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require 'spec_helper'
shared_examples 'a reference key map' do
let(:value_1) { 'value 1' }
let(:value_2) { 'value 2' }
let(:value_3) { 'value 3' }
let(:key_1) { Object.new }
let(:key_2) { Object.new }
let(:key_3) { Object.new }
let(:hash) { map_class.new }
context 'keeps entries with strong references' do
specify do
Ref::Mock.use do
hash[key_1] = "value 1"
hash[key_2] = "value 2"
expect(hash[key_1]).to eq "value 1"
expect(hash[key_2]).to eq "value 2"
end
end
end
context 'removes entries that have been garbage collected' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
expect(hash[key_1]).to eq(value_1)
expect(hash[key_2]).to eq(value_2)
Ref::Mock.gc(key_2)
expect(hash[key_1]).to eq(value_1)
expect(hash[key_2]).to be_nil
end
end
end
context 'can clear the map' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
hash.clear
expect(hash[key_1]).to be_nil
expect(hash[key_2]).to be_nil
end
end
end
context 'can delete entries' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
Ref::Mock.gc(key_2)
expect(hash.delete(key_2)).to be_nil
expect(hash.delete(key_1)).to eq(value_1)
expect(hash[key_1]).to be_nil
end
end
end
context 'can merge in another hash' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
hash.merge!(key_3 => value_3)
expect(hash[key_2]).to eq 'value 2'
expect(hash[key_1]).to eq value_1
Ref::Mock.gc(key_2)
expect(hash[key_2]).to be_nil
expect(hash[key_1]).to eq value_1
expect(hash[key_3]).to eq value_3
end
end
end
context 'can get all keys' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
hash[key_3] = value_3
expect([key_1, key_2, key_3] - hash.keys).to eq []
Ref::Mock.gc(key_2)
expect([key_1, key_2, key_3] - hash.keys).to eq [key_2]
end
end
end
context 'can turn into an array' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
hash[key_3] = value_3
order = lambda{|a,b| a.last <=> b.last}
expect([[key_1, "value 1"], [key_2, "value 2"], [key_3, "value 3"]].sort(&order)).to eq hash.to_a.sort(&order)
Ref::Mock.gc(key_2)
expect([[key_1, "value 1"], [key_3, "value 3"]].sort(&order)).to eq hash.to_a.sort(&order)
end
end
end
context 'can turn into a hash' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
hash[key_3] = value_3
order = lambda{|a,b| a.last <=> b.last}
expect({key_1 => "value 1", key_2 => "value 2", key_3 => "value 3"}.sort(&order)).to eq hash.to_h.sort(&order)
Ref::Mock.gc(key_2)
expect({key_1 => "value 1", key_3 => "value 3"}.sort(&order)).to eq hash.to_h.sort(&order)
end
end
end
context 'can interate over all entries' do
specify do
Ref::Mock.use do
hash[key_1] = value_1
hash[key_2] = value_2
hash[key_3] = value_3
keys = []
values = []
hash.each{|k,v| keys << k; values << v}
expect([key_1, key_2, key_3] - keys).to eq []
expect(["value 1", "value 2", "value 3"]).to eq values.sort
Ref::Mock.gc(key_2)
keys = []
values = []
hash.each{|k,v| keys << k; values << v}
expect([key_1, key_2, key_3] - keys).to eq [key_2]
expect(["value 1", "value 3"]).to eq values.sort
end
end
end
context 'size' do
specify do
Ref::Mock.use do
hash = map_class.new
expect(hash.empty?).to eq true
expect(hash.size).to eq 0
key_1 = Object.new
key_2 = Object.new
hash[key_1] = "value 1"
hash[key_2] = "value 2"
expect(hash.size).to eq 2
Ref::Mock.gc(key_2)
expect(hash.empty?).to eq false
expect(hash.size).to eq 1
end
end
end
context 'inspect' do
specify do
Ref::Mock.use do
hash[Object.new] = "value 1"
expect(hash.inspect).to_not be_nil
end
end
end
context '#merge' do
let(:new_value){ Object.new }
let(:values){ {key_1 => value_1, key_2 => value_2, key_3 => value_3} }
let(:this) do
values.each{|k, v| hash[k] = v }
hash
end
let(:other){ {key_3 => new_value} }
it 'updates all members with the new values from a given hash' do
expect(this.merge(other)[key_3]).to eq new_value
end
it 'calls the given block for each key in `other`' do
actual = 0
this.merge(key_2 => 'yes', key_3 => 'no'){|member, thisval, otherval| actual += 1; Object.new }
expect(actual).to eq 2
end
it 'retains the value for all members without values in the given hash' do
expect(this.merge(other)[key_1]).to eq value_1
end
it 'adds members not in the original hash' do
new_key = Object.new
new_value = 'life, the universe, and everything'
expect(this.merge(new_key => new_value)[new_key]).to eq new_value
end
it 'returns a deep copy when merging an empty hash' do
other = this.merge({})
values.each do |key, value|
expect(other[key]).to eq value
end
end
it 'returns a new object' do
expect(this.merge(other).object_id).to_not eq this.object_id
expect(this.merge(other).object_id).to_not eq other.object_id
end
end
end
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