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shared_examples :store do
it 'writes values to keys that like a Hash' do
moneta_property_of(keys: 1, values: 1).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[0]].should == m.values[0]
store.load(m.keys[0]).should == m.values[0]
end
end
it 'returns true from #key? if a key is available' do
moneta_property_of(keys: 1, values: 1).check do |m|
store[m.keys[0]] = m.values[0]
store.key?(m.keys[0]).should be true
end
end
it 'stores values with #store' do
moneta_property_of(keys: 1, values: 1).check do |m|
value = m.values[0]
store.store(m.keys[0], value).should equal(value)
store[m.keys[0]].should == m.values[0]
store.load(m.keys[0]).should == m.values[0]
end
end
it 'stores values after clear' do
moneta_property_of(keys: 2, values: 2).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[1]] = m.values[1]
store.clear.should equal(store)
store[m.keys[0]] = m.values[0]
store[m.keys[0]].should == m.values[0]
store[m.keys[1]].should be_nil
end
end
it 'removes and returns a value from the backing store via delete if it exists' do
moneta_property_of(keys: 1, values: 1).check do |m|
store[m.keys[0]] = m.values[0]
store.delete(m.keys[0]).should == m.values[0]
store.key?(m.keys[0]).should be false
end
end
it 'overwrites existing values' do
moneta_property_of(keys: 1, values: 2).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[0]].should == m.values[0]
store[m.keys[0]] = m.values[1]
store[m.keys[0]].should == m.values[1]
end
end
it 'stores frozen values' do
moneta_property_of(keys: 1, values: 1).check do |m|
value = m.values[0].freeze
(store[m.keys[0]] = value).should equal(value)
store[m.keys[0]].should == m.values[0]
end
end
it 'stores frozen keys' do
moneta_property_of(keys: 1, values: 1).check do |m|
key = m.keys[0].freeze
store[key] = m.values[0]
store[m.keys[0]].should == m.values[0]
end
end
it 'fetches a key with a default value with fetch, if the key is available' do
moneta_property_of(keys: 1, values: 2).check do |m|
next if m.values[0].nil?
store[m.keys[0]] = m.values[0]
store.fetch(m.keys[0], m.values[1]).should == m.values[0]
end
end
it 'does not run the block in fetch if the key is available' do
moneta_property_of(keys: 1, values: 1).check do |m|
next if m.values[0].nil?
store[m.keys[0]] = m.values[0]
unaltered = 'unaltered'
store.fetch(m.keys[0]) { unaltered = 'altered' }
unaltered.should == 'unaltered'
end
end
shared_examples :values_at do |name|
it 'retrieves stored values' do
moneta_property_of(keys: 3, values: 3).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[1]] = m.values[1]
store[m.keys[2]] = m.values[2]
expect(store.public_send(name, m.keys[1], m.keys[2], m.keys[0])).to eq [m.values[1], m.values[2], m.values[0]]
store.clear
end
end
it 'returns nil in place of missing values' do
moneta_property_of(keys: 3, values: 2).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[1]] = m.values[1]
expect(store.public_send(name, m.keys[1], m.keys[2], m.keys[0])).to eq [m.values[1], nil, m.values[0]]
store.clear
end
end
end
describe '#values_at' do
include_examples :values_at, :values_at
end
describe '#fetch_values' do
include_examples :values_at, :fetch_values
it 'yields to the block, if given, for keys that are not in the store' do
moneta_property_of(keys: 4, values: 3).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[1]] = m.values[1]
store[m.keys[2]] = m.values[2]
expect do |b|
store.fetch_values(m.keys[0], m.keys[1], m.keys[2], m.keys[3], &b)
end.to yield_with_args(m.keys[3])
store.clear
end
end
it 'uses the value of the block, if given, for keys that are not in the store' do
moneta_property_of(keys: 4, values: 4).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[1]] = m.values[1]
store[m.keys[2]] = m.values[2]
expect(store.fetch_values(m.keys[0], m.keys[1], m.keys[2], m.keys[3]) do |key|
expect(key).to eq m.keys[3]
m.values[3]
end).to eq [m.values[0], m.values[1], m.values[2], m.values[3]]
store.clear
end
end
it 'raises any error raised in the block' do
expect { store.fetch_values('key') { raise 'yarg' } }.to raise_error 'yarg'
end
end
describe '#slice' do
it 'returns pairs of stored keys and values' do
moneta_property_of(keys: 3, values: 3).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[1]] = m.values[1]
store[m.keys[2]] = m.values[2]
expect(store.slice(*[m.keys[0], m.keys[1], m.keys[2]].shuffle).to_a).to \
contain_exactly([m.keys[0], m.values[0]], [m.keys[1], m.values[1]], [m.keys[2], m.values[2]])
store.clear
end
end
it 'does not return pairs for any keys absent from the store' do
moneta_property_of(keys: 4, values: 3).check do |m|
store[m.keys[0]] = m.values[0]
store[m.keys[1]] = m.values[1]
store[m.keys[2]] = m.values[2]
expect(store.slice(*[m.keys[0], m.keys[1], m.keys[2], m.keys[3]].shuffle).to_a).to \
contain_exactly([m.keys[0], m.values[0]], [m.keys[1], m.values[1]], [m.keys[2], m.values[2]])
store.clear
end
end
end
shared_examples :merge! do
it 'can be called with an empty object' do
expect { store.public_send(method, pairs.call({})) }.not_to raise_error
end
it 'stores values' do
moneta_property_of(keys: 3, values: 3).check do |m|
expect(store.public_send(method, pairs.call({ m.keys[0] => m.values[0], m.keys[1] => m.values[1], m.keys[2] => m.values[2] }))).to be store
expect(store.key?(m.keys[0])).to be true
expect(store[m.keys[0]]).to eq m.values[0]
expect(store.key?(m.keys[1])).to be true
expect(store[m.keys[1]]).to eq m.values[1]
expect(store.key?(m.keys[2])).to be true
expect(store[m.keys[2]]).to eq m.values[2]
store.clear
end
end
it 'overwrites existing values' do
moneta_property_of(keys: 2, values: 3).check do |m|
expect(store[m.keys[0]] = m.values[0]).to eq m.values[0]
expect(store.public_send(method, pairs.call({ m.keys[0] => m.values[1], m.keys[1] => m.values[2] }))).to be store
expect(store.key?(m.keys[0])).to be true
expect(store[m.keys[0]]).to eq m.values[1]
expect(store.key?(m.keys[1])).to be true
expect(store[m.keys[1]]).to eq m.values[2]
store.clear
end
end
it 'stores the return value of the block, if given, for keys that will be overwritten' do
moneta_property_of(keys: 2, values: 4).check do |m|
expect(store[m.keys[0]] = m.values[0]).to eq m.values[0]
expect(store.public_send(method, pairs.call({ m.keys[0] => m.values[1], m.keys[1] => m.values[2] })) do |key, old_val, new_val|
expect(key).to eq m.keys[0]
expect(old_val).to eq m.values[0]
expect(new_val).to eq m.values[1]
m.values[3]
end).to be store
expect(store.key?(m.keys[0])).to be true
expect(store[m.keys[0]]).to eq m.values[3]
expect(store.key?(m.keys[1])).to be true
expect(store[m.keys[1]]).to eq m.values[2]
store.clear
end
end
it 'raises any error raised in the block' do
store['x'] = 'y'
expect { store.public_send(method, 'x' => 'v') { raise 'yarg' } }.to raise_error 'yarg'
end
end
shared_examples :merge_or_update do
context 'when passed a hash' do
let(:pairs) { :itself.to_proc }
include_examples :merge!
end
context 'when passed an array' do
let(:pairs) { :to_a.to_proc }
include_examples :merge!
end
context 'when passed a lazy enumerator' do
let :pairs do
lambda do |hash|
Enumerator.new do |y|
hash.each(&y.method(:<<))
end.lazy
end
end
include_examples :merge!
end
end
describe '#merge!' do
let(:method) { :merge! }
include_examples :merge_or_update
end
describe '#update' do
let(:method) { :update }
include_examples :merge_or_update
end
end
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