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# frozen_string_literal: true
RSpec.describe GameOfLife::Cell do
subject(:living_cell) { described_class.new(x: nil, y: nil, alive: true) }
subject(:dead_cell) { described_class.new(x: nil, y: nil, alive: false) }
describe "#to_s" do
context "when alive" do
it "returns LIVE_CELL representation" do
stub_const("LIVE_CELL", "X")
expect(living_cell.to_s).to eq "X"
end
end
context "when dead" do
it "returns DEAD_CELL representation" do
stub_const("DEAD_CELL", ".")
expect(dead_cell.to_s).to eq "."
end
end
end
describe "#evolve!" do
it "calls #living_neighbors with param: neighbors" do
neighbors = [1, 2, 3, 4, 5]
expect(living_cell).to receive(:living_neighbors).with(neighbors)
living_cell.evolve!(neighbors)
end
context "when dead" do
it "stays dead" do
expect(dead_cell).to receive(:living_neighbors).with([]).and_return 0
next_generation = dead_cell.evolve!([])
expect(next_generation.object_id).to eq dead_cell.object_id
expect(next_generation.dead?).to be_truthy
end
it "becomes alive when having 3 living neighbors" do
expect(dead_cell).to receive(:living_neighbors).with([]).and_return 3
next_generation = dead_cell.evolve!([])
expect(next_generation.object_id).not_to eq dead_cell.object_id
expect(next_generation.alive?).to be_truthy
end
end
context "when alive" do
it "survives when having 2 neighbors" do
expect(living_cell).to receive(:living_neighbors).with([]).and_return 2
next_generation = living_cell.evolve!([])
expect(next_generation.object_id).to eq living_cell.object_id
expect(next_generation.alive?).to be_truthy
end
it "survives when having 3 neighbors" do
expect(living_cell).to receive(:living_neighbors).with([]).and_return 3
next_generation = living_cell.evolve!([])
expect(next_generation.object_id).to eq living_cell.object_id
expect(next_generation.alive?).to be_truthy
end
it "dies when having less than 2 neighbors" do
expect(living_cell).to receive(:living_neighbors).with([]).and_return 1
next_generation = living_cell.evolve!([])
expect(next_generation.object_id).not_to eq living_cell.object_id
expect(next_generation.dead?).to be_truthy
end
it "dies when having more than 3 neighbors" do
expect(living_cell).to receive(:living_neighbors).with([]).and_return 4
next_generation = living_cell.evolve!([])
expect(next_generation).not_to eq living_cell
expect(next_generation.dead?).to be_truthy
end
end
end
describe "#alive?" do
it { expect(living_cell.alive?).to be_truthy }
it { expect(dead_cell.alive?).to be_falsy }
end
describe "#dead?" do
it { expect(living_cell.dead?).to be_falsy }
it { expect(dead_cell.dead?).to be_truthy }
end
describe "#living_neighbors" do
subject(:cell) { [living_cell, dead_cell].sample }
let(:living_neighbors) { (0...rand(100)).map { described_class.new(x: nil, y: nil, alive: true) } }
let(:dead_neighbors) { (0...rand(100)).map { described_class.new(x: nil, y: nil, alive: false) } }
let(:neighbors) { (living_neighbors + dead_neighbors).shuffle }
it "returns the count of living neighbors cells" do
expect(cell.send(:living_neighbors, neighbors)).to eq living_neighbors.size
end
end
describe "#repopulate!" do
# evaluate subject to avoid multiple calls on first evaluation in the test
subject!(:cell) { [dead_cell, living_cell].sample }
it "returns living cell" do
expect(described_class).to receive(:new).with(hash_including(alive: true))
cell.send(:repopulate!)
end
end
describe "#survive!" do
subject(:cell) { [dead_cell, living_cell].sample }
it "returns self" do
expect(cell.send(:survive!).object_id).to eq cell.object_id
end
end
describe "#die!" do
context "when dead" do
subject(:cell) { dead_cell }
it "returns self" do
expect(cell.send(:die!).object_id).to eq cell.object_id
end
end
context "when alive" do
# evaluate subject to avoid multiple calls on first evaluation in the test
subject!(:cell) { living_cell }
it "returns new dead cell" do
expect(described_class).to receive(:new).with(hash_including(alive: false))
cell.send(:die!)
end
end
end
end
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