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
|
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../../../shared/hash/key_error', __FILE__)
describe "Hash#fetch" do
context "when the key is not found" do
it_behaves_like :key_error, ->(obj, key) { obj.fetch(key) }, Hash.new(a: 5)
it_behaves_like :key_error, ->(obj, key) { obj.fetch(key) }, {}
it_behaves_like :key_error, ->(obj, key) { obj.fetch(key) }, Hash.new { 5 }
it_behaves_like :key_error, ->(obj, key) { obj.fetch(key) }, Hash.new(5)
end
it "returns the value for key" do
{ a: 1, b: -1 }.fetch(:b).should == -1
end
it "returns default if key is not found when passed a default" do
{}.fetch(:a, nil).should == nil
{}.fetch(:a, 'not here!').should == "not here!"
{ a: nil }.fetch(:a, 'not here!').should == nil
end
it "returns value of block if key is not found when passed a block" do
{}.fetch('a') { |k| k + '!' }.should == "a!"
end
it "gives precedence to the default block over the default argument when passed both" do
lambda {
@result = {}.fetch(9, :foo) { |i| i * i }
}.should complain(/block supersedes default value argument/)
@result.should == 81
end
it "raises an ArgumentError when not passed one or two arguments" do
lambda { {}.fetch() }.should raise_error(ArgumentError)
lambda { {}.fetch(1, 2, 3) }.should raise_error(ArgumentError)
end
end
|
