metrics/prometheus_test.v

module metrics

fn test_only_counters() {
	mut m := new_default_collector()
	m.counter_increment(name: 'test')

	mut e := new_prometheus_exporter()
	e.load('hi_', m)

	assert e.export_to_string()! == 'hi_test 1\n'

	metric := Metric{
		name: 'test2'
		labels: [['hi', 'label']!, ['hi2', 'label2']!]
	}
	m.counter_increment(metric)
	m.counter_increment(metric)

	assert e.export_to_string()! == 'hi_test 1\nhi_test2{hi="label",hi2="label2"} 2\n'
}

fn test_only_gauges() {
	mut m := new_default_collector()
	m.gauge_set(3.25, name: 'test')

	mut e := new_prometheus_exporter()
	e.load('hi_', m)

	assert e.export_to_string()! == 'hi_test 3.25\n'

	metric := Metric{
		name: 'test2'
		labels: [['hi', 'label']!, ['hi2', 'label2']!]
	}
	m.gauge_add(2.5, metric)

	assert e.export_to_string()! == 'hi_test 3.25\nhi_test2{hi="label",hi2="label2"} 2.5\n'
}

fn test_single_histogram() {
	mut m := new_default_collector()

    m.histogram_buckets_set('test', [0.5, 5.0])
	m.histogram_record(5.0, name: 'test')
	m.histogram_record(7.0, name: 'test')

	mut e := new_prometheus_exporter()
	e.load('hi_', m)

	assert e.export_to_string()! == 'hi_test_count 2\nhi_test_sum 12.0\nhi_test_bucket{le="0.5"} 0\nhi_test_bucket{le="5.0"} 1\nhi_test_bucket{le="+Inf"} 2\n'
}