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require_relative '../../../spec_helper'
require_relative 'fixtures/classes'
ruby_version_is "3.3" do
describe "ObjectSpace::WeakKeyMap#[]" do
it "is faithful to the map's content" do
map = ObjectSpace::WeakKeyMap.new
key1, key2 = %w[a b].map(&:upcase)
ref1, ref2 = %w[x y]
map[key1] = ref1
map[key1].should == ref1
map[key1] = ref1
map[key1].should == ref1
map[key2] = ref2
map[key1].should == ref1
map[key2].should == ref2
end
it "compares keys with #eql? semantics" do
map = ObjectSpace::WeakKeyMap.new
key = [1.0]
map[key] = "x"
map[[1]].should == nil
map[[1.0]].should == "x"
key.should == [1.0] # keep the key alive until here to keep the map entry
map = ObjectSpace::WeakKeyMap.new
key = [1]
map[key] = "x"
map[[1.0]].should == nil
map[[1]].should == "x"
key.should == [1] # keep the key alive until here to keep the map entry
map = ObjectSpace::WeakKeyMap.new
key1, key2 = %w[a a].map(&:upcase)
ref = "x"
map[key1] = ref
map[key2].should == ref
end
it "compares key via #hash first" do
x = mock('0')
x.should_receive(:hash).and_return(0)
map = ObjectSpace::WeakKeyMap.new
key = 'foo'
map[key] = :bar
map[x].should == nil
end
it "does not compare keys with different #hash values via #eql?" do
x = mock('x')
x.should_not_receive(:eql?)
x.stub!(:hash).and_return(0)
y = mock('y')
y.should_not_receive(:eql?)
y.stub!(:hash).and_return(1)
map = ObjectSpace::WeakKeyMap.new
map[y] = 1
map[x].should == nil
end
it "compares keys with the same #hash value via #eql?" do
x = mock('x')
x.should_receive(:eql?).and_return(true)
x.stub!(:hash).and_return(42)
y = mock('y')
y.should_not_receive(:eql?)
y.stub!(:hash).and_return(42)
map = ObjectSpace::WeakKeyMap.new
map[y] = 1
map[x].should == 1
end
it "finds a value via an identical key even when its #eql? isn't reflexive" do
x = mock('x')
x.should_receive(:hash).at_least(1).and_return(42)
x.stub!(:eql?).and_return(false) # Stubbed for clarity and latitude in implementation; not actually sent by MRI.
map = ObjectSpace::WeakKeyMap.new
map[x] = :x
map[x].should == :x
end
it "supports keys with private #hash method" do
key = WeakKeyMapSpecs::KeyWithPrivateHash.new
map = ObjectSpace::WeakKeyMap.new
map[key] = 42
map[key].should == 42
end
it "returns nil and does not raise error when a key cannot be garbage collected" do
map = ObjectSpace::WeakKeyMap.new
map[1].should == nil
map[1.0].should == nil
map[:a].should == nil
map[true].should == nil
map[false].should == nil
map[nil].should == nil
end
end
end
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