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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe PerformanceMonitoring::PrometheusMetric do
let(:json_content) do
{
"id" => "metric_of_ages",
"unit" => "count",
"label" => "Metric of Ages",
"query_range" => "http_requests_total"
}
end
describe '.from_json' do
subject { described_class.from_json(json_content) }
it 'creates a PrometheusMetric object' do
expect(subject).to be_a PerformanceMonitoring::PrometheusMetric
expect(subject.id).to eq(json_content['id'])
expect(subject.unit).to eq(json_content['unit'])
expect(subject.label).to eq(json_content['label'])
expect(subject.query_range).to eq(json_content['query_range'])
end
describe 'validations' do
context 'json_content is not a hash' do
let(:json_content) { nil }
subject { described_class.from_json(json_content) }
it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
end
context 'when unit is missing' do
before do
json_content['unit'] = nil
end
subject { described_class.from_json(json_content) }
it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
end
context 'when query and query_range is missing' do
before do
json_content['query_range'] = nil
end
subject { described_class.from_json(json_content) }
it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
end
context 'when query_range is missing but query is available' do
before do
json_content['query_range'] = nil
json_content['query'] = 'http_requests_total'
end
subject { described_class.from_json(json_content) }
it { is_expected.to be_valid }
end
end
end
end
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