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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative '../../shared/hash/key_error'
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)
it "formats the object with #inspect in the KeyError message" do
-> {
{}.fetch('foo')
}.should raise_error(KeyError, 'key not found: "foo"')
end
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
-> {
@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
-> { {}.fetch() }.should raise_error(ArgumentError)
-> { {}.fetch(1, 2, 3) }.should raise_error(ArgumentError)
end
end
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