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require 'spec_helper'
describe Mongo::ServerSelector::Primary do
let(:name) { :primary }
include_context 'server selector'
it_behaves_like 'a server selector mode' do
let(:slave_ok) { false }
end
it_behaves_like 'a server selector with sensitive data in its options'
describe '#initialize' do
context 'when max_staleness is provided' do
let(:options) do
{ max_staleness: 100 }
end
it 'raises an exception' do
expect {
selector
}.to raise_exception(Mongo::Error::InvalidServerPreference)
end
end
end
describe '#tag_sets' do
context 'tags not provided' do
it 'returns an empty array' do
expect(selector.tag_sets).to be_empty
end
end
context 'tag sets provided' do
let(:tag_sets) do
[ tag_set ]
end
it 'raises an error' do
expect {
selector.tag_sets
}.to raise_error(Mongo::Error::InvalidServerPreference)
end
end
end
describe '#to_mongos' do
it 'returns nil' do
expect(selector.to_mongos).to be_nil
end
context 'max staleness not provided' do
it 'returns nil' do
expect(selector.to_mongos).to be_nil
end
end
context 'max staleness provided' do
let(:max_staleness) do
100
end
it 'raises an error' do
expect {
selector
}.to raise_exception(Mongo::Error::InvalidServerPreference)
end
end
end
describe '#select' do
context 'no candidates' do
let(:candidates) { [] }
it 'returns an empty array' do
expect(selector.send(:select, candidates)).to be_empty
end
end
context 'secondary candidates' do
let(:candidates) { [secondary] }
it 'returns an empty array' do
expect(selector.send(:select, candidates)).to be_empty
end
end
context 'primary candidate' do
let(:candidates) { [primary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq([primary])
end
end
context 'primary and secondary candidates' do
let(:candidates) { [secondary, primary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq([primary])
end
end
context 'high latency candidates' do
let(:far_primary) { make_server(:primary, :average_round_trip_time => 0.100, address: default_address) }
let(:far_secondary) { make_server(:secondary, :average_round_trip_time => 0.120, address: default_address) }
context 'single candidate' do
context 'far primary' do
let(:candidates) { [far_primary] }
it 'returns array with the primary' do
expect(selector.send(:select, candidates)).to eq([far_primary])
end
end
context 'far secondary' do
let(:candidates) { [far_secondary] }
it 'returns empty array' do
expect(selector.send(:select, candidates)).to be_empty
end
end
end
context 'multiple candidates' do
context 'far primary, far secondary' do
let(:candidates) { [far_primary, far_secondary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq([far_primary])
end
end
context 'far primary, local secondary' do
let(:candidates) { [far_primary, far_secondary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq([far_primary])
end
end
end
end
end
end
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