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
|
require 'test/unit'
class TestLambdaParameters < Test::Unit::TestCase
def test_exact_parameter
assert_raise(ArgumentError){(1..3).each(&lambda{})}
end
def test_call_simple
assert_equal(1, lambda{|a| a}.call(1))
assert_equal([1,2], lambda{|a, b| [a,b]}.call(1,2))
assert_raise(ArgumentError) { lambda{|a|}.call(1,2) }
assert_raise(ArgumentError) { lambda{|a|}.call() }
assert_raise(ArgumentError) { lambda{}.call(1) }
assert_raise(ArgumentError) { lambda{|a, b|}.call(1,2,3) }
assert_equal(1, ->(a){ a }.call(1))
assert_equal([1,2], ->(a,b){ [a,b] }.call(1,2))
assert_raise(ArgumentError) { ->(a){ }.call(1,2) }
assert_raise(ArgumentError) { ->(a){ }.call() }
assert_raise(ArgumentError) { ->(){ }.call(1) }
assert_raise(ArgumentError) { ->(a,b){ }.call(1,2,3) }
end
def test_lambda_as_iterator
a = 0
2.times(&->(_){ a += 1 })
assert_equal(a, 2)
assert_raise(ArgumentError) {1.times(&->(){ a += 1 })}
end
def test_call_rest_args
assert_equal([1,2], ->(*a){ a }.call(1,2))
assert_equal([1,2,[]], ->(a,b,*c){ [a,b,c] }.call(1,2))
assert_raise(ArgumentError){ ->(a,*b){ }.call() }
end
def test_call_opt_args
assert_equal([1,2,3,4], ->(a,b,c=3,d=4){ [a,b,c,d] }.call(1,2))
assert_equal([1,2,3,4], ->(a,b,c=0,d=4){ [a,b,c,d] }.call(1,2,3))
assert_raise(ArgumentError){ ->(a,b=1){ }.call() }
assert_raise(ArgumentError){ ->(a,b=1){ }.call(1,2,3) }
end
def test_call_rest_and_opt
assert_equal([1,2,3,[]], ->(a,b=2,c=3,*d){ [a,b,c,d] }.call(1))
assert_equal([1,2,3,[]], ->(a,b=0,c=3,*d){ [a,b,c,d] }.call(1,2))
assert_equal([1,2,3,[4,5,6]], ->(a,b=0,c=0,*d){ [a,b,c,d] }.call(1,2,3,4,5,6))
assert_raise(ArgumentError){ ->(a,b=1,*c){ }.call() }
end
def test_call_with_block
f = ->(a,b,c=3,*d,&e){ [a,b,c,d,e.call(d + [a,b,c])] }
assert_equal([1,2,3,[],6], f.call(1,2){|z| z.inject{|s,x| s+x} } )
assert_equal(nil, ->(&b){ b }.call)
foo { puts "bogus block " }
assert_equal(1, ->(&b){ b.call }.call { 1 })
b = nil
assert_equal(1, ->(&b){ b.call }.call { 1 })
assert_nil(b)
end
def foo
assert_equal(nil, ->(&b){ b }.call)
end
def test_in_basic_object
bug5966 = '[ruby-core:42349]'
called = false
BasicObject.new.instance_eval {->() {called = true}.()}
assert_equal(true, called, bug5966)
end
def test_location_on_error
bug6151 = '[ruby-core:43314]'
called = 0
line, f = __LINE__, lambda do
called += 1
true
end
e = assert_raise(ArgumentError) do
f.call(42)
end
assert_send([e.backtrace.first, :start_with?, "#{__FILE__}:#{line}:"], bug6151)
assert_equal(0, called)
e = assert_raise(ArgumentError) do
42.times(&f)
end
assert_send([e.backtrace.first, :start_with?, "#{__FILE__}:#{line}:"], bug6151)
assert_equal(0, called)
end
def return_in_current(val)
1.tap &->(*) {return 0}
val
end
def yield_block
yield
end
def return_in_callee(val)
yield_block &->(*) {return 0}
val
end
def test_return
feature8693 = '[ruby-core:56193] [Feature #8693]'
assert_equal(42, return_in_current(42), feature8693)
assert_equal(42, return_in_callee(42), feature8693)
end
def test_do_lambda_source_location
exp_lineno = __LINE__ + 3
lmd = ->(x,
y,
z) do
#
end
file, lineno = lmd.source_location
assert_match(/^#{ Regexp.quote(__FILE__) }$/, file)
assert_equal(exp_lineno, lineno, "must be at the beginning of the block")
end
def test_brace_lambda_source_location
exp_lineno = __LINE__ + 3
lmd = ->(x,
y,
z) {
#
}
file, lineno = lmd.source_location
assert_match(/^#{ Regexp.quote(__FILE__) }$/, file)
assert_equal(exp_lineno, lineno, "must be at the beginning of the block")
end
end
|
