require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Hash#delete" do it "removes the entry and returns the deleted value" do h = { a: 5, b: 2 } h.delete(:b).should == 2 h.should == { a: 5 } end it "calls supplied block if the key is not found" do { a: 1, b: 10, c: 100 }.delete(:d) { 5 }.should == 5 Hash.new(:default).delete(:d) { 5 }.should == 5 Hash.new { :default }.delete(:d) { 5 }.should == 5 end it "returns nil if the key is not found when no block is given" do { a: 1, b: 10, c: 100 }.delete(:d).should == nil Hash.new(:default).delete(:d).should == nil Hash.new { :default }.delete(:d).should == nil end # MRI explicitly implements this behavior it "allows removing a key while iterating" do h = { a: 1, b: 2 } visited = [] h.each_pair { |k,v| visited << k h.delete(k) } visited.should == [:a, :b] h.should == {} end it "accepts keys with private #hash method" do key = HashSpecs::KeyWithPrivateHash.new { key => 5 }.delete(key).should == 5 end it "raises a FrozenError if called on a frozen instance" do -> { HashSpecs.frozen_hash.delete("foo") }.should raise_error(FrozenError) -> { HashSpecs.empty_frozen_hash.delete("foo") }.should raise_error(FrozenError) end end