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
|
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#fetch" do
it "returns the element at the passed index" do
[1, 2, 3].fetch(1).should == 2
[nil].fetch(0).should == nil
end
it "counts negative indices backwards from end" do
[1, 2, 3, 4].fetch(-1).should == 4
end
it "raises an IndexError if there is no element at index" do
-> { [1, 2, 3].fetch(3) }.should raise_error(IndexError)
-> { [1, 2, 3].fetch(-4) }.should raise_error(IndexError)
-> { [].fetch(0) }.should raise_error(IndexError)
end
it "returns default if there is no element at index if passed a default value" do
[1, 2, 3].fetch(5, :not_found).should == :not_found
[1, 2, 3].fetch(5, nil).should == nil
[1, 2, 3].fetch(-4, :not_found).should == :not_found
[nil].fetch(0, :not_found).should == nil
end
it "returns the value of block if there is no element at index if passed a block" do
[1, 2, 3].fetch(9) { |i| i * i }.should == 81
[1, 2, 3].fetch(-9) { |i| i * i }.should == 81
end
it "passes the original index argument object to the block, not the converted Integer" do
o = mock('5')
def o.to_int(); 5; end
[1, 2, 3].fetch(o) { |i| i }.should equal(o)
end
it "gives precedence to the default block over the default argument" do
-> {
@result = [1, 2, 3].fetch(9, :foo) { |i| i * i }
}.should complain(/block supersedes default value argument/)
@result.should == 81
end
it "tries to convert the passed argument to an Integer using #to_int" do
obj = mock('to_int')
obj.should_receive(:to_int).and_return(2)
["a", "b", "c"].fetch(obj).should == "c"
end
it "raises a TypeError when the passed argument can't be coerced to Integer" do
-> { [].fetch("cat") }.should raise_error(TypeError)
end
end
|
