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volatile_lock_test.rb
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volatile_lock_test.rb
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require 'test_helper'
require 'volatile_lock'
class VolatileLockTest < ActiveSupport::TestCase
def teardown
redis.del('foo', 'bar')
end
def redis
RedisClient.instance.connection
end
def volatile_lock(key, expiration_time = 1.second)
VolatileLock.new(key, expiration_time)
end
test "starts by deleting possibly stale locks created by the same host" do
redis.set('foo', Socket.gethostname)
assert volatile_lock('foo').obtained?
end
test "ensures only one lock is obtained per key across hosts" do
Socket.stubs(:gethostname).returns('pluto')
assert volatile_lock('foo').obtained?
Socket.stubs(:gethostname).returns('mars')
refute volatile_lock('foo').obtained?
end
test "allows multiple locks to be obtained if keys differ" do
assert volatile_lock('foo').obtained?
assert volatile_lock('bar').obtained?
end
test "allows expiration_time to be changed" do
redis = mock(get: nil, setnx: true)
redis.expects(:expire).with('foo', 30.seconds).returns(true)
VolatileLock.any_instance.stubs(:redis).returns(redis)
volatile_lock('foo', 30.seconds).obtained?
end
context "failing to set expiration time" do
should "raise FailedToSetExpiration" do
redis = mock(get: nil, setnx: true, del: true, expire: false)
VolatileLock.any_instance.stubs(:redis).returns(redis)
assert_raises(VolatileLock::FailedToSetExpiration) { volatile_lock('foo').obtained? }
end
should "delete the persisted key" do
redis = mock(get: nil, setnx: true, expire: false)
redis.expects(:del).with('foo')
VolatileLock.any_instance.stubs(:redis).returns(redis)
volatile_lock('foo').obtained? rescue VolatileLock::FailedToSetExpiration
end
end
end