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# frozen_string_literal: true
require 'spec_helper'
describe Postgresql::ReplicationSlot, :postgresql do
describe '.in_use?' do
it 'returns true when replication slots are present' do
expect(described_class).to receive(:exists?).and_return(true)
expect(described_class.in_use?).to be_truthy
end
it 'returns false when replication slots are not present' do
expect(described_class.in_use?).to be_falsey
end
it 'returns false if the existence check is invalid' do
expect(described_class).to receive(:exists?).and_raise(ActiveRecord::StatementInvalid.new('PG::FeatureNotSupported'))
expect(described_class.in_use?).to be_falsey
end
end
describe '.lag_too_great?' do
before do
expect(described_class).to receive(:in_use?).and_return(true)
end
it 'returns true when replication lag is too great' do
expect(described_class)
.to receive(:pluck)
.and_return([125.megabytes])
expect(described_class.lag_too_great?).to eq(true)
end
it 'returns false when more than one replicas is up to date enough' do
expect(described_class)
.to receive(:pluck)
.and_return([125.megabytes, 0.megabytes, 0.megabytes])
expect(described_class.lag_too_great?).to eq(false)
end
it 'returns false when replication lag is not too great' do
expect(described_class)
.to receive(:pluck)
.and_return([0.megabytes])
expect(described_class.lag_too_great?).to eq(false)
end
end
end
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