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# encoding: UTF-8
require 'prometheus/client/label_set_validator'
describe Prometheus::Client::LabelSetValidator do
let(:validator) { Prometheus::Client::LabelSetValidator.new reserved_labels }
let(:reserved_labels) { [] }
describe '.new' do
it 'returns an instance of a LabelSetValidator' do
expect(validator).to be_a(Prometheus::Client::LabelSetValidator)
end
end
describe '#valid?' do
it 'returns true for a valid label check' do
expect(validator.valid?(version: 'alpha')).to eql(true)
end
it 'raises InvalidLabelError if a label value is an array' do
expect do
validator.valid?(version: [1, 2, 3])
end.to raise_exception(described_class::InvalidLabelError)
end
it 'raises Invaliddescribed_classError if a label set is not a hash' do
expect do
validator.valid?('invalid')
end.to raise_exception(described_class::InvalidLabelSetError)
end
it 'raises InvalidLabelError if a label key is not a symbol' do
expect do
validator.valid?('key' => 'value')
end.to raise_exception(described_class::InvalidLabelError)
end
it 'raises InvalidLabelError if a label key starts with __' do
expect do
validator.valid?(__reserved__: 'key')
end.to raise_exception(described_class::ReservedLabelError)
end
context "when reserved labels were set" do
let(:reserved_labels) { [:reserved] }
it 'raises ReservedLabelError if a label key is reserved' do
reserved_labels.each do |label|
expect do
validator.valid?(label => 'value')
end.to raise_exception(described_class::ReservedLabelError)
end
end
end
end
describe '#validate' do
it 'returns a given valid label set' do
hash = { version: 'alpha' }
expect(validator.validate(hash)).to eql(hash)
end
it 'raises an exception if a given label set is not valid' do
input = 'broken'
expect(validator).to receive(:valid?).with(input).and_raise(described_class::InvalidLabelSetError)
expect { validator.validate(input) }.to raise_exception(described_class::InvalidLabelSetError)
end
it 'raises InvalidLabelSetError for varying label sets' do
validator.validate(method: 'get', code: '200')
expect do
validator.validate(method: 'get', exception: 'NoMethodError')
end.to raise_exception(described_class::InvalidLabelSetError, "labels must have the same signature: (expected keys: [:code, :method], got: [:exception, :method])")
end
end
end
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