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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
require 'spec_helper'
describe InternalId do
let(:project) { create(:project) }
let(:usage) { :issues }
let(:issue) { build(:issue, project: project) }
let(:scope) { { project: project } }
let(:init) { ->(s) { s.project.issues.size } }
it_behaves_like 'having unique enum values'
context 'validations' do
it { is_expected.to validate_presence_of(:usage) }
end
describe '.generate_next' do
subject { described_class.generate_next(issue, scope, usage, init) }
context 'in the absence of a record' do
it 'creates a record if not yet present' do
expect { subject }.to change { described_class.count }.from(0).to(1)
end
it 'stores record attributes' do
subject
described_class.first.tap do |record|
expect(record.project).to eq(project)
expect(record.usage).to eq(usage.to_s)
end
end
context 'with existing issues' do
before do
create_list(:issue, 2, project: project)
described_class.delete_all
end
it 'calculates last_value values automatically' do
expect(subject).to eq(project.issues.size + 1)
end
end
context 'with concurrent inserts on table' do
it 'looks up the record if it was created concurrently' do
args = { **scope, usage: described_class.usages[usage.to_s] }
record = double
expect(described_class).to receive(:find_by).with(args).and_return(nil) # first call, record not present
expect(described_class).to receive(:find_by).with(args).and_return(record) # second call, record was created by another process
expect(described_class).to receive(:create!).and_raise(ActiveRecord::RecordNotUnique, 'record not unique')
expect(record).to receive(:increment_and_save!)
subject
end
end
end
it 'generates a strictly monotone, gapless sequence' do
seq = Array.new(10).map do
described_class.generate_next(issue, scope, usage, init)
end
normalized = seq.map { |i| i - seq.min }
expect(normalized).to eq((0..seq.size - 1).to_a)
end
context 'with an insufficient schema version' do
before do
described_class.reset_column_information
# Project factory will also call the current_version
expect(ActiveRecord::Migrator).to receive(:current_version).twice.and_return(InternalId::REQUIRED_SCHEMA_VERSION - 1)
end
let(:init) { double('block') }
it 'calculates next internal ids on the fly' do
val = rand(1..100)
expect(init).to receive(:call).with(issue).and_return(val)
expect(subject).to eq(val + 1)
end
end
end
describe '.track_greatest' do
let(:value) { 9001 }
subject { described_class.track_greatest(issue, scope, usage, value, init) }
context 'in the absence of a record' do
it 'creates a record if not yet present' do
expect { subject }.to change { described_class.count }.from(0).to(1)
end
end
it 'stores record attributes' do
subject
described_class.first.tap do |record|
expect(record.project).to eq(project)
expect(record.usage).to eq(usage.to_s)
expect(record.last_value).to eq(value)
end
end
context 'with existing issues' do
before do
create(:issue, project: project)
described_class.delete_all
end
it 'still returns the last value to that of the given value' do
expect(subject).to eq(value)
end
end
context 'when value is less than the current last_value' do
it 'returns the current last_value' do
described_class.create!(**scope, usage: usage, last_value: 10_001)
expect(subject).to eq 10_001
end
end
end
describe '#increment_and_save!' do
let(:id) { create(:internal_id) }
subject { id.increment_and_save! }
it 'returns incremented iid' do
value = id.last_value
expect(subject).to eq(value + 1)
end
it 'saves the record' do
subject
expect(id.changed?).to be_falsey
end
context 'with last_value=nil' do
let(:id) { build(:internal_id, last_value: nil) }
it 'returns 1' do
expect(subject).to eq(1)
end
end
end
describe '#track_greatest_and_save!' do
let(:id) { create(:internal_id) }
let(:new_last_value) { 9001 }
subject { id.track_greatest_and_save!(new_last_value) }
it 'returns new last value' do
expect(subject).to eq new_last_value
end
it 'saves the record' do
subject
expect(id.changed?).to be_falsey
end
context 'when new last value is lower than the max' do
it 'does not update the last value' do
id.update!(last_value: 10_001)
subject
expect(id.reload.last_value).to eq 10_001
end
end
end
end
|