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
|
assert('Object#instance_exec') do
class KlassWithSecret
def initialize
@secret = 99
end
end
k = KlassWithSecret.new
assert_equal 104, k.instance_exec(5) {|x| @secret+x }
end
assert('Object#tap') do
ret = []
(1..10) .tap {|x| ret << "original: #{x.inspect}"}
.to_a .tap {|x| ret << "array: #{x.inspect}"}
.select {|x| x%2==0} .tap {|x| ret << "evens: #{x.inspect}"}
.map { |x| x*x } .tap {|x| ret << "squares: #{x.inspect}"}
assert_equal [
"original: 1..10",
"array: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]",
"evens: [2, 4, 6, 8, 10]",
"squares: [4, 16, 36, 64, 100]"
], ret
assert_equal(:tap_ok, Class.new {def m; tap{return :tap_ok}; end}.new.m)
end
assert('instance_exec on primitives with class and module definition') do
begin
class A
1.instance_exec do
class B
end
end
end
assert_kind_of Class, A::B
ensure
Object.__send__(:remove_const,:A)
end
begin
class A
1.instance_exec do
module B
end
end
end
assert_kind_of Module, A::B
ensure
Object.__send__(:remove_const,:A)
end
end
assert('argument forwarding via instance_exec') do
assert_equal [[], {}, nil], instance_exec { |*args, **kw, &blk| [args, kw, blk] }
assert_equal [[1, 2, 3], {}, nil], instance_exec(1, 2, 3) { |*args, **kw, &blk| [args, kw, blk] }
assert_equal [[], { a: 1 }, nil], instance_exec(a: 1) { |*args, **kw, &blk| [args, kw, blk] }
end
assert('argument forwarding via instance_exec from c') do
assert_equal [[], {}, nil], instance_exec_from_c { |*args, **kw, &blk| [args, kw, blk] }
assert_equal [[1, 2, 3], {}, nil], instance_exec_from_c(1, 2, 3) { |*args, **kw, &blk| [args, kw, blk] }
# currently there is no easy way to call a method from C passing keyword arguments
#assert_equal [[], { a: 1 }, nil], instance_exec_from_c(a: 1) { |*args, **kw, &blk| [args, kw, blk] }
end
|
