/
atomic_fixnum_spec.rb
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/
atomic_fixnum_spec.rb
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RSpec.shared_examples :atomic_fixnum do
context 'construction' do
it 'sets the initial value' do
expect(described_class.new(10).value).to eq 10
end
it 'defaults the initial value to zero' do
expect(described_class.new.value).to eq 0
end
it 'raises an exception if the initial value is not a Fixnum' do
expect {
described_class.new(10.01)
}.to raise_error
end
end
context '#value' do
it 'returns the current value' do
counter = described_class.new(10)
expect(counter.value).to eq 10
counter.increment
expect(counter.value).to eq 11
counter.decrement
expect(counter.value).to eq 10
end
end
context '#value=' do
it 'sets the #value to the given `Fixnum`' do
atomic = described_class.new(0)
atomic.value = 10
expect(atomic.value).to eq 10
end
it 'returns the new value' do
atomic = described_class.new(0)
expect(atomic.value = 10).to eq 10
end
it 'raises and exception if the value is not a `Fixnum`' do
atomic = described_class.new(0)
expect {
atomic.value = 'foo'
}.to raise_error
end
end
context '#increment' do
it 'increases the value by one when no argument is given' do
counter = described_class.new(10)
3.times{ counter.increment }
expect(counter.value).to eq 13
end
it 'returns the new value when no argument is given' do
counter = described_class.new(10)
expect(counter.increment).to eq 11
end
it 'increases the value by the given argument' do
counter = described_class.new(10)
counter.increment(5)
expect(counter.value).to eq 15
end
it 'returns the new value the given argument' do
counter = described_class.new(10)
expect(counter.increment(5)).to eq 15
end
it 'is aliased as #up' do
expect(described_class.new(10).up).to eq 11
end
end
context '#decrement' do
it 'decreases the value by one when no argument is given' do
counter = described_class.new(10)
3.times{ counter.decrement }
expect(counter.value).to eq 7
end
it 'returns the new value when no argument is given' do
counter = described_class.new(10)
expect(counter.decrement).to eq 9
end
it 'decreases the value by the given argument' do
counter = described_class.new(10)
counter.decrement(5)
expect(counter.value).to eq 5
end
it 'returns the new value the given argument' do
counter = described_class.new(10)
expect(counter.decrement(5)).to eq 5
end
it 'is aliased as #down' do
expect(described_class.new(10).down).to eq 9
end
end
context '#compare_and_set' do
it 'returns false if the value is not found' do
expect(described_class.new(14).compare_and_set(2, 14)).to eq false
end
it 'returns true if the value is found' do
expect(described_class.new(14).compare_and_set(14, 2)).to eq true
end
it 'sets if the value is found' do
f = described_class.new(14)
f.compare_and_set(14, 2)
expect(f.value).to eq 2
end
it 'does not set if the value is not found' do
f = described_class.new(14)
f.compare_and_set(2, 12)
expect(f.value).to eq 14
end
end
context '#update' do
it 'passes the current value to the block' do
atomic = described_class.new(1000)
atomic.update { |v| (expect(v).to eq 1000); 1 }
end
it 'atomically sets the value to the return value from the block' do
atomic = described_class.new(1000)
atomic.update { |v| v + 1 }
expect(atomic.value).to eq 1001
end
it 'returns the new value' do
atomic = described_class.new(1000)
expect(atomic.update { |v| v + 1 }).to eq 1001
end
end
end
module Concurrent
RSpec.describe MutexAtomicFixnum do
it_should_behave_like :atomic_fixnum
context 'construction' do
it 'raises an exception if the initial value is too big' do
expect {
described_class.new(described_class::MAX_VALUE + 1)
}.to raise_error
end
it 'raises an exception if the initial value is too small' do
expect {
described_class.new(described_class::MIN_VALUE - 1)
}.to raise_error
end
end
context 'instance methods' do
before(:each) do
expect(subject).to receive(:synchronize).with(no_args).and_call_original
end
specify 'value is synchronized' do
subject.value
end
specify 'value= is synchronized' do
subject.value = 10
end
specify 'increment is synchronized' do
subject.increment
end
specify 'decrement is synchronized' do
subject.decrement
end
specify 'compare_and_set is synchronized' do
subject.compare_and_set(14, 2)
end
end
end
if defined? Concurrent::CAtomicFixnum
RSpec.describe CAtomicFixnum, ext: true do
it_should_behave_like :atomic_fixnum
end
end
if Concurrent.on_jruby?
RSpec.describe JavaAtomicFixnum do
it_should_behave_like :atomic_fixnum
end
end
RSpec.describe AtomicFixnum do
if RUBY_ENGINE != 'ruby'
it 'does not load the C extension' do
expect(defined?(Concurrent::CAtomicFixnum)).to be_falsey
end
end
if Concurrent.on_jruby?
it 'inherits from JavaAtomicFixnum' do
expect(AtomicFixnum.ancestors).to include(JavaAtomicFixnum)
end
elsif defined? Concurrent::CAtomicFixnum
it 'inherits from CAtomicFixnum', ext: true do
expect(AtomicFixnum.ancestors).to include(CAtomicFixnum)
end
else
it 'inherits from MutexAtomicFixnum' do
expect(AtomicFixnum.ancestors).to include(MutexAtomicFixnum)
end
end
describe '#to_s and #inspect' do
it 'includes the value' do
subject = described_class.new(42)
expect(subject.to_s).to include('42')
expect(subject.inspect).to include('42')
end
end
end
end