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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Hash#fetch" do
it "returns the value for key" do
{ a: 1, b: -1 }.fetch(:b).should == -1
end
it "raises a KeyError if key is not found" do
lambda { {}.fetch(:a) }.should raise_error(KeyError)
lambda { Hash.new(5).fetch(:a) }.should raise_error(KeyError)
lambda { Hash.new { 5 }.fetch(:a) }.should raise_error(KeyError)
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
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