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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
require_relative '../spec_helper'
require_relative 'fixtures/yield'
# Note that these specs use blocks defined as { |*a| ... } to capture the
# arguments with which the block is invoked. This is slightly confusing
# because the outer Array is a consequence of |*a| but it is necessary to
# clearly distinguish some behaviors.
describe "The yield call" do
before :each do
@y = YieldSpecs::Yielder.new
end
describe "taking no arguments" do
it "raises a LocalJumpError when the method is not passed a block" do
-> { @y.z }.should raise_error(LocalJumpError)
end
it "ignores assignment to the explicit block argument and calls the passed block" do
@y.ze { 42 }.should == 42
end
it "does not pass a named block to the block being yielded to" do
@y.z() { |&block| block == nil }.should == true
end
end
describe "taking a single argument" do
describe "when no block is given" do
it "raises a LocalJumpError" do
-> { @y.s(1) }.should raise_error(LocalJumpError)
end
end
describe "yielding to a literal block" do
it "passes an empty Array when the argument is an empty Array" do
@y.s([]) { |*a| a }.should == [[]]
end
it "passes nil as a value" do
@y.s(nil) { |*a| a }.should == [nil]
end
it "passes a single value" do
@y.s(1) { |*a| a }.should == [1]
end
it "passes a single, multi-value Array" do
@y.s([1, 2, 3]) { |*a| a }.should == [[1, 2, 3]]
end
end
describe "yielding to a lambda" do
it "passes an empty Array when the argument is an empty Array" do
@y.s([], &-> *a { a }).should == [[]]
end
it "passes nil as a value" do
@y.s(nil, &-> *a { a }).should == [nil]
end
it "passes a single value" do
@y.s(1, &-> *a { a }).should == [1]
end
it "passes a single, multi-value Array" do
@y.s([1, 2, 3], &-> *a { a }).should == [[1, 2, 3]]
end
it "raises an ArgumentError if too few arguments are passed" do
-> {
@y.s(1, &-> a, b { [a,b] })
}.should raise_error(ArgumentError)
end
it "should not destructure an Array into multiple arguments" do
-> {
@y.s([1, 2], &-> a, b { [a,b] })
}.should raise_error(ArgumentError)
end
end
end
describe "taking multiple arguments" do
it "raises a LocalJumpError when the method is not passed a block" do
-> { @y.m(1, 2, 3) }.should raise_error(LocalJumpError)
end
it "passes the arguments to the block" do
@y.m(1, 2, 3) { |*a| a }.should == [1, 2, 3]
end
it "passes only the first argument if the block takes one parameter" do
@y.m(1, 2, 3) { |a| a }.should == 1
end
it "raises an ArgumentError if too many arguments are passed to a lambda" do
-> {
@y.m(1, 2, 3, &-> a { })
}.should raise_error(ArgumentError)
end
it "raises an ArgumentError if too few arguments are passed to a lambda" do
-> {
@y.m(1, 2, 3, &-> a, b, c, d { })
}.should raise_error(ArgumentError)
end
end
describe "taking a single splatted argument" do
it "raises a LocalJumpError when the method is not passed a block" do
-> { @y.r(0) }.should raise_error(LocalJumpError)
end
it "passes a single value" do
@y.r(1) { |*a| a }.should == [1]
end
it "passes no arguments when the argument is an empty Array" do
@y.r([]) { |*a| a }.should == []
end
it "passes the value when the argument is an Array containing a single value" do
@y.r([1]) { |*a| a }.should == [1]
end
it "passes the values of the Array as individual arguments" do
@y.r([1, 2, 3]) { |*a| a }.should == [1, 2, 3]
end
it "passes the element of a single element Array" do
@y.r([[1, 2]]) { |*a| a }.should == [[1, 2]]
@y.r([nil]) { |*a| a }.should == [nil]
@y.r([[]]) { |*a| a }.should == [[]]
end
it "passes no values when give nil as an argument" do
@y.r(nil) { |*a| a }.should == []
end
end
describe "taking multiple arguments with a splat" do
it "raises a LocalJumpError when the method is not passed a block" do
-> { @y.rs(1, 2, [3, 4]) }.should raise_error(LocalJumpError)
end
it "passes the arguments to the block" do
@y.rs(1, 2, 3) { |*a| a }.should == [1, 2, 3]
end
it "does not pass an argument value if the splatted argument is an empty Array" do
@y.rs(1, 2, []) { |*a| a }.should == [1, 2]
end
it "passes the Array elements as arguments if the splatted argument is a non-empty Array" do
@y.rs(1, 2, [3]) { |*a| a }.should == [1, 2, 3]
@y.rs(1, 2, [nil]) { |*a| a }.should == [1, 2, nil]
@y.rs(1, 2, [[]]) { |*a| a }.should == [1, 2, []]
@y.rs(1, 2, [3, 4, 5]) { |*a| a }.should == [1, 2, 3, 4, 5]
end
it "does not pass an argument value if the splatted argument is nil" do
@y.rs(1, 2, nil) { |*a| a }.should == [1, 2]
end
end
describe "taking matching arguments with splats and post args" do
it "raises a LocalJumpError when the method is not passed a block" do
-> { @y.rs(1, 2, [3, 4]) }.should raise_error(LocalJumpError)
end
it "passes the arguments to the block" do
@y.rs([1, 2], 3, 4) { |(*a, b), c, d| [a, b, c, d] }.should == [[1], 2, 3, 4]
end
end
describe "taking a splat and a keyword argument" do
it "passes it as an array of the values and a hash" do
@y.k([1, 2]) { |*a| a }.should == [1, 2, {:b=>true}]
end
end
it "uses captured block of a block used in define_method" do
@y.deep(2).should == 4
end
end
describe "Using yield in a singleton class literal" do
it 'raises a SyntaxError' do
code = <<~RUBY
class << Object.new
yield
end
RUBY
-> { eval(code) }.should raise_error(SyntaxError, /Invalid yield/)
end
end
describe "Using yield in non-lambda block" do
it 'raises a SyntaxError' do
code = <<~RUBY
1.times { yield }
RUBY
-> { eval(code) }.should raise_error(SyntaxError, /Invalid yield/)
end
end
|
