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
|
require 'spec_helper'
describe Immutable::Hash do
describe '#[]=' do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }
it 'raises error pointing to #put' do
expect { hash[:A] = 'aye' }
.to raise_error(NoMethodError, /Immutable::Hash.*`put'/)
end
end
describe '#put' do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }
context 'with a block' do
it 'passes the value to the block' do
hash.put('A') { |value| value.should == 'aye' }
end
it 'replaces the value with the result of the block' do
result = hash.put('A') { |value| 'FLIBBLE' }
result.get('A').should == 'FLIBBLE'
end
it 'supports to_proc methods' do
result = hash.put('A', &:upcase)
result.get('A').should == 'AYE'
end
context 'if there is no existing association' do
it 'passes nil to the block' do
hash.put('D') { |value| value.should be_nil }
end
it 'stores the result of the block as the new value' do
result = hash.put('D') { |value| 'FLIBBLE' }
result.get('D').should == 'FLIBBLE'
end
end
end
context 'with a unique key' do
let(:result) { hash.put('D', 'dee') }
it 'preserves the original' do
result
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see'])
end
it 'returns a copy with the superset of key/value pairs' do
result.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see', 'D' => 'dee'])
end
end
context 'with a duplicate key' do
let(:result) { hash.put('C', 'sea') }
it 'preserves the original' do
result
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see'])
end
it 'returns a copy with the superset of key/value pairs' do
result.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'sea'])
end
end
context 'with duplicate key and identical value' do
let(:hash) { H['X' => 1, 'Y' => 2] }
let(:result) { hash.put('X', 1) }
it 'returns the original hash unmodified' do
result.should be(hash)
end
context 'with big hash (force nested tries)' do
let(:keys) { (0..99).map(&:to_s) }
let(:values) { (100..199).to_a }
let(:hash) { H[keys.zip(values)] }
it 'returns the original hash unmodified for all changes' do
keys.each_with_index do |key, index|
result = hash.put(key, values[index])
result.should be(hash)
end
end
end
end
context 'with unequal keys which hash to the same value' do
let(:hash) { H[DeterministicHash.new('a', 1) => 'aye'] }
it 'stores and can retrieve both' do
result = hash.put(DeterministicHash.new('b', 1), 'bee')
result.get(DeterministicHash.new('a', 1)).should eql('aye')
result.get(DeterministicHash.new('b', 1)).should eql('bee')
end
end
context 'when a String is inserted as key and then mutated' do
it 'is not affected' do
string = 'a string!'
hash = H.empty.put(string, 'a value!')
string.upcase!
hash['a string!'].should == 'a value!'
hash['A STRING!'].should be_nil
end
end
end
end
|
