Possible partial delete

go

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package scrapers

import (
	"testing"

	"github.com/prometheus/client_golang/prometheus"
	"github.com/stretchr/testify/assert"
)

const (
	ipAddress  = "192.168.10.1"
	minerSN    = "1234567890"
	macAddress = "00:00:00:00:00:00"
	epsilon    = 1e-5
)

func TestRegistryResetWorks(t *testing.T) {
	registry := prometheus.NewRegistry()
	mc := NewWhatsminerMetricCollection(registry)

	labels := prometheus.Labels{
		LabelIPAddress:  ipAddress,
		LabelMinerSN:    minerSN,
		LabelMACAddress: macAddress,
	}

	const hashRate = 100

	mc.RTHashRateGauge.With(labels).Set(hashRate)

	metrics, err := registry.Gather()
	assert.NoError(t, err)
	assert.Equal(t, 1, len(metrics))
	assert.Equal(t, "whatsminer_hash_realtime", metrics[0].GetName())
	assert.InEpsilon(t, hashRate, metrics[0].GetMetric()[0].GetGauge().GetValue(), epsilon)

	mc.RTHashRateGauge.DeletePartialMatch(prometheus.Labels{
		LabelIPAddress: ipAddress,
	})

	metrics, err = registry.Gather()
	assert.NoError(t, err)
	assert.Equal(t, 0, len(metrics))
}