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# frozen_string_literal: true
RSpec.describe GameOfLife::Universe do
describe ".new" do
it "creates a @current 2D array (Plane) of height * width" do
universe = described_class.new(width: 10, height: 1)
current_generation = universe.instance_variable_get(:@current)
expect(current_generation).to be_a GameOfLife::Plane
expect(current_generation[0]).to be_a GameOfLife::Plane
expect(current_generation.size).to eq 1
expect(current_generation[0].size).to eq 10
end
it "creates a @future 2D array (Plane) of height * width" do
universe = described_class.new(width: 10, height: 1)
future_generation = universe.instance_variable_get(:@future)
expect(future_generation).to be_a GameOfLife::Plane
expect(future_generation[0]).to be_a GameOfLife::Plane
expect(future_generation.size).to eq 1
expect(future_generation[0].size).to eq 10
end
end
describe "#to_s" do
subject(:universe) { described_class.new(width: 3, height: 3) }
before do
universe[0] = [1, 2, 3]
universe[1] = [4, 5, 6]
universe[2] = [7, 8, 9]
end
it "prints out the universe 2D @current array" do
expect(universe.to_s).to eq "123\n456\n789"
end
end
describe "#evolve!" do
subject(:universe) { described_class.new(width: 3, height: 3) }
before do
# quick way to initialize the whole universe with living cells
9.times { |i| universe[i / 3][i % 3] = GameOfLife::Cell.new(y: i / 3, x: i % 3, alive: true) }
end
it "calls Cell#evolve! on every cell" do
9.times { |i| expect(universe[i / 3][i % 3]).to receive(:evolve!) }
universe.evolve!
end
it "updates the universe current state" do
9.times { |i| expect(universe[i / 3][i % 3]).to be_alive }
universe.evolve!
9.times { |i| expect(universe[i / 3][i % 3]).to be_dead }
end
end
describe "#neighbors" do
subject(:universe) { described_class.new(width: 5, height: 5) }
it "returns surronding neighbors" do
current = GameOfLife::Plane.new(
[
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[. x x x .]),
GameOfLife::Plane.new(%w[. x C x .]),
GameOfLife::Plane.new(%w[. x x x .]),
GameOfLife::Plane.new(%w[. . . . .]),
],
)
universe.instance_variable_set(:@current, current)
cell = GameOfLife::Cell.new(y: 2, x: 2, alive: "C")
expect(universe.send(:neighbors, cell)).to eq %w[x x x x x x x x]
end
it "returns surronding neighbors (beyond top edge)" do
current = GameOfLife::Plane.new(
[
GameOfLife::Plane.new(%w[. x C x .]),
GameOfLife::Plane.new(%w[. x x x .]),
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[. x x x .]),
],
)
universe.instance_variable_set(:@current, current)
cell = GameOfLife::Cell.new(y: 0, x: 2, alive: "C")
expect(universe.send(:neighbors, cell)).to eq %w[x x x x x x x x]
end
it "returns surronding neighbors (beyond left edge)" do
current = GameOfLife::Plane.new(
[
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[x x . . x]),
GameOfLife::Plane.new(%w[C x . . x]),
GameOfLife::Plane.new(%w[x x . . x]),
],
)
universe.instance_variable_set(:@current, current)
cell = GameOfLife::Cell.new(y: 3, x: 0, alive: "C")
expect(universe.send(:neighbors, cell)).to eq %w[x x x x x x x x]
end
it "returns surronding neighbors (beyond diagonal edges)" do
current = GameOfLife::Plane.new(
[
GameOfLife::Plane.new(%w[C x . . x]),
GameOfLife::Plane.new(%w[x x . . x]),
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[x x . . x]),
],
)
universe.instance_variable_set(:@current, current)
cell = GameOfLife::Cell.new(y: 0, x: 0, alive: "C")
expect(universe.send(:neighbors, cell)).to eq %w[x x x x x x x x]
end
it "returns surronding neighbors (beyond reversed diagonal edges)" do
current = GameOfLife::Plane.new(
[
GameOfLife::Plane.new(%w[x . . x x]),
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[. . . . .]),
GameOfLife::Plane.new(%w[x . . x x]),
GameOfLife::Plane.new(%w[x . . x C]),
],
)
universe.instance_variable_set(:@current, current)
cell = GameOfLife::Cell.new(y: 4, x: 4, alive: "C")
expect(universe.send(:neighbors, cell)).to eq %w[x x x x x x x x]
end
end
end
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