1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
# frozen_string_literal: true
# rubocop:disable RSpec/MultipleSubjects
# rubocop:disable RSpec/EmptyLineAfterSubject
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
# rubocop:disable RSpec/SubjectStub
# rubocop:disable RSpec/StubbedMock
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
allow(dead_cell).to receive(:living_neighbors).with([]).and_return 0
expect(dead_cell).to receive(:living_neighbors)
next_generation = dead_cell.evolve!([])
expect(next_generation.object_id).to eq dead_cell.object_id
expect(next_generation).to be_dead
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).to be_alive
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).to be_alive
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).to be_alive
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).to be_dead
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).to be_dead
end
end
end
# rubocop:enable RSpec/SubjectStub
# rubocop:enable RSpec/StubbedMock
describe "#alive?" do
it { expect(living_cell).to be_alive }
it { expect(dead_cell).not_to be_alive }
end
describe "#dead?" do
it { expect(living_cell).not_to be_dead }
it { expect(dead_cell).to be_dead }
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
# rubocop:enable RSpec/MultipleSubjects
# rubocop:enable RSpec/EmptyLineAfterSubject
|
