: 4, height: 4},
%Rect{id: 3, left: 5, top: 5, width: 2, height: 2}
]
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assert Day3.overlap_area(rects) == 4
end
test "exclude overlapping" do
rects = [
%Rect{id: 1, left: 1, top: 3, width: 4, height: 4},
%Rect{id: 2, left: 3, top: 1, width: 4, height: 4},
%Rect{id: 3, left: 5, top: 5, width: 2, height: 2}
]
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res = Day3.exclude_overlapping(rects)
assert Enum.count(res) == 1
assert Enum.at(res, 0).id == 3
end
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end