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
|
require 'spec_helper'
require 'enumerable/statistics'
require 'delegate'
RSpec.describe Enumerable do
describe '#sum' do
subject(:sum) { enum.sum(init, &block) }
let(:init) { 0 }
let(:block) { nil }
with_enum 1..0 do
it_is_int_equal(0)
with_init(0.0) do
it_is_float_equal(0.0)
end
context 'with a conversion block' do
it 'does not call the conversion block' do
expect { |b|
enum.sum(&b)
}.not_to yield_control
end
end
end
with_enum 3..3 do
it_is_int_equal(3)
with_init(0.0) do
it_is_float_equal(3.0)
end
end
with_enum 3..5 do
it_is_int_equal(12)
end
with_enum 1..2 do
with_init(10)do
it_is_int_equal(13)
with_conversion ->(v) { v * 2 }, 'v * 2' do
it_is_int_equal(16)
end
end
end
it 'calls a block for each item once' do
yielded = []
range = 1..3
expect(range.each.sum {|x| yielded << x; x * 2 }).to eq(12)
expect(yielded).to eq(range.to_a)
end
with_enum :a..:b do
specify do
expect { subject }.to raise_error(TypeError)
end
end
with_enum "a".."c" do
with_init("") do
it { is_expected.to eq("abc") }
end
end
end
describe '#mean' do
subject(:mean) { enum.mean(&block) }
let(:block) { nil }
with_enum 1..0 do
it_is_float_equal(0.0)
context 'with a conversion block' do
it_is_float_equal(0.0)
it 'does not call the block' do
expect { |b|
enum.mean(&b)
}.not_to yield_control
end
end
end
with_enum 3..3 do
it_is_float_equal(3.0)
with_conversion ->(v) { v * 2 }, 'v * 2' do
it_is_float_equal(6.0)
end
end
with_enum 3..5 do
it_is_float_equal(4.0)
with_conversion ->(v) { v * 2 }, 'v * 2' do
it_is_float_equal(8.0)
end
end
end
end
|
