1 files changed, 182 insertions, 0 deletions
diff --git a/vendor/github.com/prometheus/client_golang/prometheus/gauge_test.go b/vendor/github.com/prometheus/client_golang/prometheus/gauge_test.go
new file mode 100644
index 000000000..48cab4636
--- /dev/null
+++ b/vendor/github.com/prometheus/client_golang/prometheus/gauge_test.go
@@ -0,0 +1,182 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package prometheus
+
+import (
+	"math"
+	"math/rand"
+	"sync"
+	"testing"
+	"testing/quick"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+func listenGaugeStream(vals, result chan float64, done chan struct{}) {
+	var sum float64
+outer:
+	for {
+		select {
+		case <-done:
+			close(vals)
+			for v := range vals {
+				sum += v
+			}
+			break outer
+		case v := <-vals:
+			sum += v
+		}
+	}
+	result <- sum
+	close(result)
+}
+
+func TestGaugeConcurrency(t *testing.T) {
+	it := func(n uint32) bool {
+		mutations := int(n % 10000)
+		concLevel := int(n%15 + 1)
+
+		var start, end sync.WaitGroup
+		start.Add(1)
+		end.Add(concLevel)
+
+		sStream := make(chan float64, mutations*concLevel)
+		result := make(chan float64)
+		done := make(chan struct{})
+
+		go listenGaugeStream(sStream, result, done)
+		go func() {
+			end.Wait()
+			close(done)
+		}()
+
+		gge := NewGauge(GaugeOpts{
+			Name: "test_gauge",
+			Help: "no help can be found here",
+		})
+		for i := 0; i < concLevel; i++ {
+			vals := make([]float64, mutations)
+			for j := 0; j < mutations; j++ {
+				vals[j] = rand.Float64() - 0.5
+			}
+
+			go func(vals []float64) {
+				start.Wait()
+				for _, v := range vals {
+					sStream <- v
+					gge.Add(v)
+				}
+				end.Done()
+			}(vals)
+		}
+		start.Done()
+
+		if expected, got := <-result, math.Float64frombits(gge.(*value).valBits); math.Abs(expected-got) > 0.000001 {
+			t.Fatalf("expected approx. %f, got %f", expected, got)
+			return false
+		}
+		return true
+	}
+
+	if err := quick.Check(it, nil); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestGaugeVecConcurrency(t *testing.T) {
+	it := func(n uint32) bool {
+		mutations := int(n % 10000)
+		concLevel := int(n%15 + 1)
+		vecLength := int(n%5 + 1)
+
+		var start, end sync.WaitGroup
+		start.Add(1)
+		end.Add(concLevel)
+
+		sStreams := make([]chan float64, vecLength)
+		results := make([]chan float64, vecLength)
+		done := make(chan struct{})
+
+		for i := 0; i < vecLength; i++ {
+			sStreams[i] = make(chan float64, mutations*concLevel)
+			results[i] = make(chan float64)
+			go listenGaugeStream(sStreams[i], results[i], done)
+		}
+
+		go func() {
+			end.Wait()
+			close(done)
+		}()
+
+		gge := NewGaugeVec(
+			GaugeOpts{
+				Name: "test_gauge",
+				Help: "no help can be found here",
+			},
+			[]string{"label"},
+		)
+		for i := 0; i < concLevel; i++ {
+			vals := make([]float64, mutations)
+			pick := make([]int, mutations)
+			for j := 0; j < mutations; j++ {
+				vals[j] = rand.Float64() - 0.5
+				pick[j] = rand.Intn(vecLength)
+			}
+
+			go func(vals []float64) {
+				start.Wait()
+				for i, v := range vals {
+					sStreams[pick[i]] <- v
+					gge.WithLabelValues(string('A' + pick[i])).Add(v)
+				}
+				end.Done()
+			}(vals)
+		}
+		start.Done()
+
+		for i := range sStreams {
+			if expected, got := <-results[i], math.Float64frombits(gge.WithLabelValues(string('A'+i)).(*value).valBits); math.Abs(expected-got) > 0.000001 {
+				t.Fatalf("expected approx. %f, got %f", expected, got)
+				return false
+			}
+		}
+		return true
+	}
+
+	if err := quick.Check(it, nil); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestGaugeFunc(t *testing.T) {
+	gf := NewGaugeFunc(
+		GaugeOpts{
+			Name:        "test_name",
+			Help:        "test help",
+			ConstLabels: Labels{"a": "1", "b": "2"},
+		},
+		func() float64 { return 3.1415 },
+	)
+
+	if expected, got := `Desc{fqName: "test_name", help: "test help", constLabels: {a="1",b="2"}, variableLabels: []}`, gf.Desc().String(); expected != got {
+		t.Errorf("expected %q, got %q", expected, got)
+	}
+
+	m := &dto.Metric{}
+	gf.Write(m)
+
+	if expected, got := `label:<name:"a" value:"1" > label:<name:"b" value:"2" > gauge:<value:3.1415 > `, m.String(); expected != got {
+		t.Errorf("expected %q, got %q", expected, got)
+	}
+}