blob: d72384368868a4efb6868a65a32e5b46fb8fac61 (
plain)
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
|
require_relative '../spec_helper'
describe "The throw keyword" do
it "abandons processing" do
i = 0
catch(:done) do
loop do
i += 1
throw :done if i > 4
end
i += 1
end
i.should == 5
end
it "supports a second parameter" do
msg = catch(:exit) do
throw :exit,:msg
end
msg.should == :msg
end
it "uses nil as a default second parameter" do
msg = catch(:exit) do
throw :exit
end
msg.should == nil
end
it "clears the current exception" do
catch :exit do
begin
raise "exception"
rescue
throw :exit
end
end
$!.should be_nil
end
it "allows any object as its argument" do
catch(1) { throw 1, 2 }.should == 2
o = Object.new
catch(o) { throw o, o }.should == o
end
it "does not convert strings to a symbol" do
-> { catch(:exit) { throw "exit" } }.should raise_error(ArgumentError)
end
it "unwinds stack from within a method" do
def throw_method(handler, val)
throw handler, val
end
catch(:exit) do
throw_method(:exit, 5)
end.should == 5
end
it "unwinds stack from within a lambda" do
c = -> { throw :foo, :msg }
catch(:foo) { c.call }.should == :msg
end
it "raises an ArgumentError if outside of scope of a matching catch" do
-> { throw :test, 5 }.should raise_error(ArgumentError)
-> { catch(:different) { throw :test, 5 } }.should raise_error(ArgumentError)
end
it "raises an UncaughtThrowError if used to exit a thread" do
catch(:what) do
t = Thread.new {
-> {
throw :what
}.should raise_error(UncaughtThrowError)
}
t.join
end
end
end
|
